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Table 4 Rates and hazard ratios (HR) of ischemic heart disease (IHD) and all-cause mortality by heavy lifting activities, occupational physical activity level, and physical activity level in leisure time at work for men and women in the Danish National Health Interview Surveys From 1987, 1994, and 2000

From: Occupational heavy lifting and risk of ischemic heart disease and all-cause mortality

Physical activity IHD All-cause mortality
   No of cases Ratea HRb 95% CI HRc 95% CI No of cases Ratea HRb 95% CI HRc 95% CI
Men             
Heavy lifting (n=6,659)             
  No 343 6.3 1.00 Reference 1.00 Reference 179 6.3 1.00 Reference 1.00 Reference
  Yes 193 5.4 1.09 0.91, 1.30 1.52 1.15, 2.02 341 5.1 1.00 0.84, 1.20 1.00 0.74, 1.35
Occupational physical activity (n= 6,639)             
  Low 369 6.7 1.00 Reference 1.00 Reference 317 5.7 1.00 Reference 1.00 Reference
  High 162 4.7 0.82 0.68, 0.99 0.50 0.37, 0.68 201 5.9 1.13 0.94, 1.35 1.02 0.75, 1.39
Physical activity in leisure time (n=5,660)             
  Low 73 6.3 1.00 Reference 1.00 Reference 269 5.9 1.00 Reference 1.00 Reference
  High 292 3.2 0.70 0.54, 0.91 0.73 0.56, 0.95 58 2.6 0.69 0.52, 0.92 0.72 0.54, 0.96
Women             
Heavy lifting (n=5,850)             
No 158 6.3 1.00 Reference 1.00 Reference 197 6.3 1.00 Reference 1.00 Reference
Yes 56 5.4 1.15 0.84, 1.56 0.81 0.50, 1.56 63 5.1 1.11 0.83, 1.48 0.95 0.59, 1.53
Occupational physical activity (n= 5,839)             
Low 138 2.5 1.00 Reference 1.00 Reference 183 3.3 1.00 Reference 1.00 Reference
High 77 3.1 1.36 1.03, 1.80 1.55 0.98, 2.44 77 3.1 1.03 0-79, 1.35 0.94 0.60, 1.50
Physical activity in leisure time (n=5,029)             
Low 128 2.5 1.00 Reference 1.00 Reference 149 3.0 1.00 Reference 1.00 Reference
High 20 1.8 0.91 0.57, 1.47 0.98 0.61, 1.58 17 1.5 0.70 0.42, 1.15 0.85 0.51, 1.41
  1. Abbreviations: CI, confidence interval; HR, hazard ratio; n, number of participants.
  2. a Pr. 1,000 person-years.
  3. b Adjusted for age.
  4. c Adjusted for age, education, alcohol consumption, smoking status, stress, heavy lifting, occupational physical activity, and physical activity in leisure time.