Table 2.
Associations of leisure time physical activity trajectory groups with birthweight
| N | Mean birthweight (g) |
Mean difference (95% CI) | ||
|---|---|---|---|---|
| Model Ia | Model IIb | |||
| Leisure time physical activity trajectory | ||||
| OVERALL | 1408 | |||
| 1 (decreasing from low activity) | 940 | 3293 | Reference | Reference |
| 2 (decreasing from high activity) | 391 | 3273 | 26 (−44, 96) | 25 (−44, 94) |
| 3 (increasing activity) | 77 | 3171 | −35 (−191, 120) | −48 (−202, 106) |
| FEMALESc | 691 | |||
| 1 (decreasing from low activity) | 468 | 3208 | Reference | Reference |
| 2 (decreasing from high activity) | 181 | 3178 | 90 (−4, 184) | 92 (−1, 186) |
| 3 (increasing activity) | 42 | 3067 | −73 (−258, 112) | −70 (−261, 121) |
| MALESc | 717 | |||
| 1 (decreasing from low activity) | 472 | 3375 | Reference | Reference |
| 2 (decreasing from high activity) | 210 | 3341 | −22 (−110, 67) | −27 (−113, 59) |
| 3 (increasing activity) | 35 | 3307 | 15 (−217, 246) | −10 (−230, 209) |
a
Model is adjusted for maternal age at delivery (years), race (non-Hispanic white/non-Hispanic black/Hispanic/other), parental income category (<$20K/$20-60K/>$60K), nulliparity (Y/N), smoking during pregnancy (Y/N), alcohol use during pregnancy (Y/N), gestational age at delivery (weeks), and offspring sex.
b
Model II is adjusted for all covariates in Model I and pre-pregnancy BMI category (underweight/normal weight/overweight/obese).
c
P value for interaction of LTPA trajectories with offspring sex= Model I: 0.10, Model II: 0.08