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Article

Relationship between Negative Work Situation, Work-Family Conflict, Sleep-Related Problems, and Job Dissatisfaction in the Truck Drivers

by
Dong Seok Shin
1 and
Byung Yong Jeong
2,*
1
Korea National Industrial Convergence Center, Korea Institute of Industrial Technology, Ansan 15588, Korea
2
Department of Industrial & Management Engineering, Hansung University, Seoul 02876, Korea
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(19), 8114; https://doi.org/10.3390/su12198114
Submission received: 11 September 2020 / Revised: 28 September 2020 / Accepted: 29 September 2020 / Published: 1 October 2020
(This article belongs to the Section Sustainable Transportation)
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Abstract

:
Understanding the relationship between psychological factors of truck drivers is very important for accident prevention plans. This study investigates whether the negative work situation or work-family conflict positively affects sleep-related problems and whether sleep-related problems positively affect job dissatisfaction. The relationship was verified by structural equation modeling. The analysis was conducted with 184 truck drivers who drive daily from the 5th Korea Working Conditions Survey (KWCS) data. The structural equation modeling results found that work-family conflict (standardized path coefficient = 0.274) and negative work situation (standardized path coefficient = 0.203) had significantly affected sleep-related problems. Also, the sleep-related problems were more affected by the work-family conflict level than the negative work situation level. Sleep-related problems were found to correlate with job dissatisfaction (standardized path coefficient = 0.336). The relationship between negative work situation and work-family conflict on sleep-related problems and job dissatisfaction will help establish preventive policies for truck drivers’ safety and health.

1. Introduction

1.1. Truck Drivers and Purpose of Study

Truck drivers who transport cargo to a local region or long-haul area play a role in the e-commerce and logistics industries [1]. In Korea Standard Classification of Occupations [2], truck and special truck drivers are classified into freight-vehicle drivers and special-purpose-vehicle drivers. Freight-vehicle is defined as a truck whose loaded weight is larger than the total weight of passengers inside, and a special-purpose-vehicle is a vehicle that is adequately designed to perform particular tasks [3]. In this study, truck drivers include freight-vehicle drivers and special-purpose-vehicle drivers. In 2018, there were 1,235,045 workers at 383,737 establishments in the freight trucking industry of South Korea [4].
Truck drivers’ tasks include checking the transport records and delivering the vehicle to its destinations [1]. Truck drivers are treated as self-employed in South Korea [1]. Some self-employed truck drivers buy or lease trucks and go into business for themselves [1]. Truck drivers who are self-employed can control the number of workdays and their schedules. Truck drivers can maintain their income by long working hours because of intensified competition [5]. Self-employed truck drivers who purchase cars as installments are subject to economic pressure due to car payments and tend to increase workdays to increase their monthly income. They often have to drive until the late hours of the night, and they may experience irregular and insufficient meals [5].
Furthermore, large truck drivers may be away home for days or weeks, leading to insufficient sleep [6]. Lee and Jeong [1] pointed out that it is necessary to support truck drivers’ chronic fatigue to prevent crashes caused by drowsy driving. Thus, truck driver is recognized as an occupation with the highest rates of injuries and illnesses [6,7].
Truck drivers may experience prolonged sitting and be exposed to many unhealthy conditions such as long driving distances, irregular shifts, insufficient rest, fatigue, and environmental hazards [6,8]. The drivers also have a stressful nature of work—tight timelines, congested roads, customers’ rude behavior, the direct relationship of hours of work and incentives, and not enough time for relaxation [1,9].
Human-related factors caused 73.8% of the crashes in an analysis of tank truck crashes [10]. Human-related factors can be categorized into driver’s properties [11], organizational factors [12], and direct causes of the crash (such as drowsy driving, inattention, and violation) [13]. These human-related factors are primarily associated with psychophysiological stressors, and psychophysiological stressors increase the likelihood of aggressive driving and poor mental health outcomes [14]. Thus, understanding the relationship between psychological factors is very important for accident prevention plans.
Psychological factors related to truck drivers include work situation, work-family conflict (or work-family balance), sleep-related problems, and job satisfaction [7,8,9,13,14,15,16,17,18,19,20,21]. Previous studies suggested that truck drivers’ psychological factors were related to incidents [17,18,19,20,21]. However, there are a lack of studies analyzing the structural relationship between work situations, work-life balance, sleep-related problems, and job satisfaction.
This study aims to understand the factors influencing sleep-related problems and job dissatisfaction among truck drivers. A structural equation model combining the previous studies was performed to test three hypotheses on the relationships between negative working situations, work-family conflicts, sleep-related problems, and job dissatisfaction.

