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Article

Association Between Workplace Sedentary Behavior, Age, and Waist-to-Height Ratio in Spanish Male Workers: An Observational Study in a Large Occupational Cohort

by
Alejandro de Arriba Santos
1,
Gema Santamaría
2,*,
Raúl Cobreros Mielgo
1,
Luis M. Cacharro
3,
Álvaro López-Llorente
4,
Elena Jiménez-Callejo
5,
Jesús Seco-Calvo
1,6 and
Diego Fernández-Lázaro
7,8,*
1
Physiotherapy Department, Institute of Biomedicine (IBIOMED), University of Leon, Campus de Vegazana, 24071 Leon, Spain
2
Department of Anatomy and Radiology, Faculty of Health Sciences, Campus of Soria, University of Valladolid, 42003 Soria, Spain
3
Department of Ophthalmology of Salamanca University Assistance Complex (CAUSA), Salamanca University Hospital, 37007 Salamanca, Spain
4
Aranda Polyclinic Center, 09400 Aranda de Duero, Spain
5
Research Support Unit, Soria Healthcare Management, Soria University Healthcare Complex (CAUSO), Santa Bárbara Hospital, 42004 Soria, Spain
6
Department of Physiology, Faculty of Medicine, Basque Country University, 48900 Leioa, Spain
7
Histology Area, Department of Cell Biology, Genetics, Histology and Pharmacology, Faculty of Health Sciences, University of Valladolid, Campus de Soria, 42004 Soria, Spain
8
Neurobiology Research Group, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain
*
Authors to whom correspondence should be addressed.
Safety 2025, 11(4), 105; https://doi.org/10.3390/safety11040105
Submission received: 20 September 2025 / Revised: 28 October 2025 / Accepted: 30 October 2025 / Published: 4 November 2025
Browse Figure
Versions Notes

Abstract

Prolonged sitting (PS) in the workplace has been linked to a higher risk of developing non-communicable chronic diseases. Simultaneously, an elevated waist-to-height ratio (WHtR) is considered a reliable measure of increased risk for the same condition. The main objective of this research was to examine the relationship between workplace PS and increased WHtR among male workers from the Spanish region of Castilla y León. The secondary objective was to assess how age affects elevated WHtR in workers. This retrospective observational study was carried out in accordance with the STROBE guidelines. The sample included 85,670 male workers, categorized by job type (with or without PS) and age (<40 years or ≥40 years). Chi-square test (X2), Pearson correlation coefficients, and odd ratios (OR) were used to analyze associations. Among workers with PS, X2 = 0.73 (p = 0.391) and 1.11 (p = 0.292) were reported, and among those without PS, X2 = 0.86 (p = 0.354) and 1.24 (p = 0.265), for the years 2022 and 2023, respectively. Therefore, there was no significant association between workers with or without PS and an elevated WHtR, both in those younger than and older than 40 years of age. Advanced age (≥40 years) showed a significant association with increased WHtR (p < 0.01; OR = 2.6). However, no statistical association was observed between PS and elevated WHtR (p > 0.05; OR = 1.15). These findings suggest that age plays a more prominent role than occupational PS time in WHtR among male workers. Future studies should consider other factors, including physical activity and dietary habits, that could affect WHtR.

