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Int. J. Environ. Res. Public Health 2012, 9(9), 3245-3257; doi:10.3390/ijerph9093245
Published: 5 September 2012
Abstract: The aim of this study was to assess the prevalence of hazardous and harmful alcohol use and associated factors among patients with tuberculosis in South Africa. In a cross-sectional survey new tuberculosis (TB) and TB retreatment patients were consecutively screened using the Alcohol Use Disorder Identification Test (AUDIT) within one month of anti-tuberculosis treatment. The sample included 4,900 (54.5% men and women 45.5%) tuberculosis patients from 42 primary care clinics in three districts. Results indicate that, overall 23.2% of the patients were hazardous or harmful alcohol drinkers, 31.8% of men and 13.0% of women were found to be hazardous drinkers, and 9.3% of men and 3.4% of women meet criteria for probable alcohol dependence (harmful drinking) as defined by the AUDIT. Men had significantly higher AUDIT scores than women. In multivariable analyses it was found that among men poor perceived health status, tobacco use, psychological distress, being a TB retreatment patient and not being on antiretroviral therapy (ART), and among women lower education, tobacco use and being a TB retreatment patient were associated with hazardous or harmful alcohol use. The study found a high prevalence of hazardous or harmful alcohol use among tuberculosis primary care patients. This calls for screening and brief intervention and a comprehensive alcohol treatment programme as a key component of TB management in South Africa.
South Africa has 0.7% of the World’s population and 28% of the World’s population of HIV and TB co-infected individuals. It has been estimated that approximately 60% of people with TB are co-infected with HIV . Co-infected patients have almost double the chances of getting multidrug-resistant TB (MDR-TB) as well as extensively drug-resistant TB (XDR-TB). These patients also have a high mortality rate due to co-infection with HIV . In addition to alcohol’s role in the onset of TB, there is also strong evidence of a negative influence of heavy drinking/alcohol use disorder (AUD) on the clinical course of TB, higher relapse rates and experiencing the most destructive forms of TB [3,4].
Prevalence of alcohol use disorders among TB patients have ranged from 10% to 50% in studies carried out in Australia, Canada, Russia, Switzerland, and the USA . There is only a few studies which have assessed alcohol use disorders in tuberculosis patients in low and middle income countries: Kazakhstan: 4% alcohol abusers ; Russia: 24–62% alcohol abuse/dependent [6,7,8,9,10]; India: 14.9–32% alcohol abusers/alcoholics [11,12,13]; Brazil: 14–24% alcohol abusers [14,15] and South Africa: 31–62% alcohol misuse . Alcohol use was estimated to have been responsible for 939,000 disability-adjusted life-years lost in South Africa for TB and HIV/AIDS alone in 2004 (253,000 for women, 687,000 for men). This figure corresponds to 4.6% of the overall disease burden in South Africa (2.5% for women, 6.6% for men) . Factors associated with alcohol use in tuberculosis patients include: (male) gender [10,13], older age , being married , school education , middle income , treatment category  and TB medication non-adherence [5,9,10,11,18,19]. Smoking plus alcohol abuse was found as a probable risk factor for pulmonary tuberculosis in Chengdu, China . Previous studies also found that anxiety or depression and tobacco use were associated with alcohol use disorders in general patients [21,22,23,24].
There is a lack of information on prevalence of alcohol use and AUD amongst TB patients and its impact on adherence and disease progression, in particular in low and middle income countries [3,4]. Detecting alcohol use disorders, specifically alcohol abuse and dependence, provides a critical opportunity for early intervention efforts to reduce adverse impacts of consumption. It is against this background that the reported study was carried out. The findings from this study will assist the national TB programme in South Africa to develop effective intervention strategies for TB patients with problems related to alcohol use. The aim of the study is to estimate prevalence of recent alcohol use and hazardous or harmful drinking among TB patients attending public primary care clinics in South Africa.
2.1. Sample and Procedure
This is a cross-sectional survey with tuberculosis patients in public primary care clinics in South Africa. Three provinces, in South Africa, with the highest TB caseload were selected for inclusion in the study. One district in each of three provinces with the highest TB caseloads were ultimately included. These districts were Siyanda in Northern Cape Province, Nelson Mandela. Metro in the Eastern Cape Province, and EThekwini in KwaZulu-Natal Province. Within each of these three study districts 14 primary health care facilities were selected on the basis of the highest TB caseloads per clinic, in all 42 clinics. The type of health facilities were public primary health care clinic or community health centre.