1.2. Theoretical Background and Hypotheses

1.2.1. Sleep-Related Problems

Driver drowsiness is common among truck drivers working extended hours [6,9,13]. Truck drivers suffer from sleep-related problems more than the general population [22]. Long working hours and unpredictable schedules are related to sleep problems [23,24]. Sleep-related problems increase risks for incidents and injuries [1,18,19,20,25]. Drowsiness was involved in 10.5% of the delivery truck crashes in South Korea [5]. These risks affect the profitability of the transportation company, medical costs for health insurance, and ultimately public safety [21].

1.2.2. Work Situation

The work situation is the social relationships that workers enter into their workplace [26]. It is related to the work environment, employment conditions, and employee’s satisfaction [27]. It also includes individual rights and professional development opportunities within the company [28]. The truck driver’s working conditions still are not good, and negative work situations are common [1,5]. In this study, negative work situations mean unfortunate or hostile social relationships that workers experience in their workplace. The negative work situation in the workplace saps energy and diverts attention from productivity and performance [20]. It can also lead to poor mental health outcomes, especially sleep-related problems.
This research created the following hypotheses:
Hypothesis 1 (H1):
Negative work situations positively affect sleep-related problems.

1.2.3. Work-Family Conflict

Extended driving hours and irregular schedules can reduce the likelihood of family spending and lead to work-family conflict. Work-family conflict is the degree to which workers are not satisfied with the role of work and family: time-sharing, involvement, and satisfaction with work and family [16,17]. One primary reason for the work-family conflict is the lack of time-sharing due to extended driving hours [17]. Work-life conflict, social isolation, or unfortunate work situations can intrude into workers’ private lives, leading to sleep-related problems [17,18].
As explained in the literature above, this study hypothesized:
Hypothesis 2 (H2):
Work-family conflicts positively affect sleep-related problems.

1.2.4. Job Satisfaction

Job satisfaction can be defined as the subjective interpretation of individual opinion based on the extent of fulfilling their requirements at work and in work situations, relationships, or activities related to it [26,27]. It also refers to a personal attitude, such as the overall impression, feeling, and evaluation that an individual has about the job. In this study, job dissatisfaction means the negative attitude or evaluation that workers have about the job. Job dissatisfaction can lead to negative outcomes [29]. Truck drivers suffer from sleep-related problems, and job dissatisfaction is common [13,19,21,25]. Sleep-related problems can cause a truck driver’s job dissatisfaction. Thus, this research created the following hypotheses:
Hypothesis 3 (H3):
Sleep-related problems positively affect job dissatisfaction.

2. Materials and Methods

2.1. Data Collection

This study used data and questionnaires from the 5th Korea Working Conditions Survey (KWCS) in 2017. KWCS is a national survey to investigate workers’ working conditions and risk factors by industry [30]. The questionnaire used in this study is identical to that of the 6th European Working Conditions Survey (EWCS) [31]. The raw data of the KWCS was received from the Institute for Occupational Safety and Health [30].
In the 5th KWCS, 50,205 workers participated in proportion to each region’s population in South Korea. Among them, drivers in the freight trucking industry were selected as this study’s subjects. A total of 184 professional truck drivers were extracted as the final data. All of them were male, with 11.4% of those ≥ 60 years, and 38.6% of those in their 50s. The mean of driver’s age was 54.9 years, with a standard deviation of 9.40.