1. Introduction

Prolonged sitting (PS) is a common feature in numerous job positions, particularly in occupations that require the continuous use of display screen equipment or professional driving [1,2]. Occupational PS is defined as remaining seated for more than four consecutive hours during each workday [3]. In developed countries, it is estimated that, on average, an employee spends between 75% and 85% of their working day seated [4]. PS has been linked to an increased risk of manifesting chronic non-communicable conditions, including type 2 diabetes mellitus, arterial hypertension, obesity, dyslipidemias, and cardiovascular diseases [1,2,5]. The chronic diseases related to PS are connected to a greater risk of premature mortality [5]. Moreover, occupational PS has been associated with a poorer self-perception of health status among workers [6]. This link has aroused growing interest in incorporating the assessment and control of PS into official occupational health surveillance protocols [7,8]. These protocols are applied in the periodic health examinations carried out on workers with the aim of identifying specific risks associated with each job position [7,8].
One of the most commonly used anthropometric variables to assess cardiometabolic risk (CMR) is the waist-to-height ratio (WHtR) [9,10,11]. WHtR is obtained by dividing the waist circumference (cm) by the height (cm), and it is considered elevated when it exceeds the threshold value of 0.5 [12,13,14]. The use of WHtR has been recommended due to its simplicity, low cost, and greater reliability compared to other indicators, such as body mass index (BMI) [15,16,17]. Although BMI remains the most commonly applied indicator, it presents significant limitations. It does not distinguish the source of weight (whether fat or muscle), and does not allow differentiation between peripheral obesity and central obesity [16,18,19]. A study determined that 33.1% of men and 51.9% of women with a BMI within the normal range presented abdominal obesity or central obesity [20]. Moreover, individuals presenting central obesity but a normal BMI have been shown to face a greater risk of developing cardiometabolic conditions than those with elevated BMI yet without central obesity [20]. In this context, other more reliable indicators such as WHtR are emerging to assess central obesity [16]. Previous publications propose that an elevated WHtR correlates with an increased risk of disorders including type 2 diabetes, arterial hypertension, obesity, dyslipidemias, acute myocardial infarction, or ischemic stroke [21,22,23,24]. Thus, the WHtR is a better predictor than the BMI, especially because its better accounts for the health risks of central abdominal fat, even in people with a healthy BMI [24].
In this scenario, the working population becomes a particularly vulnerable group to the increase in WHtR, since, as mentioned above, a large part of their active hours are spent in sedentary occupations [1,25,26]. The World Health Organization (WHO) has emphasized the importance of physical activity in the workplace and recommends implementing measures aimed at reducing PS time [27]. Although the cardiometabolic risks associated with PS are well documented [28,29,30,31,32,33,34], specific evidence on its influence on WHtR remains limited. At the same time, adulthood has been recognized as a stage that significantly elevates CMR [35,36,37,38,39]. Specifically, it is necessary for Spanish male workers due to the high prevalence of obesity and associated health risks, such as metabolic syndrome, in this population. Understanding this relationship can help inform targeted public health interventions and workplace strategies to combat sedentary lifestyles, reduce health risks, and improve overall well-being in this specific group. The relationship between occupational sedentary behavior, age, and waist-to-height ratio is a key indicator for assessing health risk in this population. Understanding the interaction between age, occupational PS, and elevated WHtR is essential to guide preventive measures and design occupational health promotion strategies tailored to different age groups and types of job positions. This study aimed to assess the prevalence of elevated WHtR in male workers from the region of Castilla y León (Spain) performing tasks involving PS, compared with those in non-sedentary positions, during the years 2022 and 2023. As a secondary objective, the influence of age on the increase in WHtR was examined. The present research intends to establish the basis for future investigation and contribute to the design of effective health promotion interventions in the workplace.

2. Materials and Methods

2.1. Design

A retrospective observational study was carried out in accordance with “Strengthening the Reporting of Observational Studies in Epidemiology” (STROBE) guidelines (Appendix A) [40] The relationship between WHtR values, PS in the workplace, and age was analyzed in male workers. This study will focus specifically on male workers from the Spanish Autonomous Community of Castilla y León. Castilla y León is representative of the Spanish region located in the northwest of the Iberian Peninsula. Castilla y León is Spain’s largest region by area and one of the largest in the European Union, with a population of approximately 2.4 million inhabitants as of 2023. This region is administratively identified as the “Autonomous Community” of Castile and León by the Spanish government. This study was carried out in collaboration with Quirón Prevención, which provided the data from the health examinations conducted on its workers in 2022 and 2023.

2.2. Legal and Ethical Considerations

The Clinical Research Ethics Committee (CEIC) of the University of León, Spain approved this study (REF: ETICA-ULE-17-2022). All workers belonged to the mutual health insurance company “Quirón Prevención,” S.L.U. which is responsible for health assessments. For this reason, this study was also authorized by Director of the Occupational Health Area of “Quirón Prevención” S.L.U. on 4 October 2024. The study was conducted in accordance with the Declaration of Helsinki (2008) and its Fortaleza update (2013) [41]. All participants signed informed consent individually, which required the researchers to provide them with all relevant information in a clear and understandable manner before they agreed to participate in the study. This process, which must be voluntary and free of coercion, is an ethical and legal requirement to ensure that the participant makes an informed and autonomous decision about their participation.