All new TB and retreatment patients were consecutively screened using the Alcohol Use Disorder Identification Test (AUDIT) within one month of anti-tuberculosis treatment. The screening interview was conducted by trained external research assistants for a period of 6 months in all 42 clinics in 2011. A health care provider who identified a new TB treatment or retreatment patient (within one month on treatment) and 18 years and above informed the patient about the study and referred the patient for participation if interested. A research assistant asked for permission/consent from patients attending the primary care facility to participate in the screening interview. Because of the stigma associated with alcohol consumption, individuals may feel defensive when responding to questions about their drinking and answer inaccurately.
To increase the reliability of the AUDIT, researchers have suggested putting alcohol consumption in the context of other health-related behaviours . Therefore, the interviewer administered questionnaire included questions on mental and physical health status, tobacco use and chronic diseases. We have received ethical approval from the Human Sciences Research Council Research Ethics Committee (Protocol REC No.1/16/02/11). The Department of Health in South Africa has also provided approval for this study.
2.2.1. Socioeconomic Characteristics
A researcher-designed questionnaire is used to record information on participants’ age, gender, educational level, marital status, income, employment status, dwelling characteristics and residential status. Poverty was assessed with five items on the availability or non-availability of shelter, fuel or electricity, clean water, food and cash income in the past week. Response options ranged from 1 = “Not one day” to 4 = “Every day of the week”. Poverty was defined as higher scores on non-availability of essential items. The total score ranged from 5 to 20, 5 = being low, 6−12 = medium and 13−20 = high poverty. Cronbach alpha for this poverty index was 0.89 in this sample.
2.2.2. Alcohol Consumption
The 10-item Alcohol Disorder Identification Test (AUDIT)  assesses alcohol consumption level (three items), symptoms of alcohol dependence (three items), and problems associated with alcohol use (four items). Heavy episodic drinking is defined as the consumption of six standard drinks (10 g of alcohol) or more on a single occasion . In South Africa a standard drink is 12 g of alcohol. Because AUDIT is reported to be less sensitive at identifying risk drinking in women , the cut-off points of binge drinking for women (four units) were reduced by one unit as compared with men (five units), as recommended by Freeborn et al. .
Responses to items on the AUDIT are rated on a 4-point Likert scale from 0 to 4, for a maximum score of 40 points. Higher AUDIT scores indicate more severe levels of risk; a score of 8 indicates a tendency to problematic drinking or hazardous or harmful drinking. The AUDIT was developed by the World Health Organization as an effective screening instrument for alcohol use problems among patients seeking primary care for other medical problems in international settings including African countries (Kenya and Zimbabwe) [25,26] and has been validated in HIV patients in South Africa showing excellent sensitivity and specificity in detecting MINI-defined dependence/abuse (area under the receiver-operating characteristic curve, 0.96)  and among TB and HIV patients in primary care in Zambia demonstrating good discriminatory ability in detecting MINI-defined current AUDs (AUDIT = 0.98 for women and 0.75 for men) . Cronbach alpha for the AUDIT in this sample was 0.92, indicating excellent reliability. Hazardous drinking is defined as a quantity or pattern of alcohol consumption that places patients at risk for adverse health events, while harmful drinking is defined as alcohol consumption that results in adverse events (e.g., physical or psychological harm) .
2.2.3. Tobacco Use
Two questions were asked about the use of tobacco products: (1) Do you currently use one or more of the following tobacco products (cigarettes, snuff, chewing tobacco, cigars, etc.)? Response options were “yes” or “no”; (2) In the past month, how often have you used one or more of the following tobacco products (cigarettes, snuff, chewing tobacco, cigars, etc.)? Response options were once or twice, weekly, almost daily and daily.
2.2.4. Kessler Psychological Distress Scale (K-10)
The Kessler Psychological Distress Scale (K-10) was used to measure global psychological distress, including significant pathology which does not meet formal criteria for a psychiatric illness [31,32]. This scale measures the following symptoms over the preceding 30 days by asking: “In the past 30 days, how often did you feel: nervous; so nervous that nothing could calm you down; hopeless; restless or fidgety; so restless that you could not sit still; depressed; that everything was an effort; so sad that nothing could cheer you up; worthless; tired out for no good reason?” The frequency with which each of these items was experienced was recorded using a five-point Likert scale ranging from “none of the time” to “all the time”.
The total score of the scale is summed with higher scores reflecting a greater degree of psychological distress, range 10–40. The K-10 has been shown to capture variability related to non-specific depression, anxiety and substance abuse, but does not measure suicidality or psychoses . This scale serves to identify individuals who are likely to meet formal definitions for anxiety and/or depressive disorders, as well as to identify individuals with sub-clinical illness who may not meet formal definitions for a specific disorder .