2.2. Research Variables

The research variables consisted of latent variables for a negative work situation, work-family conflict, sleep-related problems, and job dissatisfaction. Table 1 shows the latent variables and measurement variables for each latent variable. As shown in Table 1, all measurement variables were scored to the Likert scaling from 1 to 5.
Negative work situation was based on the Q49 questions of the 2017 KWCS questionnaire (same as Q61 questions of the 2015 EWCS questionnaire) [31]. Some of the Q49 measurement variables in the KWCS questionnaire were removed through prior reliability analysis. The measurement variables for the negative work situations in Table 1 represent the results after prior removal.
Work-family conflict was represented by the Q38 questions of the 2017 KWCS questionnaire (same as Q45 questions of the 2015 EWCS questionnaire). As shown in Table 1, these questions have five measurement variables on work-family conflict [31].
Sleep-related problems were represented by the Q63 questions of the 2017 KWCS questionnaire (same as Q79 questions of the 2015 EWCS questionnaire). As shown in Table 1, these questions have three measurement variables on sleep-related problems [18].
Job dissatisfaction was based on the Q71 questions of the 2017 KWCS questionnaire (same as Q90 questions of the 2015 EWCS questionnaire). As shown in Table 1, it is the same as Warr et al.’s job dissatisfaction index [32].

2.3. Data Analysis and Structural Equation Model

This study proposed hypotheses based on the literature review. The hypotheses are as follows:
  • H1: Negative work situations positively affect sleep-related problems.
  • H2: Work-family conflicts positively affect sleep-related problems.
  • H3: Sleep-related problems positively affect job dissatisfaction.
This study merged two relationships to create a more robust model. Sleep-related problems were a dependent variable and an explanatory variable in the model. The relationship was verified by structural equation modeling (SEM). SEM has the advantage of estimating this kind of interdependence of several variables that reflect measurement errors.
Figure 1 shows the initial structural model. In Figure 1, ellipse means latent variable, and a rectangle is the measurement variable. Di is a disturbance or residual, and ei is measurement error.
In the structural equation model, negative work situation, which is a latent variable, is measured by 6 questionnaire items, work-family conflict by 5 questionnaire questions, sleep-related problems by 3 questionnaire questions, and job dissatisfaction by 6 questionnaire questions.
AMOS 18 and SPSS version 18.0 were used as analytical tools. The internal consistency of measured variables was performed by reliability analysis. Some measurement variables were eliminated by the standardized Cronbach’s alpha. The convergent validity was confirmed through factor analysis. Path analysis was then performed to evaluate the proposed hypotheses.

3. Results

3.1. Reliability Analysis

Table 2 displays the final results of reliability analysis to ensure the internal consistency of the measurement variables. As shown in Table 2, two measurement variables in negative work situation and two measurement variables in job dissatisfaction were removed by Cronbach’s alpha. The final result of reliability analysis yields a Cronbach’s α value of 0.821, and it is very satisfactory.

3.2. Exploratory Factor Analysis

Factor analysis was useful for refining measures and evaluating construct validity.
In Bartlett’s test and Kaiser-Meyer-Olkin (KMO) test results, Bartlett’s test was significant (p < 0.001), and the KMO was above 0.60 (0.774). Factor analytical results, shown in Table 3, revealed that the factors could be classified into four dimensions: negative work situation, work-family conflict, sleep-related problems, and job dissatisfaction. From Table 2 and Table 3, research variables and factors showed acceptable reliability and construct validity.

3.3. Structural Model Assessment

A chi-square test value usually determines the model fit, and other indices have been used for the assessment. The goodness of fit (GOF) was evaluated and compared with the suggested criteria shown in Table 4. The goodness of fit indices in Table 4 represented an acceptable fit of the model (χ2 = 202.898, p < 0.001; NFI = 0.821; CFI = 0.897; GFI = 0.878; TLI = 0.874; RMSEA = 0.076).