2.3. Participants

The study participants were male workers aged 18–70 years. Recruitment was carried out in January 2025 using data from the 2022 and 2023 health examinations provided by Quirón Prevención. All employees had undergone a mandatory health assessment to determine their fitness for duty or to identify any health issues that could affect their work, thus ensuring compliance with the health and safety regulations of the Spanish Ministry of Labor. These health checks are standardized by Spanish law. Participants were included if (i) active workers ≥ 18 years; (ii) male; (iii) availability of information on age, job position, and WHtR. Participants were excluded if (i) they had musculoskeletal injuries that required job adaptations resulting in spending more hours seated; (ii) they did not provide informed consent.
Out of a total of 85,913 participants, 243 were excluded. A total of 127 subjects did not provide informed consent, 40 were under 18 years of age, and complete data on age, job position, and WHtR were not obtained for 76. The final sample consisted of 85,670 participants (Figure 1). Participants were categorized into two groups based on their job position: (i) workers with prolonged sitting (those whose job positions require remaining seated for more than four consecutive hours per day [3], such as display screen equipment workers and drivers [7,8]); (ii) other job positions (workers who remain seated for less than four consecutive hours per day). In parallel, participants were assigned to two groups according to age: workers under 40 years and workers aged 40 years or older (Figure 1). Age 40 was chosen as a logical categorization point for employee health, as it is an age at which the cumulative effects of a sedentary lifestyle become significant enough to substantially increase the risk of chronic disease [42,43,44]. Also, The choice of the age 40 cutoff is based on the international guidelines such as: USPSTF [45] and CTFPHC [46], which recommend including cardiometabolic risk assessment in periodic health examinations for healthy, active individuals starting at age 40.

2.4. Data Collection

Three researchers (A.A.S., G.S.G., and D.F.-L.) examined the health examinations provided by Quirón Prevención. The following information was extracted from each examination: age, job position, occupational risk protocols, abdominal circumference, and height (anthropometric measurements necessary to calculate WHtR). Height was measured with a stadiometer, and abdominal circumference with a measuring tape. All data was compiled in an Excel spreadsheet for subsequent statistical analysis.
The study’s independent variables were age (<40 years; ≥40 years) and type of job position (with PS; without PS). The dependent variable was WHtR, categorized as normal (≤0.5) and elevated (>0.5), according to the criteria established in previous studies [12,13,14].

2.5. Statistical Analysis

Data collected from the study participants were coded in Excel spreadsheets and then exported for analysis to the software “Statistical Package for Social Sciences” (SPSS) version 26.0 for Windows (IBM SPSS Statistics 2019). The characteristics of the sample were described using percentages. Associations between WHtR, age, and job position were assessed using the chi-square test and Pearson’s Correlation coefficient. The odds ratio was used to analyze whether having job positions with PS and older age (≥40 years) represented a risk factor for elevated WHtR. Results with p-values less than 0.05 were considered statistically significant.

3. Results

3.1. Sample Description

The data related to age, WHtR, and type of job position in the sample are presented in Table 1. The workers’ data were divided according to the years of collection, 2022 and 2023. Starting with 2022, 37.9% (n = 14,454) of the workers were under 40 years old. Elevated WHtR was observed in 32.8% (n = 4749) of workers under 40 years and in 62.5% (n = 14,837) of workers aged 40 years or older. Among workers with elevated WHtR, 22.4% (n = 1065) of those under 40 years and 23.8% (n = 3534) of those aged 40 years or older held job positions with PS. In 2023, 36.7% (n = 17,431) of the workers analyzed were under 40 years old. Elevated WHtR was found in 34.7% (n = 6047) of workers under 40 years and in 63.5% (n = 19,078) of those aged 40 years or older. Among workers under 40 years with elevated WHtR, 24.2% (n = 1464) held positions with PS, while in those aged 40 years or older the proportion was 25.1% (n = 4794).