This scale is increasingly used in population mental health research and has been validated in multiple settings  including in a population-based survey in South Africa . The K10 demonstrated moderate discriminating ability in detecting depression and anxiety disorders in the general population in South Africa; evidenced by area under the receiver operating curves of 0.73 and 0.72 respectively, with a cut off of 16 . We examined the K-10 scale using the cut off of 16 indicating psychological distress. The internal reliability coefficient for the K-10 in this study was alpha = 0.92.
2.2.5. Health Status. Perceived General Health
Participants were asked, “In general, would you say your health is: excellent, very good, good, fair or poor?” The measure was categorized based on participant response (very good = excellent/very good, good, and poor = fair/poor). TB treatment status, HIV status and antiretroviral treatment was assessed by self-report and from medical information. Patients were also asked about a list of chronic and other illness conditions they had been diagnosed with such as diabetes.
2.3. Data Management and Analysis
Data from the questionnaires were entered manually and verified. The verification process included double data entry of all questionnaires and its fields, doing programmed range checks by computer to identify outlying values, checking for missing values, and checking for inconsistencies in the data. Data were analyzed using Statistical Package for the Social Sciences (SPSS) for Windows software application programme version 19.0. Frequencies, means, standard deviations, were calculated to describe the sample. Data were checked for normality distribution and outliers. For non-normal distribution non-parametric tests were used. Associations of hazardous or harmful alcohol use were identified using logistic regression analyses. Following each univariate regression, multivariable regression models were constructed. Independent variables from the univariate analyses were entered into the multivariable model if significant at P < 0.05 level. Logistic regression was conducted for men and for women separately. For each model, the R2 are presented to describe the amount of variance explained by the multivariable model. Probability below 0.05 was regarded as statistically significant.
3. Results and Discussion
3.1. Sample Characteristics
From the total sample (N = 4,935) included in the study 35 subjects (0.7%) refused to participate, so the final sample included 4,900, 54.5% men and 45.5% women, with a mean age of 36.2 years (SD = 11.5), range 18 to 93 years. Almost two-thirds of the participants (65.2%) were between 25 to 44 years old, the majority (72.7%) was never married, 27.7% had completed secondary education, and 17% scored high on the poverty index. Regarding the TB treatment status, 76.6% were new TB patients and 23.4% were TB retreatment patients. From those who had tested for HIV, 59.9% were HIV positive, 22% of the HIV positive patients were on antiretroviral therapy, 9.6% had never tested for HIV. One in five patients (20.0%) were daily or almost daily tobacco users, 81.0% indicated having psychological distress, 4.5% had been diagnosed with diabetes and 46.3% perceived their health status as fair or poor (see Table 1).
|Table 1. Sample characteristics.|
|Variable||Total sample (n = 4,900)||Hazardous or harmful alcohol use|
|Total||Men (n = 2,671) (54.5%)||Women (n = 2,229) (45.5%)|
|45 or more||1,040||21.5||268||26.2||211||34.9||51||13.0|
|Grade 7 or less||1,269||26.3||355||28.4||255||34.7||94||19.0|
|Grade 12 or more||1,336||27.7||205||15.5||153||25.2||49||7.1|
|Poverty index (5–20)|
|New TB patient||3,707||76.6||777||21.2||566||29.4||194||11.6|
|TB retreatment patient||1,128||23.4||333||30.0||247||39.1||83||17.9|
|Daily or almost daily tobacco use||980||20.0||485||49.9||401||52.0||74||40.0|
|Psychological distress (Kessler 10 > 15)||3,970||81.0||941||24.2||686||33.0||230||13.6|
|Perceived health status|
|Diagnosed with diabetes||194||4.5||37||19.2||27||30.7||9||9.1|
|On antiretroviral therapy||906||22.0||163||18.2||105||26.6||57||11.5|
3.2. Alcohol Use
Using a cut-off score of 8 to 19 for the AUDIT analysis indicated that 22.5% of all men and 9.5% of all women were classified as hazardous drinkers, and 9.3% of men and 3.4% of women meet criteria for probable alcohol dependence (harmful drinking) (with an AUDIT score of 20 or more) as defined by AUDIT. Overall 23.2% of the patients were hazardous or harmful alcohol users, 31.8% among men and 13.0% among women. Men had significantly higher AUDIT scores than women (see Table 2).
