Table 6

Estimated odds ratios (OR) and 95% confidence intervals (CI) of disability in walking, stair climbing, and running according to age and birth cohort* among men (n=758) and women (n=1033)

TaskPredictorMen OR (95% CI)Women OR (95% CI)
*The GEE model with age (continuous variable) and survey period (categorical variable) as predictors. †Age, OR for one year’s difference in age. ‡Birth cohort, ORs for other cohorts compared with the cohort I (=reference category; OR=1.00).
WalkingAge (y)†1.10 (1.08 to 1.13)1.09 (1.08 to 1.11)
Cohort‡
    I (1917–1921)1.001.00
    II (1922–1926)1.23 (0.78 to 1.92)0.97 (0.67 to 1.42)
    III (1927–1931)1.19 (0.75 to 1.89)0.81 (0.56 to 1.18)
    IV (1932–1936)1.44 (0.87 to 2.38)1.04 (0.70 to 1.55)
    V (1937–1941)1.22 (0.70 to 2.13)0.87 (0.56 to 1.36)
    p for linear trend0.230.63
Stair climbingAge (y)†1.05 (1.04 to 1.07)1.05 (1.04 to 1.06)
Cohort‡
    I (1917–1921)1.001.00
    II (1922–1926)1.01 (0.64 to 1.61)0.69 (0.46 to 1.03)
    III (1927–1931)0.65 (0.41 to 1.03)0.64 (0.43 to 0.94)
    IV (1932–1936)0.62 (0.38 to 1.02)0.62 (0.41 to 0.93)
    V (1937–1941)0.42 (0.25 to 0.71)0.45 (0.29 to 0.68)
    p for linear trend<0.001<0.001
RunningAge (y)†1.09 (1.07 to 1.11)1.07 (1.06 to 1.09)
Cohort‡
    I (1917–1921)1.001.00
    II (1922–1926)1.05 (0.61 to 1.83)1.08 (0.64 to 1.81)
    III (1927–1931)0.83 (0.49 to 1.42)0.83 (0.51 to 1.35)
    IV (1932–1936)0.91 (0.53 to 1.58)0.73 (0.44 to 1.19)
    V (1937–1941)0.62 (0.36 to 1.09)0.59 (0.35 to 0.98)
    p for linear trend0.0200.002