3.2. Relationship Between Prolonged Sitting, Age, and Waist-to-Height Ratio

To determine if elevated WHtR was significantly associated with occupational PS, the chi-square test was applied (Table 2). In 2022, among workers with PS, the chi-square test showed a value of X2 = 0.73 (p = 0.391), and among those without PS, a value of X2 = 0.86 (p = 0.354). Similarly, in 2023, the X2 value was 1.11 (p = 0.292) for workers with PS and 1.24 (p = 0.265) for workers without PS. These results suggest no significant relationship between workers with or without PS and elevated WHtR, both in those under and over 40 years of age.
Alternatively, Pearson’s correlation coefficient (Table 3) revealed a strong positive association between age and WHtR in both 2022 (r = 0.62) and 2023 (r = 0.64). In contrast, the correlation between PS and WHtR was weakly positive, with values of r = 0.15 in 2022 and r = 0.17 in 2023. These results indicate that although both age and PS are associated with WHtR, the magnitude of the association is substantially greater for age.
To assess the effect of age and PS on the likelihood of presenting an elevated WHtR, a logistic regression analysis was performed (Table 4), allowing the association to be adjusted for potential confounding factors. The results showed that workers over 40 years had a significantly higher risk of having an elevated WHtR, with an OR of 2.5 in 2022 and 2.6 in 2023 (p < 0.01 in both periods). In contrast, PS was not significantly associated with elevated WHtR, showing an OR of 1.15 in 2022 (p = 0.42) and 1.18 in 2023 (p = 0.39). These findings indicate that age is a risk factor for elevated WHtR, whereas PS does not increase this probability.