|Table 2. Alcohol use by sex.|
|Group||AUDIT score||Total N (%)||Men N (%)||Women N (%)||χ2 or *||P|
|Abstainers and low-risk drinkers||0–7||3,688 (76.8)||1,759 (68.2)||1,878 (81.6)||233.41||0.000|
|High risk drinkers||8–19||799 (16.6)||579 (22.5)||206 (9.5)||234.10||0.000|
|Probable alcohol dependence||20+||321 (6.6)||241 (9.3)||74 (3.4)|
|Hazardous or harmful drinkers||8+||1,120 (23.2)||820 (31.8)||280 (13.0)||233.41||0.000|
|M (SD)||M (SD)||M (SD)|
|Total AUDIT score||4.3 (8.1)||5.7 (8.1)||2.4 (6.0)||*||0.000|
* Mann-Whitney U test = P < 0.001.
3.3. Results of Logistic Regression: Associations between Sociodemograhic and Health Variables and Hazardous or Harmful Alcohol Use
Univariate analyses found that among men lower formal education, greater poverty, poorer perceived health status, being a TB retreatment patient, tobacco use and not being on ART were associated with hazardous or harmful alcohol use, while among women lower formal education, greater poverty, being on TB retreatment and tobacco use were associated with hazardous or harmful alcohol use. In multivariable analyses it was found that compared to male participants with excellent or very good health status, male participants with fair or poor health status were 1.34 times more likely to be hazardous or harmul alcohol users. Compared to male participants who were not daily or almost daily tobacco users, male participants who were daily or almost daily tobacco users were 3.71 times more likely to be hazardous or harmul alcohol users. Male participants who had psychological distress were 1.40 more likely to be hazardous or harmful alcohol users compared to male participants who did not have psychological distress. Compared to male participants who were new TB patients, male participants who were TB retreatment patients were 1.30 more likely to be hazardous or harmul alcohol users, and male participants who were on ART were 34% less likely to be hazardous or harmful alcohol users than male participants who were not on ART. Compared to female participants who attained Grade 7 or less education, female participants who had Grade 12 or more education were 67% less likely to be hazardous or harmful alcohol drinkers. Further, compared to female participants who were new TB patients, female participants who were TB retreatment patients were 1.44 more likely to be hazardous or harmul alcohol users, and female participants were daily or almost daily tobacco users were 6.06 times more likely to be hazardous or harmul alcohol users (see Table 3).
|Table 3. Results of logistic regression: Associations between sociodemograhic and health variables and hazardous or harmful alcohol use.|
|Cr OR (95% CI) a||Adj OR (95% CI) a,b||Cr OR (95% CI) a||Adj OR (95% CI) a,c|
|31–44||0.96 (0.79–1.17)||0.89 (0.70–1.13)||1.05 (0.79–1.39)||1.01 (0.76–1.34)|
|45 or more||1.17 (0.94–1.46)||1.03 (0.72–1.43)||1.04 (0.73–1.47)||1.00 (0.70–1.42)|
|Married/cohabitating||0.88 (0.72–1.08)||1.17 (0.84–1.62)|
|Separated/divorced/widowed||0.74 (0.50–1.09)||1.47 (0.89–2.40)|
|Grade 7 or less||1.00||1.00||1.00||1.00|
|Grade 8–11||0.93 (0.77–1.13)||1.34 (0.99–1.83)||0.71 (0.53–0.95) *||0.73 (0.52–1.04)|
|Grade 12 or more||0.64 (0.50–0.81) ***||1.08 (0.74–1.58)||0.32 (0.22–0.47) ***||0.33 (0.21–0.51) ***|
|Medium||1.29 (1.06–1.56) **||1.11 (0.88–1.99)||1.45 (1.06–1.98)||1.35 (0.97–1.89)|
|Poverty high||1.43 (1.11–1.83) **||1.11 (0.81–1.51)||1.85 (1.25–2.73) **||1.38 (0.90–2.10)|
|Perceived health status|
|Good/||1.35 (1.06–1.71) *||1.42 (1.06–1.90) *||1.10 (0.76–1.60)|
|Fair/poor||1.33 (1.06–1.67) *||1.34 (1.00–1.80) *||1.07 (0.75–1.53)|
|New TB patient||1.00||1.00||1.00||1.00|
|TB retreatment patient||1.54 (1.28–1.86) ***||1.30 (1.03–1.65) *||1.67 (1.26–2.21) ***||1.44 (1.05–1.97) *|
|Daily or almost daily tobacco use||3.59 (3.01–4.30) ***||3.71 (3.00–4.59) ***||5.72 (4.12–7.94) ***||6.06 (4.02–9.14) ***|
|Psychological distress (K−10 > 15)||1.35 (1.09–1.68) **||1.40 (1.07–1.84) *||1.36 (0.96–1.92)||---|
|Diabetes||0.91 (0.57–1.44)||---||0.66 (0.33–1.32)||---|
|HIV positive||0.91 (0.76–1.09)||1.07 (0.81–1.42)|
|On ART||0.77 (0.60–0.98) *||0.76 (0.58–0.98) *||0.91 (0.66–1.25)||---|
a Using “enter” logistic regression selection of variables; b For men Hosmer and Lemeshow Chi-square 9.59, df 8, 0.295; Cox and Snell R2 0.09; Nagelkerke R2 0.13; c For women Hosmer and Lemeshow Chi-square 5.56, df 8, 0.696; Cox and Snell R2 0.06; Nagelkerke R2 0.11; * p < 0.05; ** p < 0.01; *** p < 0.001.