3.4. Convergent Validity

The convergent validity was confirmed by average variance extracted (AVE) and composite reliability (CR). In Table 5, CR values were between 0.784 and 0.874 (acceptable criteria: > 0.70), so these results show strong composite reliability. The AVE values were also greater than correlations between variables, so the results supported convergent validity.

3.5. Nomological Validity

Figure 2 represents the direction of the correlation between latent variables. Figure 2 shows that the proposed relationships have the same directions, with relationships shown in Figure 2. The results supported the nomological validity.

3.6. Hypothesis Testing of the Structural Model

The structural model was evaluated to validate the hypothesized relationships. Table 6 represents the results of hypothesis testing for the proposed relationships among the constructs.
In Table 6, negative work situation and work-family conflict were found to have significantly positive effects on sleep-related problems. Thus, H1 and H2 were statistically validated. Similarly, sleep-related problems significantly influenced job satisfaction. H3, therefore, was statistically supported.

3.7. Effect of Work Situation and Work-Life Balance on Sleep-Related Problems and Job Satisfaction

As shown in Figure 3, negative work situations positively affected sleep-related problems (standardized path coefficient = 0.203). It can be interpreted that the higher the level of the negative work situation, the more significant influence on sleep-related problems. Among the measurement variables for a negative work situation, ‘feeling well’ (0.752) and ‘enough time’ (0.666) were found to be the influential variables.
The work-family conflict also had a significant impact on sleep-related problems (standardized path coefficient = 0.274). In other words, a higher work-family conflict level led to a higher level of sleep-related problems. Among the measurement variables for work-family conflict, ‘family’ (0.825) and ‘tired’ (0.721) were found to be the influential variables.
Also, sleep-related problems were more affected by the level of work-family conflict (0.274) than the negative work situation (0.203). Among the measurement variables for sleep-related problems, ‘waking up repeatedly’ (0.851) and ‘difficulty fall asleep’ (0.845) were the influential variables.
On the other hand, the sleep-related problems (standardized path coefficient = 0.336) affected job dissatisfaction. That is, a higher level of sleep-related problems led to a higher level of job dissatisfaction. Among the measurement variables for job satisfaction, ‘enthusiastic’ (0.792) and ‘energy’ (0.731) were the influential variables.

4. Discussion

Truck drivers are exposed to sleep-related problems and stress due to physical and mental fatigue [33]. Irregular shift schedules and extended driving hours are related to mental problems and adverse effects on health behaviors. Truck drivers are highly stressed by irregular working hours and shifts, leading to drowsy driving or dangerous driving situations. Truck drivers complain about not getting enough information and support for safety and health management. They work isolated from family and colleagues, so they often do not have access to health-related resources [34]. Furthermore, fatigue and sleep disturbances affect circadian rhythms and increase traffic crashes [25]. Therefore, driving schedule planning, work redesign, and health protection programs should be considered to prevent collisions [35].
Age-related declines in cognitive, perceptual, and motor capabilities negatively affect driving performance [36]. In South Korea, as the elderly population increases, the average age of truck drivers is rising. In this study, the proportion of respondents aged ≥60 years accounted for 50.0% by reflecting the truck drivers’ population ratio. Traffic crashes caused by elderly truck drivers are also increasing [1,5]. Thus, an active policy for elderly truck drivers is required. The driver-centered approach to the work environment and conditions can improve the work situation for safety and health [37,38]. Universal safety and design concepts can be an opportunity to enhance the working environment of older drivers and promote economic participation in society through policy and design considerations for seniors [39,40].
Limiting driving time can reduce work-family conflict and drowsiness [41]. Measures to ensure the effectiveness of hours-of-service regulation and institutional aspects regarding working hours and break times can improve working conditions. For truck drivers, how to monitor and implement a safe driving strategy is essential. U.S. truck drivers are required to have electronic onboard monitoring to adhere to hours of service regulations [42].
Workplace health and wellness program is being recognized as potentially enhancing employee health, satisfaction, and productivity. Researchers recommend psychological counseling as a way to improve a driver’s sleep-related problem. Workplace health promotion programs also emphasize changes in health behavior [43]. Comprehensive efforts on working condition improvements and workplace health programs are recommended to yield better driver health outcomes [23,44] because comprehensive efforts could increase effectiveness and participation [37].