4. Discussion

After analyzing 85,670 workers, it was observed that the presence of elevated WHtR is significantly associated (p < 0.01) with workers’ age, while no clear association was found between WHtR and PS in the workplace. These results suggest that, in the working population, age may have a greater influence on CMR than PS in the workplace.
With regard to age, the findings of this study are in agreement with previous research, which identifies aging as a key factor in the increase in visceral fat and CMR [35,37,38]. As age advances, physiological changes occur that favor the accumulation of abdominal fat. Among them, the progressive decrease in basal metabolic rate stands out, which is related to the loss of muscle mass and reduced efficiency in energy utilization [38]. The decrease in energy expenditure facilitates fat accumulation even without significant changes in lifestyle [49]. In parallel, with age adipose tissue is redistributed, resulting in a lower proportion of subcutaneous fat and a higher proportion of visceral fat [50,51,52,53]. While subcutaneous fat appears to exert a protective effect against type 2 diabetes mellitus, insulin resistance, and cardiovascular diseases, excess visceral fat significantly increases the risk of these conditions [50,51,54]. Therefore, the rise in visceral fat and the reduction in subcutaneous fat during aging could determine an increase in CMR [55].
Another key element is the phenomenon known as inflammaging, marked by a low-grade chronic inflammation during aging [52,53]. It is characterized by an increase in inflammatory biomarkers, particularly interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α) [52]. Visceral fat contributes to this pro-inflammatory environment by releasing these two mediators and adipokines [55], which in turn promote insulin resistance, impair mitochondrial function, and favor atherogenesis [38,50,52]. In this way, inflammation and visceral fat maintain a bidirectional relationship: the accumulation of visceral fat enhances the inflammatory response [55], whereas the inflammatory state facilitates visceral fat deposition by inhibiting lipolysis [52]. In addition, TNF-α hinders the replication and differentiation of preadipocytes, which reduces subcutaneous fat and reinforces the predominance of visceral fat [50,53].
Age-related hormonal changes, including decreased testosterone in men and reduced estrogen in women, promote visceral fat accumulation and muscle mass loss, increasing the fat-muscle ratio in the body [38]. This process is enhanced by the progressive reduction in physical activity levels in adulthood [2,38]. The result is a vicious circle in which functional capacity and energy expenditure decrease, while visceral fat accumulation and CMR increase [37]. In this context, BMI may provide a distorted view of CMR. As mentioned in the introduction, BMI does not distinguish between muscle mass and fat, nor does it provide information about the location of fat tissue (visceral or subcutaneous) [20,56]. It is common for older adults with sarcopenia to present normal BMI values despite having an excess of visceral fat and the consequent CMR [20]. In the adult population, WHtR is a more sensitive and specific indicator to identify central obesity and CMR [16,57]. WHtR directly reflects the accumulation of abdominal fat, regardless of variations in muscle mass. It has been observed that WHtR predicts the onset of type 2 diabetes mellitus, arterial hypertension, cardiovascular diseases, dyslipidemias, and metabolic syndrome better than BMI [16,21,56,58]. For all the above, the systematic monitoring of WHtR should be considered a priority tool in occupational health prevention and promotion programs, especially in workers over 40 years of age.
On the other hand, PS constitutes a widely studied risk factor linked to the development of obesity and cardiometabolic diseases [3,6,26,28,59,60]. Specifically, 71% of people with obesity have a sedentary behavior [26] and physical inactivity accounts for approximately 30% of ischemic heart diseases and 27% of diabetes cases [61]. Despite this, our study did not reveal a significant link between WHtR and occupational PS. We defined occupational PS as remaining seated for more than 4 consecutive hours during the workday. The lack of results could be due to the fact that this definition of occupational PS does not allow for precise knowledge of the actual sitting time of the workers. Total daily sitting time was not considered, as hours of sitting outside the workplace were not analyzed. It is possible that the workers in our sample compensated for sitting time at work with physical activity outside working hours. In fact, the scientific literature states that the negative effects of PS at work progressively decrease in physically active individuals and are completely overcome in those who perform 60–75 min of moderate-to-vigorous physical activity daily [62]. Therefore, it is possible that a high level of physical activity outside of work neutralized the negative effects of occupational PS on WHtR.
The scientific evidence analyzing the role of PS on WHtR is still very limited. To our knowledge, only three studies evaluated this relationship [4,61,63]. The three studies have taken into account total sitting time, both inside and outside the workplace, unlike us who focused exclusively on occupational PS. Phaswana et al. [4] and Mirzaei et al. [61] found that sitting for over 10 h per day significantly augmented the risk of presenting an elevated WHtR. Specifically, Mirzaei et al. [61] reported an OR of 1.8, whereas sitting between 1 and 3 h per day appears to be a protective factor (OR = 0.5) [61]. These results suggest that the total amount of sitting time is decisive for the increase in visceral fat. In contrast, Wanner et al. [63] did not show a relationship between total sitting time and WHtR. In this study, it was observed that participants who engaged in physical activity during their leisure time had significantly lower WHtR values, regardless of daily sitting time [63]. This supports the hypothesis formulated in the previous paragraph, namely that physical activity performed outside of work can neutralize the harmful effects of occupational PS.
Other studies have evaluated occupational PS exclusively, as we did. However, they analyzed parameters such as BMI or waist circumference without considering WHtR [28,59]. Hirata et al. [28] they found that truck drivers had a mean BMI of 27.2 kg/m2, considered overweight, and that 18.8% of the participants had an elevated waist circumference. It has been observed that this group spends 13 h sitting per day on workdays and 8 h on non-workdays [64]. This could partly explain the differences observed compared to our results, since in our study PS was defined as starting from 4 h. In addition, this study did not take into account other determining factors for the increase in visceral fat, such as age. On the other hand, Van Uffelen et al. [59] conducted a systematic review finding contradictory results. Five studies found a positive relationship between occupational PS and increased BMI, while another five observed no association [59]. This lack of consensus is probably due to variability in the definition of PS. In summary, the available scientific literature suggests that the impact of occupational PS alone on WHtR is uncertain and may be conditioned by total daily sitting time and, above all, by physical activity performed outside working hours. Future research are necessary to assess the effect of PS both inside and outside the workplace on WHtR and CMR, analyzing variables that may have an influence such as physical activity, diet, or sleep quality.

