Table 3.

Associations of physical activity with rate ratios and 95% CIs of endometrial cancer for 33,723 women in the Swedish Mammography Cohort

VariablePhysical activityNo. casesPerson-yearsRR (95% CI)*RR (95% CI)RR (95% CI)
Work/occupation§Low109127,8911.001.001.00
High90116,6570.91 (0.68-1.21)0.97 (0.72-1.31)1.01 (0.75-1.37)
Household workLow, <5 h/d139180,8411.001.001.00
High, ≥5 h/d6063,7071.03 (0.75-1.41)1.05 (0.76-1.46)0.99 (0.71-1.38)
Walking/bicycling (mainly for transportation)Low, <1 h/d175203,0901.001.001.00
High, ≥1 h/d2441,4580.66 (0.43-1.02)0.67 (0.43-1.04)0.71 (0.45-1.10)
Leisure time activity (including exercise)Low, <20 min/d99191,1911.001.001.00
High, ≥20 min/d10053,3570.85 (0.60-1.22)0.90 (0.67-1.21)0.99 (0.73-1.32)
Leisure time inactivity (watching TV/sitting)Low, <5 h/d175229,5581.001.001.00
High, ≥5 h/d2414,9901.92 (1.23-3.00)1.80 (1.14-2.83)1.66 (1.05-2.61)
  • * Rate ratios from Cox proportional hazards models adjusted for age in months.

  • Rate ratios from Cox proportional hazards models adjusted for age in months, parity (0, 1-2, 3+), history of diabetes (yes/no), total fruit and vegetable (intake in quartiles <239 g, 239-344 g, 345-482 g, 483+ g), education, and work/occupation, walking/bicycling, household work, leisure time activity, and leisure time inactivity (watching TV/sitting) simultaneously.

  • Additionally adjusted for BMI [<20, 20-25, 26-30, 30+ (kg/m)].

  • § High: mostly standing up, doing lifts, a lot of lifts, and heavy labor; low: mostly sitting down and sitting down more than half of the time.

  • High level is >50th percentile in the cohort.

  • High level is >75th percentile in the cohort.