5. Conclusions

This research examined the interrelationships between negative work situation, work-family conflict, sleep-related problems, and job dissatisfaction. Based on the literature survey, this study tested three hypotheses on the interrelationships between negative work situation, work-family conflict, sleep-related issues, and job dissatisfaction. The results of this study suggested that negative work situation and work-family conflict significantly influence sleep-related problems in truck drivers. Also, truck drivers’ sleep-related problems significantly affect their job dissatisfaction. The results of this study can be used to establish preventive policies for truck drivers’ safety and health.

Author Contributions

Conceptualization, D.S.S. and B.Y.J.; methodology, D.S.S. and B.Y.J.; data collection & analysis, D.S.S.; resources, D.S.S. and B.Y.J.; data curation, D.S.S.; writing—original draft preparation, D.S.S. and B.Y.J.; writing—review and editing, D.S.S. and B.Y.J.; supervision, D.S.S.; funding acquisition, D.S.S. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by MOTIE (Ministry of Trade, Industry and Energy), grant number N0002430.

Acknowledgments

This research was financially supported by MOTIE (Ministry of Trade, Industry and Energy) and KITECH (Korea Institute of Industrial Technology) for Dong Seok Shin. Also, this research was financially supported by Hansung University for Byung Yong Jeong. The authors are grateful to the Occupational Safety and Health Research Institute (OSHRI) and the Korea Occupational Safety and Health Agency (KOSHA) for providing the raw data from the KWCS.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Conceptual model of this study. Rectangle represents measurement variable, and ellipse represents latent variable. Di: disturbance or residual; ei: measurement error.
Figure 1. Conceptual model of this study. Rectangle represents measurement variable, and ellipse represents latent variable. Di: disturbance or residual; ei: measurement error.
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Figure 2. Result of confirmatory factor analysis. Rectangle represents measurement variable, and ellipse represents latent variable. Di: disturbance or residual; ei: measurement error.
Figure 2. Result of confirmatory factor analysis. Rectangle represents measurement variable, and ellipse represents latent variable. Di: disturbance or residual; ei: measurement error.
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Figure 3. Final model of this study. Rectangle represents measurement variable, and ellipse represents latent variable. Di: disturbance or residual; ei: measurement error.
Figure 3. Final model of this study. Rectangle represents measurement variable, and ellipse represents latent variable. Di: disturbance or residual; ei: measurement error.
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Table
Table 1. Research variables of this study.
Table 1. Research variables of this study.
Latent VariableSelected Measurement VariableVariable AbbreviationDescription and Score
Negative work situationYou can take a break when you wishWS11.Always~5.Never
You have enough time to get the job doneWS2
Your job gives you the feeling of work well doneWS3
You are able to apply your own ideas in your workWS4
You have the feeling of doing useful workWS5
You know what is expected of you at workWS6
Work-family conflictWorry about work when not workingF11.Never~5.Always
Too tired after work to do household workF2
Job prevents giving time to familyF3
Hard to concentrate on job because of familyF4
Family prevents giving time to jobF5
Sleep-related problemsDifficulty falling asleepS11.Never~5.Daily
Waking up repeatedly during the sleepS2
