Susanna Toivanen1. 1. Centre for Health Equity Studies (CHESS), Stockholm University/Karolinska Institutet, SE-106 91 Stockholm, Sweden. susanna.toivanen@chess.su.se
Abstract
OBJECTIVES: This study estimated the risk of incident stroke according to the level of job control and examined whether the association between job control and the risk of stroke varied as a function of gender. METHODS: This was a register-based cohort study of nearly 3 million working people (age 30-64 years in 1990) with a 13-year follow-up (1991-2003) for incident stroke (50 114 events). Job control was aggregated to the data by a secondary data source (job-exposure matrix) in 1990. Gender-specific Cox regressions were applied. RESULTS: The age- and workhour-adjusted hazard ratio of the lowest versus the highest job control quartile was 1.25 [95% confidence interval (95% CI) 1.17-1.32] for any stroke, 1.33 (95% CI 1.15-1.55) for intracerebral hemorrhage, and 1.22 (95% CI 1.14-1.31) for brain infarction among the women, and the corresponding figures for the men were 1.24 (95% CI 1.21-1.28), 1.30 (95% CI 1.21-1.40), 1.23 (95% CI 1.19-1.28), respectively. Adjustment for education, marital status, and income attenuated these associations to 1.07 (95% CI 1.01-1.14) for any stroke, 1.22 (95% CI 1.04-1.42) for intracerebral hemorrhage, and 1.04 (95% CI 0.97-1.12) for brain infarction for the women and to 1.08 (95% CI 1.04-1.12), 1.12 (95% CI 1.03-1.22), 1.08 (95% CI 1.04-1.13), respectively, for the men. CONCLUSIONS: The relative risk of stroke was higher in low job-control occupations. The association between job control and stroke subtypes varied as a function of gender. The relative risk of intracerebral hemorrhage was highest for the women in low job-control occupations.
OBJECTIVES: This study estimated the risk of incident stroke according to the level of job control and examined whether the association between job control and the risk of stroke varied as a function of gender. METHODS: This was a register-based cohort study of nearly 3 million working people (age 30-64 years in 1990) with a 13-year follow-up (1991-2003) for incident stroke (50 114 events). Job control was aggregated to the data by a secondary data source (job-exposure matrix) in 1990. Gender-specific Cox regressions were applied. RESULTS: The age- and workhour-adjusted hazard ratio of the lowest versus the highest job control quartile was 1.25 [95% confidence interval (95% CI) 1.17-1.32] for any stroke, 1.33 (95% CI 1.15-1.55) for intracerebral hemorrhage, and 1.22 (95% CI 1.14-1.31) for brain infarction among the women, and the corresponding figures for the men were 1.24 (95% CI 1.21-1.28), 1.30 (95% CI 1.21-1.40), 1.23 (95% CI 1.19-1.28), respectively. Adjustment for education, marital status, and income attenuated these associations to 1.07 (95% CI 1.01-1.14) for any stroke, 1.22 (95% CI 1.04-1.42) for intracerebral hemorrhage, and 1.04 (95% CI 0.97-1.12) for brain infarction for the women and to 1.08 (95% CI 1.04-1.12), 1.12 (95% CI 1.03-1.22), 1.08 (95% CI 1.04-1.13), respectively, for the men. CONCLUSIONS: The relative risk of stroke was higher in low job-control occupations. The association between job control and stroke subtypes varied as a function of gender. The relative risk of intracerebral hemorrhage was highest for the women in low job-control occupations.
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