Table 3.

HR and 95% CI of lung cancer according to physical activity by smoking status and gender

Total physical activity index (kcal/wk)*No. casesPerson-yearsHR (95% CI)Ptrend
Current smokers
    0-174364,0521
    175-874154,0260.48 (0.26-0.91)
    ≥875123,1070.49 (0.25-0.97)0.02
Never/former smokers
    0-1742914,4771
    175-8742315,0810.97 (0.55-1.71)
    ≥8751916,2360.60 (0.33-1.11)0.10
Females
    0-1742811,9411
    175-8741710,7371.02 (0.54-1.95)
    ≥8751010,1660.66 (0.30-1.44)0.35
Males
    0-174376,5901
    175-874218,3830.56 (0.33-0.97)
    ≥875219,1920.50 (0.29-0.87)0.01
  • * Kilocalories per week from city blocks walked, flights of stairs climbed, and sweat-inducing activities (see Materials and Methods).

  • Total person-years for cases and noncases in category of activity.

  • Models are adjusted for age, sex, pack-years of smoking, time since smoking cessation, body mass index, alcohol intake, and education.