This study provides new information on the prevalence of hazardous or harmful alcohol use in patients being treated for TB. Our results found high rates of hazardous or harmful drinking (23.2%) among tuberculosis public primary care patients in South Africa, which is consistent with studies conducted in low and middle income countries [6,7,8,9,10,11,12,13,14,15,16]. Previous studies using the same alcohol measure (the AUDIT) found lower rates of hazardous or harmful alcohol use in general public primary care patients in South Africa 13.3%  and 19.2%  and in a national population-based survey in South Africa (9%) . The higher prevalence of hazardous and harmful alcohol use among tuberculosis than general primary care patients may be in line with the causal link between alcohol abuse and tuberculosis [3,4,39].
Further, this study found, based on multivariable analysis, in concordance with other studies that male gender  and tobacco use [20,23,24] were associated with hazardous or harmful alcohol use. In univariate analysis this study found greater poverty, as found in other studies , to be associated with alcohol use. There is a concern as alcohol users from poor households spend large proportions of their income on alcohol and tobacco potentially leading to a vicious cycle between treatment outcomes and the patient’s low financial situation [13,40]. Further, the study showed that being on TB retreatment patient was associated with hazardous or harmful alcohol use. Also other studies found TB retreatment patients category  and TB medication non-adherence [5,9,10,11,18], which may have led to retreatment, to be associated with hazardous or harmful alcohol use. This seems to confirm evidence of a negative influence of heavy drinking/alcohol use disorder (AUD) on the clinical course of TB, higher relapse rates and experiencing the most destructive forms of TB [3,4]. In agreement with other studies , this study found no difference regarding association with HIV and alcohol consumption. In agreement with other studies in general patients [21,22,23,24,41], this study found among men an association between anxiety or depression with alcohol use disorders.
5. Study Limitations
Caution should be taken when interpreting the results of this study because of certain limitations. As this is a cross-sectional study, causality between the compared variables cannot be concluded. Further, we relied on self-report data; thus, the alcohol prevalence rates are subject to biases such as problems recalling alcohol use and social desirability of responses . However, the AUDIT has been found to be reliable and acceptable for screening use internationally , in South Africa  and among tuberculosis patients in Zambia , and to have validity similar to other established self-report instruments . Other limitations include that no drug screening and no standardized psychiatric measures (such as the Structured Interview for DSM-IV Axis I disorders) were used.
The study found a high prevalence of hazardous or harmful alcohol use among tuberculosis primary care patients. The identification of factors such as daily or almost daily tobacco users and being a TB retreatment patient should guide the design and implementation of programmes aimed to reduce hazardous or harmful alcohol use. The study brings about a number of clinical and policy issues. First, TB health facilities need to develop specific programmes to screen for and detect alcohol use disorders in patients being treated for TB. Second, South Africa needs to develop a comprehensive approach to the treatment of alcohol problems in TB patients including brief interventions delivered by nurses or community health workers and medical practitioners may wish to consider using pharmacotherapy for alcohol dependence. Third, programmes need to integrate prevention of HIV infection in this population .
The Department of Health in South Africa funded this study through a tender “NDOH: 21/2010–2011 Implementation and monitoring of Screening and Brief Intervention for alcohol use disorders among Tuberculosis patients” that was awarded to the HSRC. Annariina Marjaa Koivu assisted with the literature search. Her work was supported, in part, by INDIGO: the International Doctorate in Global Health, funded by Irish Aid.
Conflict of Interest
The authors declare no conflict of interest.
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