Table 3.
Odds ratio of gaining≥5% of baseline body weight between 1989 and 2005 by time spent bicycle riding in 2005 while adjusting for baseline bicycling (1989) among premenopausal women, for all women and for women stratified by 1989 BMI
| Bicycle riding in 2005 | P-trend | |||||
|---|---|---|---|---|---|---|
| 0 min/d | 1–59 min/week | 1–1.5 hrs/week | 2–3 hrs/week | ≥4 hrs/week | ||
| All women | ||||||
| N | 13,432 | 2,886 | 1,259 | 564 | 273 | |
| Mean weight change, kg (SE) | 9.7 (0.1) | 8.6 (0.2) | 8.0 (0.2) | 6.9 (0.3) | 5.6 (0.4) | |
| Simple OR (95%CI) (a) | 1.00 (Ref) | 0.92 (0.83–1.01) | 0.79 (0.69–0.90) | 0.68 (0.56–0.81) | 0.56 (0.43–0.72) | |
| Multivariate OR (95%CI) (b) | 1.00 (Ref) | 0.97 (0.88–1.08) | 0.94 (0.82–1.08) | 0.85 (0.70–1.02) | 0.71 (0.55–0.93) | <0.01 |
|
| ||||||
| BMI<25 | ||||||
| N | 10,391 | 2,382 | 1,045 | 469 | 231 | |
| Mean weight change, kg (SE) | 8.7 (0.1) | 7.9 (0.2) | 7.6 (0.2) | 6.8 (0.3) | 5.5 (0.4) | |
| Simple OR (95%CI) (a) | 1.00 (Ref) | 0.95 (0.85–1.05) | 0.82 (0.71–0.94) | 0.75 (0.61–0.92) | 0.58 (0.44–0.76) | |
| Multivariate OR (95%CI) (b) | 1.00 (Ref) | 1.00 (0.90–1.12) | 0.95 (0.82–1.11) | 0.95 (0.76–1.17) | 0.74 (0.56–0.98) | 0.10 |
|
| ||||||
| BMI≥25 | ||||||
| N | 3,041 | 504 | 214 | 95 | 42 | |
| Mean weight change, kg (SE) | 13.1 (0.2) | 11.9 (0.6) | 10.2 (0.9) | 7.4 (1.2) | 5.7 (1.9) | |
| Simple OR (95%CI) (a) | 1.00 (Ref) | 0.78 (0.63–0.97) | 0.68 (0.50–0.92) | 0.43 (0.28–0.66) | 0.47 (0.25–0.89) | |
| Multivariate OR (95%CI) (b) | 1.00 (Ref) | 0.86 (0.68–1.09) | 1.02 (0.72–1.43) | 0.54 (0.34–0.86) | 0.53 (0.26–1.05) | 0.01 |
(a)
Adjusted for 1989 baseline age, weight, and bicycling.
(b)
Adjusted for 1989 baseline age, weight, and bicycling; 1989 baseline and 2005 slow walking, brisk walking, other activity, and total sitting at home; plus the covariates listed in Table 2 footnote c.