Table 4.
Adjusted linear regression coefficients assessing the joint association between average PA (steps/day) and CRF in pregnancy and birthweight (g).
| Parameter estimates |
|||
|---|---|---|---|
| Predictors | β | SE | p-Value |
| Primary exposures | |||
| Average PA (steps/day) | −0.09 | 0.12 | 0.4441 |
| CRF (ml O2∙kg−1 min−1) at 17 weeks | −52.23 | 41.45 | 0.2111 |
| Average PA*CRF | 0.006 | 0.006 | 0.2929 |
| Covariates | |||
| Maternal age (y) | 7.38 | 12.11 | 0.5439 |
| Gestational age (weeks) | 143.64 | 30.17 | <0.0001 |
| Gestational weight gain (17 to 28 weeks) | 11.30 | 7.31 | 0.1268 |
| Group allocation | |||
| Exercise | −9.30 | 132.75 | 0.9443 |
| Stretching (referent) | – | – | – |
*Gestational weight gain represents weight gain during 17 weeks and 28 weeks of gestation (corresponding to participant laboratory visits).