Table 3. Odd ratios of central obesity according to different levels of indoor and outdoor physical activity, TV watching and sleeping time.
| No. of participants | No. of cases | Odd ratios (95% confidence intervals) | ||
|---|---|---|---|---|
| Model 1* | Model 2† | |||
| Indoor activity categories (hours/day) | ||||
| <5.0 | 407 | 47 | 1.00 | 1.00 |
| 5.0–6.9 | 410 | 35 | 0.67 (0.39–1.13) | 0.68 (0.40–1.15) |
| ≥7.0 | 446 | 44 | 0.86 (0.51–1.45) | 0.89 (0.53–1.51) |
| P for trend | 0.30 | 0.31 | ||
| Indoor activity as a continuous variable (1 hour/day increase) | 0.98 (0.89–1.08) | 0.98 (0.89–1.09) | ||
| Outdoor activity categories (hours/day) | ||||
| <1.5 | 422 | 45 | 1.00 | 1.00 |
| 1.5–1.9 | 322 | 27 | 0.72 (0.43–1.21) | 0.75 (0.44–1.26) |
| ≥2.0 | 519 | 54 | 1.01 (0.65–1.56) | 1.02 (0.65–1.59) |
| P for trend | 0.36 | 0.44 | ||
| Outdoor activity as a continuous variable (1 hour/day increase) | 0.98 (0.80–1.20) | 0.99 (0.78–1.24) | ||
| TV watching time categories (hours/day) | ||||
| 0 | 446 | 35 | 1.00 | 1.00 |
| <1.0 | 453 | 42 | 1.28 (0.78–2.08) | 1.26 (0.77–2.06) |
| ≥1.0 | 364 | 49 | 1.76 (1.08–2.88) | 1.73 (1.05–2.84) |
| P for trend | 0.071 | 0.089 | ||
| TV watching time as a continuous variable (1 hour/day increase) | 1.25 (1.05–1.48) | 1.24 (1.04–1.47) | ||
| Sleeping time categories (hours/day) | ||||
| <11.0 | 469 | 53 | 1.00 | 1.00 |
| 11.0–11.9 | 386 | 39 | 1.02 (0.64–1.63) | 1.07 (0.67–1.72) |
| ≥12.0 | 408 | 34 | 0.77 (0.46–1.27) | 0.83 (0.50–1.39) |
| P for trend | 0.48 | 0.61 | ||
| Sleeping time as a continuous variable (1 hour/day increase) | 0.91 (0.76–1.08) | 0.92 (0.77–1.10) | ||
Center obesity was defined as more than the 90th percentiles for age and gender specific distribution of waist circumference.
*Adjusted for maternal age, pre-pregnancy BMI, weight gain during pregnancy, education, occupation, family income, and child age, sex, gestational age, and mode of infant feeding.
†Adjusted for variables in Model 1 and also indoor activity, outdoor activity, TV watching time, and sleeping time, other than the variable in the analyses.