Table 3.
Hazard ratios (95% confidence intervals) for incident obesity according to level of physical activity
| Amount of Weekly Physical Activity | Cases | Crude Incidence Rate (cases/10,000 person years) |
Age-adjusted | Multivariable Model§ |
Multivariable Model + BMI* |
|
|---|---|---|---|---|---|---|
| Moderate Physical Activity | ||||||
| None | 47 | 35.7 | 1.0 | 1.0 | 1.0 | |
| <1000 kilocalories | 463 | 29.8 | 0.83 (0.61–1.12) | 0.88 (0.64–1.20) | 0.89 (0.65–1.22) | |
| 1000–2000 kilocalories | 104 | 29.8 | 0.83 (0.59–1.17) | 0.84 (0.58–1.21) | 0.81 (0.56–1.17) | |
| >2000 kilocalories | 28 | 35.5 | 1.03 (0.64–1.64) | 1.05 (0.64–1.71) | 0.94 (0.58–1.54) | |
| p for trend | 0.67 | 0.86 | 0.63 | |||
| Vigorous Physical Activity | ||||||
| None | 395 | 33.8 | 1.0 | 1.0 | 1.0 | |
| <1000 kilocalories | 243 | 28.8 | 0.84 (0.72–0.99) | 0.90 (0.77–1.07) | 0.94 (0.79–1.10) | |
| 1000–2000 kilocalories | 49 | 26.6 | 0.78 (0.58–1.05) | 0.76 (0.55–1.04) | 0.79 (0.58–1.08) | |
| >2000 kilocalories | 32 | 25.6 | 0.76 (0.53–1.09) | 0.75 (0.51–1.10) | 0.89 (0.61–1.31) | |
| p for trend | 0.05 | 0.05 | 0.25 | |||
| Total Physical Activity | ||||||
| <500 kilocalories | 337 | 34.5 | 1.0 | 1.0 | 1.0 | |
| 500–1000 kilocalories | 131 | 26.6 | 0.77 (0.63–0.94) | 0.80 (0.65–0.98) | 0.78 (0.64–0.97) | |
| 1000–2000 kilocalories | 154 | 29.4 | 0.85 (0.70–1.03) | 0.85 (0.69–1.04) | 0.83 (0.68–1.02) | |
| 2000–3000 kilocalories | 57 | 31.6 | 0.93 (0.70–1.23) | 0.93 (0.70–1.24) | 0.95 (0.71–1.28) | |
| >3000 kilocalories | 40 | 27.5 | 0.80 (0.58–1.11) | 0.74 (0.52–1.06) | 0.81 (0.57–1.15) | |
| p for trend | 0.17 | 0.12 | 0.25 | |||
§
Multivariable Model adjusted for age, alcohol, smoking, hormone replacement therapy, postmenopausal status, randomization arm, total caloric intake and dietary factors (saturated fat, low-fat dairy, high-fat dairy, red meat, poultry, whole grain, and fiber intake)
*
Baseline BMI