Table 3.
Odds Ratios (95% Confidence Interval)a for Weight Gain of ≥2.3 Kilograms over Any 3-Year Period,b According to Physical Activity Level,c Women’s Health Study, 1992–2007
| Physical Activity (MET-Hr/Week) |
|||||
|---|---|---|---|---|---|
| Group | <7.5 | 7.5–<21 | ≥21 | P, Trend | P, Interaction |
| All women (n=34,079) | 1.11 (1.07–1.14) | 1.07 (1.04–1.11) | Referent | <0.0001 | -- |
| Women, by age: | 0.51 | ||||
| <55 yr (n=21,363)d | 1.08 (1.02–1.14) | 1.05 (0.99–1.11) | Referent | 0.005 | |
| 55 – 64 yr (n=9,699) | 1.14 (1.09–1.20) | 1.12 (1.07–1.17) | Referent | <0.0001 | |
| ≥65 yr (n=3,017) | 1.07 (1.00–1.15) | 1.03 (0.96–1.10) | Referent | 0.054 | |
| Women, by BMI | <0.0001 | ||||
| <25.0 kg/m2(n=17,475) | 1.14 (1.09–1.20) | 1.08 (1.03–1.13) | Referent | <0.0001 | |
| 25 – 29.9 kg/m2(n=10,516) | 1.04 (0.99–1.10) | 1.01 (0.96–1.07) | Referent | 0.13 | |
| ≥30.0 kg/m2(n=6,088) | 1.04 (0.97–1.12) | 1.05 (0.97–1.14) | Referent | 0.37 | |
| Women, by smoking status | 0.69 | ||||
| Never smokers(n=17,692) | 1.13 (1.08–1.18) | 1.10 (1.05–1.15) | Referent | <0.0001 | |
| Former smokers (n=12,169) | 1.09 (1.03–1.14) | 1.06 (1.01–1.11) | Referent | 0.0009 | |
| Current smokers (n=4,186) | 1.07 (0.96–1.18) | 1.04 (0.92–1.17) | Referent | 0.23 | |
| Women, by menopausal status | 0.50 | ||||
| Premenopausal (n=9,821) | 1.10 (1.01–1.21) | 1.02 (0.93–1.12) | Referent | 0.03 | |
| Postmenopausal (n=17,762) | 1.11 (1.08–1.15) | 1.08 (1.05–1.13) | Referent | <0.0001 | |
a
Adjusted for age, baseline weight, height, time interval between weight assessments, race, education, smoking, menopausal status, hormone replacement therapy, hypertension, diabetes, alcohol consumption, and quintiles of intakes of total energy, saturated fat, and fruits and vegetables.
b
Interval during which weight change was assessed, mean ±SD = 2.88±0.41 yr.
c
See footnote to Table 1 regarding physical activity levels.
d
Number of women in the group at baseline.