Table 3.

Hours of recreational physical activity and colon cancer incidence by type of activity, number of cases, age- and multivariate-adjusted RR and 95% CI, CPS II Nutrition Cohort men and women, 1992-1993 to 1999

Men
Women
Men and women
Recreational physical activity in year before study enrollmentNo. casesAge-adjusted RR (95% CI)Multivariate-adjusted* RR (95% CI)No. CasesAge-adjusted RR (95% CI)Multivariate-adjusted* RR (95% CI)Multivariate-adjusted* RR (95% CI)
Type of recreational physical activity (h/wk)
No activity791.00 (reference)1.00 (reference)391.00 (reference)1.00 (reference)1.00 (reference)
Walking only
    <41430.80 (0.61-1.05)0.87 (0.66-1.15)1250.98 (0.68-1.40)1.00 (0.70-1.44)0.91 (0.73-1.14)
    4-6720.77 (0.56-1.06)0.83 (0.60-1.16)601.04 (0.69-1.56)1.08 (0.71-1.63)0.92 (0.71-1.18)
    ≥7510.84 (0.59-1.19)0.88 (0.61-1.25)251.15 (0.70-1.91)1.18 (0.71-1.95)0.96 (0.72-1.29)
P for trend, with and without reference group0.39, 0.910.34, 0.840.47, 0.460.41, 0.460.76, 0.79
Walking plus other activities
    <4700.64 (0.46-0.88)0.73 (0.53-1.02)760.92 (0.63-1.36)0.99 (0.67-1.47)0.83 (0.64-1.06)
    4-6450.75 (0.52-1.08)0.85 (0.58-1.24)260.67 (0.41-1.11)0.72 (0.43-1.19)0.79 (0.58-1.06)
    ≥7430.46 (0.32-0.67)0.53 (0.36-0.78)270.55 (0.33-0.89)0.59 (0.36-0.98)0.55 (0.40-0.74)
P for trend, with and without reference group0.0004, 0.110.02, 0.160.01, 0.050.07, 0.070.003, 0.03
  • * Models included age, education, exercise level in 1982, cigarette smoking, alcohol, red meat, folate, fiber, multivitamin use in 1982, and hormone replacement therapy (women). Models of men and women combined also included sex.

  • Included walking, jogging/running, lap swimming, tennis or racquetball, bicycling/stationary bike, aerobics/calisthenics, and dancing.