Table 2

The association between occupational physical activity and risk of MI

  Model 1*Model 2†Model 3‡Model 4§Model 5¶
HR (95% CI)HR (95% CI)HR (95% CI)HR (95% CI)HR (95% CI)
OPA (total)MI cases during follow-upn=9961n=9961n=9952n=9048n=9056
1**n=11611111
2††n=741.29 (0.96 to 1.72)1.21 (0.90 to 1.62)1.13 (0.83 to 1.54)1.12 (0.80 to 1.56)1.15 (0.84 to 1.58)
3‡‡n=591.20 (0.87 to 1.64)0.98 (0.71 to 1.34)0.86 (0.59 to 1.24)0.86 (0.57 to 1.29)0.90 (0.64 to 1.28)
OPA (>35 hours/week)n=9058n=9058n=9049n=8247n=8255
1**n=10111111
2††n=671.36 (1.00 to 1.86)1.27 (0.94 to 1.75)1.18 (0.85 to 1.63)1.14 (0.80 to 1.61)1.20 (0.86 to 1.69)
3‡‡n=551.26 (0.91 to 1.75)1.04 (0.75 to 1.45)0.87 (0.59 to 1.27)0.87 (0.57 to 1.32)0.98 (0.68 to 1.41)
  • Analysis made for the total sample and restricted to those working 35 hours per week or more. HRs with 95% CI.

  • *Model 1, adjusted for age.

  • †Model 2, adjusted for age and sex.

  • ‡Model 3, adjusted for age, sex and socioeconomic status.

  • §Model 4, adjusted for age, sex, socioeconomic status and lifestyle factors (smoking, leisure time physical activity, alcohol, fruit and vegetable consumption).

  • ¶Model 5, adjusted for age, sex and lifestyle factors.

  • **OPA 1=seated for more than 50% of working day, no lifting or carrying.

  • ††OPA 2=standing or walking for more than 50% of working day, no lifting or carrying.

  • ‡‡OPA 3=lifting or carrying regardless of whether seated or standing/walking.

  • MI, myocardial infarction.