Study of Association between Job Stress and Cardiovascular Disease Risk Factors among Employees of Urmia Petrochemical Company and Isfahan Polyacryle Corporation

Tahereh Alinia (
Epidemiology and Biostatistics, Urmia University of Medical Science
August, 2011


Introduction: Stress at work is an increasing common feature of modern life. Job stress (JS) has adverse health effects on cardiovascular system. The aim of this study was to examine the relations between JS and cardiovascular risk factors including high systolic and diastolic blood pressure, smoking, diabetes, body mass index, high level of Low density lipoprotein, triglyceride and cholesterol and low level of high density lipoprotein.

Methods: The study was conducted among random sample of 121 employees of Urmia petrochemical company and 227 employees of Isfahan polyacryle company. Questionnaire included demographic characteristics, smoking status, JS and negative affectivity. JS was assessed by most recent model of measuring stress, effort reward model. Two indicator of job stress were effort reward imbalance (ERI) and overcommitement (OC). A blood sample was taken in order to determine biologic risk factors. Multiple logistic regressions and linear regression was applied for analyzing data. All analysis controled for negative affectivity, age, marital status, number of child, education level , shift working, type of contract and duration of employment.

Findings: Content validity index was 88%. Cronbach alpha for effort, reward and OC were 61%, 85%, 62% respectively for Urmia petrochemical company and 70%, 84%, 67% respectively for Isfahan polyacryle company. Test – retest reliability in Urmia petrochemical Company for effort, reward and OC were 68%, 74%, 81% respectively .Prevalence of ERI in petrochemical and polyacryle companies were 52.9% and 26.9% respectively. Average score of OC were 15.62 for petrochemical company and 14.14 for polyacryle company. According to multivariate analysis results, mean difference of systolic blood presure between persons with ERI and persons without ERI was 4.34 mmHg (p=0.002), per each unit increase in OC, diastolic blood presure increase by 0.51 (p=0.028). mean difference of diastolic blood presure between persons with ERI and persons without ERI was2.69 mmHg (p=0.018). Multivariate analysis results showed positive relationship between systolic and diastolic blood presure, body mass index ans smoking.

Conclusion: This study showed high prevalence of JS. There were positive association between JS and systolic and diastolic blood presure, body mass index and smoking.

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