4.1. Practical Applications

Taking all the above into account, it is recommended to monitor WHtR in the field of occupational health, highlighting the importance of doing so especially in workers over 40 years of age due to its relevance for occupational safety. From this age onward, recommendations aimed at promoting a healthy lifestyle should be reinforced: engaging in regular physical activity, following a balanced diet, ensuring adequate nighttime rest, and eliminating alcohol and tobacco consumption [65,66,67,68]. Observations indicate that over 50% of the general population fail to meet the WHO’s weekly recommendations for physical activity (150 min of moderate and 75 min of vigorous activity) [32]. In addition, a study stated that, on average, adults spend more than half of their waking time sitting [34]. Therefore, although in our study occupational PS was not associated with an increase in WHtR, it is still recommended to adopt occupational risk prevention measures to reduce sitting time at work, given its relevance for occupational safety. Some of the proposed preventive measures are: (i) remain seated for less than 50% of the working day, (ii) avoid sitting for long periods by standing up at least once every 20–30 min, (iii) stand for at least 10 min after sitting for 2 h, (iv) avoid sitting more than 5 h per day, and (v) change position while sitting [3]. It should not be overlooked that occupational PS also entails other health risks, particularly musculoskeletal ones such as low back pain or neck stiffness [3,69]. It has also been linked with mental health problems, decreased concentration, and an increased number of errors [3,69]. Therefore, PS is crucial for occupational safety as it negatively impacts workers’ quality of life and their work productivity [3].
In Spain, occupational risk monitoring is the responsibility of the Labor and Social Security Inspectorate and the Health and Safety Committees in companies with more than 50 employees. These committees could implement prevention plans, including strategies we have described to mitigate risks such as sedentary workplace behavior, through measures such as health monitoring, promoting healthy habits, and assessing psychosocial risks. Generally, in Spain, I could suggest official policies that promote a less sedentary culture: (i) offer flexible schedules: adjust schedules to dedicate time to physical activity; (ii) mandatory “reinforcement breaks,” i.e., group/individual breaks of 10 to 15 min for movement during the workday, scheduled by a health sciences or occupational medicine professional; (iii) organize active meetings, with activities such as walking or creating specific meeting areas that allow for this; (iv) provide height-adjustable desks or exercise equipment to incorporate movement into their daily tasks [70].

4.2. Limitations and Strengths

This study has certain limitations that should be taken into account when interpreting the results. Only PS time at work was analyzed, without considering hours of PS outside the workplace. Since total daily sitting time may significantly influence WHtR, this omission could have conditioned the results. Second, relevant variables that could act as confounding factors, such as dietary habits or physical activity, were not collected. In addition, the sample consisted exclusively of men, despite obesity having a higher prevalence in women [2], which limits the extrapolation of the findings to the entire working population. Finally, the use of data from different medical teams could have increased inter-examiner variability. Nevertheless, the recommendations of the STROBE guidelines were followed, and a large, representative cohort of the male employees, consisting of 85,670 participants, was included.

5. Conclusions

After analyzing 85,670 male workers, it was observed that the increase in WHtR is significantly associated with older age. However, no clear association was found between WHtR and PS in the workplace. This may be explained by the fact that physical activity outside of work may neutralize the negative effects of occupational PS. Future studies are needed to analyze the effects of PS both inside and outside the workplace on WHtR and how physical activity influences it.

Author Contributions

Conceptualization, D.F.-L. and J.S.-C.; methodology, A.d.A.S., G.S. and D.F.-L.; software, A.d.A.S. and D.F.-L.; validation, G.S., R.C.M., Á.L.-L., E.J.-C., L.M.C. and D.F.-L.; formal analysis, A.d.A.S., J.S.-C., L.M.C., R.C.M. and D.F.-L.; investigation, A.d.A.S., E.J.-C., G.S., D.F.-L. and J.S.-C.; project administration, J.S.-C., R.C.M., D.F.-L. and L.M.C.; funding acquisition, J.S.-C. and D.F.-L. Writing—original draft, G.S. and D.F.-L.; prepared figures and/or tables, D.F.-L. and G.S.; Writing—revision, A.d.A.S., G.S. and D.F.-L. All authors have read and agreed to the published version of the manuscript.

Funding

This study was supported by the Department of Education of the Junta de Castilla & León and the European Regional Development Fund (ERDF) under the TCUE Plan 2023–2027 (grant no. 067/230003). The principal investigator was Diego Fernández-Lázaro.

Institutional Review Board Statement

The study was approved by the Clinical Research Ethics Committee (CEIC) of the University of León (Ref: ETHICS-ULE-017-2022). All subjects provided written informed consent in accordance with the Declaration of Helsinki and the 2013 Fortaleza revision.

Informed Consent Statement

Informed consent was obtained from all individual participants included in the study.

Data Availability Statement

Data supporting the findings of this study are available within the paper.

Acknowledgments

The authors wish to thank the Spain Conference of Deans of Physiotherapy Faculties and Physiotherapy Department, Institute of Biomedicine (IBIOMED), University of León (León, Spain) for their support in advising on the methodological design and result interpretation.