Waking up with a feeling of exhaustion and fatigueS3
Job dissatisfactionAt my work I feel full of energyJ11.Always~5.Never
I am enthusiastic about my jobJ2
Time flies when I am workingJ3
In my opinion, I am good at my jobJ4
I feel exhausted at the end of the working dayJ51.Never~5.Always
I doubt the importance of my workJ6
Table
Table 2. Results of reliability analysis using Cronbach’s Alpha.
Table 2. Results of reliability analysis using Cronbach’s Alpha.
Latent VariableInitial Measurement VariablesFinal Measurement VariablesStandardized Cronbach’s Alpha
Negative work situation640.748
Work-family conflict550.813
Sleep-related problems330.821
Job dissatisfaction640.800
Instrument Total 0.821
Table
Table 3. Results of exploratory factor analysis and construct validity.
Table 3. Results of exploratory factor analysis and construct validity.
FactorMeasurement VariableComponent
1234
Work-family conflictF3: Family0.811−0.0060.1850.043
F5: Responsibility0.7740.220−0.0380.035
F4: Concentration0.7250.187−0.0060.036
F2: Tired0.7090.0010.1070.193
F1: Worry0.6800.134−0.0590.195
Job dissatisfactionJ2: Enthusiastic0.2340.7720.0850.126
J3: Time0.0720.7530.0620.148
J4: Work well0.0410.7530.2370.015
J1: Energy0.1440.7440.0950.081
Negative work situationWS1: Break−0.067−0.0980.8030.096
WS2: Enough time0.0660.0870.7640.074
WS3: Feeling well0.1070.3230.7150.105
WS4: Ideas0.0700.3240.632−0.040
Sleep related problemsS1: Fall asleep0.1010.1000.0820.874
S2: Waking up repeatedly0.1060.1580.0160.867
S3: Exhaustion/fatigue0.1960.0680.1190.760
Instrument Total% of Variance18.21316.57014.30014.022
Cumulative (%)63.105
Kaiser-Meyer-Olkin test0.774
Bartlett’s test p < 0.001
Table
Table 4. Results of model fit test.
Table 4. Results of model fit test.
Goodness of Fit IndexGood FitAcceptable FitStructural Model
χ 2 202.898
df 98
χ 2 /df< 22.0–5.02.070
p-value< 0.0010.050< 0.001
NFI> 0.900.85–0.900.821
CFI> 0.900.85–0.900.897
GFI> 0.900.85–0.900.878
TLI> 0.900.85–0.900.874
RMSEA< 0.060.06–0.080.076
Table
Table 5. Convergent validity and correlations with variables.
Table 5. Convergent validity and correlations with variables.
HypothesisNegative Work SituationWork-Family ConflictSleep-Related ProblemsAverage Variance Extracted (AVE)Composite Reliability
Negative work situation 0.4780.784
Work-family conflict0.217 0.4680.814
Sleep-related problems0.2500.323 0.6870.866
Job dissatisfaction0.4790.4030.3120.6360.874
Table
Table 6. Results of hypothesis testing for the proposed relationships.
Table 6. Results of hypothesis testing for the proposed relationships.
HypothesisPathsStandardized Coefficient (r)Critical Ratiop-ValueResult
H1Negative work situation
→ Sleep-related problems		0.2032.1610.031Supported
H2Work-family conflict
→ Sleep-related problems		0.2742.9390.003Supported
H3Sleep-related problems
→ Job dissatisfaction		0.3363.714< 0.001Supported

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MDPI and ACS Style

Shin, D.S.; Jeong, B.Y. Relationship between Negative Work Situation, Work-Family Conflict, Sleep-Related Problems, and Job Dissatisfaction in the Truck Drivers. Sustainability 2020, 12, 8114. https://doi.org/10.3390/su12198114

AMA Style

Shin DS, Jeong BY. Relationship between Negative Work Situation, Work-Family Conflict, Sleep-Related Problems, and Job Dissatisfaction in the Truck Drivers. Sustainability. 2020; 12(19):8114. https://doi.org/10.3390/su12198114

Chicago/Turabian Style

Shin, Dong Seok, and Byung Yong Jeong. 2020. "Relationship between Negative Work Situation, Work-Family Conflict, Sleep-Related Problems, and Job Dissatisfaction in the Truck Drivers" Sustainability 12, no. 19: 8114. https://doi.org/10.3390/su12198114

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