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Table 3 Number of working hours per week and the risk of self-reported hypertension in 1079 normotensive workers

From: Effect of Long Working Hours on Self-reported Hypertension among Middle-aged and Older Wage Workers

  Number of working hours per week  
  ≤40 41–50 51–60 ≥61 p for trend
  (n = 421) (n = 337) (n = 178) (n = 143)  
No. of onsets 24 31 14 16  
Follow-up periods (person-months) 1569.12 1230.38 646.68 528.03  
Rate per 1000 person-months 15.30 25.20 21.65 30.30  
Model 1 (95% CI) 1.00 (reference) 1.64 (0.97–2.75) 1.50 (0.79–2.84) 1.99 (1.06–3.73) 0.036
Model 2 (95% CI) 1.00 (reference) 1.63 (0.97–2.74) 1.46 (0.77–2.78) 1.81 (0.95–3.44) 0.074
Model 3 (95% CI) 1.00 (reference) 1.79 (1.06–3.03) 1.72 (0.89–3.30) 1.95 (1.02–3.73) 0.033
Model 4 (95% CI) 1.00 (reference) 2.20 (1.19–4.06) 2.40 (1.07–5.39) 2.87 (1.33–6.20) 0.013
  1. Model 1 was not adjusted.
  2. Model 2 was adjusted for age and sex.
  3. Model 3 was adjusted for age, sex and health-related factors including smoking habit, alcohol habit, regular exercise, and body mass index (BMI).
  4. Model 4 was adjusted for age, sex, health-related factors, education and occupational factors including income, occupation, form of emplyment, and working days per week.
  5. All hazard ratios were calculated using a Cox proportional hazards model with weighted cases.
  6. CI = Confidence interval.