Conflicts of Interest

The authors declare no conflicts of interest.

Appendix A

Table A1. STROBE Statement-Checklist of Items That Should Be Included in Reports of Cross-Sectional Studies.
Table A1. STROBE Statement-Checklist of Items That Should Be Included in Reports of Cross-Sectional Studies.
Item NºRecommendation
Title and abstract1(a) Indicate the study’s design with a commonly used term in the title or the abstract
(b) Provide in the abstract an informative and balanced summary of what was done and what was found
Introduction
Background/rationale2Explain the scientific background and rationale for the investigation being reported
Objectives3State specific objectives, including any prespecified hypotheses
Methods
Study design4Present key elements of study design early in the paper
Setting5Describe the setting, locations, and relevant dates, including periods of recruitment, exposure, follow-up, and data collection
Participants6Give the eligibility criteria, and the sources and methods of selection of participants
Variables7Clearly define all outcomes, exposures, predictors, potential confounders, and effect modifiers. Give diagnostic criteria, if applicable
Data sources/measurement8 *For each variable of interest, give sources of data and details of methods of assessment (measurement). Describe comparability of assessment methods if there is more than one group
Bias9Describe any efforts to address potential sources of bias
Study size10Explain how the study size was arrived at
Quantitative variables11Explain how quantitative variables were handled in the analyses. If applicable, describe which groupings were chosen and why
Statistical methods12(a) Describe all statistical methods, including those used to control for confounding
(b) Describe any methods used to examine subgroups and interactions
(c) Explain how missing data were addressed
(d) If applicable, describe analytical methods taking account of sampling strategy
(e) Describe any sensitivity analyses
Results
Participants13 *(a) Report numbers of individuals at each stage of study—e.g., numbers potentially eligible, examined for eligibility, confirmed eligible, included in the study, completing follow-up, and analysed
(b) Give reasons for non-participation at each stage
(c) Consider use of a flow diagram
Descriptive data14 *(a) Give characteristics of study participants (e.g., demographic, clinical, social) and information on exposures and potential confounders
(b) Indicate number of participants with missing data for each variable of interest
Outcome data15 *Report numbers of outcome events or summary measures
Main results16(a) Give unadjusted estimates and, if applicable, confounder-adjusted estimates and their precision (e.g., 95% confidence interval). Make clear which confounders were adjusted for and why they were included
(b) Report category boundaries when continuous variables were categorized
(c) If relevant, consider translating estimates of relative risk into absolute risk for a meaningful time period
Other analyses17Report other analyses done—e.g., analyses of subgroups and interactions, and sensitivity analyses
Discussion
Key results18Summarise key results with reference to study objectives
Limitations19Discuss limitations of the study, taking into account sources of potential bias or imprecision. Discuss both direction and magnitude of any potential bias
Interpretation20Give a cautious overall interpretation of results considering objectives, limitations, multiplicity of analyses, results from similar studies, and other relevant evidence
Generalisability21Discuss the generalisability (external validity) of the study results
Other information
Funding22Give the source of funding and the role of the funders for the present study and, if applicable, for the original study on which the present article is based
* Give information separately for exposed and unexposed groups.

