| | Preterm (< 37 weeks gestation), n = 718 |
|---|
Past-year | N | (%) | OR (95% CI)a | OR (95% CI) a | OR (95% CI) a |
| | | | Model 1b | Model 2c | Model 3d |
Light LTPA | | | | | |
< 3 h/wk | 6365 | 5.7 | 1.0 | 1.0 | 1.0 |
> 3 h/wk | 6074 | 5.2 | 0.88 (0.74–1.04) | 0.94 (0.78–1.12) | 0.86 (0.71–1.04) |
Vigorous LTPA | | | | | |
None | 6426 | 5.4 | 1.0 | 1.0 | 1.0 |
1–2 | 3865 | 5.2 | 0.96 (0.79–1.16) | 1.04 (0.85–1.27) | 1.06 (0.85–1.31) |
> 3 h/wk | 2096 | 5.5 | 1.03 (0.81–1.31) | 1.17 (0.91–1.50) | 1.31 (1.00–1.71) |
- CI Confidence intervals, LTPA Leisture-time physical activity, OR Odds ratio, wk Week
- aLogisticregression models entering mothers’ pseudo-ID as cluster variable.
- bModel 1 includes Cohort Norway baseline age and time to delivery, and parity risk (nulliparous, prior preterm among parous, and parous without prior preterm delivery).
- cModel 2 includes model 1 covariates, and height (cm), body mass index (kg/m2) status (underweight: < 18.5; normal/overweight: 18.5–29.9, and obese), daily cigarette smoking (yes vs. no), educational level (primary, high school/vocational school, any college/university).
- dModel 3 includes model 2 covariates and simultaneously light and vigorous leisure-time physical activity.