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Safety 11 00105 g001
Figure 1. Flow diagram of the participants recruited according to the STROBE guidelines [40].
Figure 1. Flow diagram of the participants recruited according to the STROBE guidelines [40].
Safety 11 00105 g001
Table 1. Sample description.
Table 1. Sample description.
Year 2022
CategoryWorkers < 40 years (37.9%)Workers ≥ 40 years (62.1%)
AmountPercentageAmountPercentage
Total workers14,454100%23,728100%
Normal WHtR970667.2%889237.5%
elevated WHtR474932.8%14,83762.5%
PS with elevated WHtR106522.4%353423.8%
Rest of positions with high WHtR368577.6%11,30476.2%
Year 2023
CategoryWorkers < 40 years (36.7%)Workers ≥ 40 years (63.3%)
AmountPercentage Amount
Total workers17,431100%Total workers17,431
Normal WHtR11,38565.3%Normal WHtR11,385
elevated WHtR604734.7%elevated WHtR6047
PS with elevated WHtR146424.2%PS with elevated WHtR1464
Rest of positions with high WHtR458475.8%Rest of positions with high WHtR4584
Abbreviations: PS: prolonged sitting. WHtR: waist-to-height ratio.
Table 2. Chi-square test for the association between elevated waist-to-height ratio and prolonged sitting.
Table 2. Chi-square test for the association between elevated waist-to-height ratio and prolonged sitting.
Period 2022<40 Years≥40 YearsChi-Square Resultp-Value
Workers with PS and elevated WHtR10653534X2 = 0.73p = 0.391
Workers without PS and elevated WHtR368511,304X2= 0.86p = 0.354
Period 2023<40 years≥40 yearsChi-Square Resultp-Value
Workers with PS and elevated WHtR14644794X2 = 1.11p = 0.292
Workers without PS and elevated WHtR458414,285X2 = 1.24p = 0.265
Abbreviations: PS: prolonged sitting. WHtR: waist-to-height ratio. p-value < 0.05 was considered statistically significant.
Table 3. Pearson’s correlation coefficient for the association between waist-to-height ratio, age, and prolonged sitting.
Table 3. Pearson’s correlation coefficient for the association between waist-to-height ratio, age, and prolonged sitting.
YearVariablesPearson Correlation Coefficient
2022AgeWHtR0.62 **
2022PSWHtR0.15 *
2023AgeWHtR0.64 **
2023PSWHtR0.17 *
Abbreviations: PS: prolonged sitting. WHtR: waist-to-height ratio. Very weak correlation: r = 0.00–0.10, * Weak correlation: r = 0.10–0.30, Moderate correlation: r = 0.30–0.50, ** Strong correlation: r = 0.50–1.00 [47,48].
Table 4. Odds ratio of age and prolonged sitting for elevated waist-to-height ratio.
Table 4. Odds ratio of age and prolonged sitting for elevated waist-to-height ratio.
YearIndependent VariableOR (95% CI)p-Value
2022Age (≥40 years)2.50 (1.56-5.17)p < 0.01 *
2022Prolonged sitting1.15 (0.42–2.64)p = 0.42
2023Age (≥40 years)2.60 (1.28–4.99)p < 0.01 *
2023Prolonged sitting1.18 (0.84–1.33)p = 0.39
*: p-value < 0.05 was considered statistically significant; OR: Odds Ratio; CI: Confidence Interval.
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de Arriba Santos, A.; Santamaría, G.; Cobreros Mielgo, R.; Cacharro, L.M.; López-Llorente, Á.; Jiménez-Callejo, E.; Seco-Calvo, J.; Fernández-Lázaro, D. Association Between Workplace Sedentary Behavior, Age, and Waist-to-Height Ratio in Spanish Male Workers: An Observational Study in a Large Occupational Cohort. Safety 2025, 11, 105. https://doi.org/10.3390/safety11040105

AMA Style

de Arriba Santos A, Santamaría G, Cobreros Mielgo R, Cacharro LM, López-Llorente Á, Jiménez-Callejo E, Seco-Calvo J, Fernández-Lázaro D. Association Between Workplace Sedentary Behavior, Age, and Waist-to-Height Ratio in Spanish Male Workers: An Observational Study in a Large Occupational Cohort. Safety. 2025; 11(4):105. https://doi.org/10.3390/safety11040105

Chicago/Turabian Style

de Arriba Santos, Alejandro, Gema Santamaría, Raúl Cobreros Mielgo, Luis M. Cacharro, Álvaro López-Llorente, Elena Jiménez-Callejo, Jesús Seco-Calvo, and Diego Fernández-Lázaro. 2025. "Association Between Workplace Sedentary Behavior, Age, and Waist-to-Height Ratio in Spanish Male Workers: An Observational Study in a Large Occupational Cohort" Safety 11, no. 4: 105. https://doi.org/10.3390/safety11040105

APA Style

de Arriba Santos, A., Santamaría, G., Cobreros Mielgo, R., Cacharro, L. M., López-Llorente, Á., Jiménez-Callejo, E., Seco-Calvo, J., & Fernández-Lázaro, D. (2025). Association Between Workplace Sedentary Behavior, Age, and Waist-to-Height Ratio in Spanish Male Workers: An Observational Study in a Large Occupational Cohort. Safety, 11(4), 105. https://doi.org/10.3390/safety11040105

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