Table 3.
Associations of leisure time physical activity trajectory groups with categorical birthweight
| N | SGA | N | LGA | |||
|---|---|---|---|---|---|---|
| Odds Ratio (95% CI) | Odds Ratio (95% CI) | |||||
| Model Ia | Model IIb | Model Ia | Model IIb | |||
| Leisure time physical activity trajectory | ||||||
| OVERALL | ||||||
| 1 (decreasing from low activity) | 76/922 | Reference | Reference | 139/922 | Reference | Reference |
| 2 (decreasing from high activity) | 24/376 | 0.85 (0.39, 1.87) | 0.86 (0.39, 1.89) | 64/376 | 1.07 (0.98, 1.69) | 1.08 (0.69, 1.70) |
| 3 (increasing activity) | 10/74 | 1.71 (0.70, 4.20) | 1.89 (0.74, 4.84) | 13/74 | 1.07 (0.46, 2.46) | 1.03 (0.46, 2.33) |
| FEMALES | ||||||
| 1 (decreasing from low activity) | 37/462 | Reference | Reference | 64/462 | Reference | Reference |
| 2 (decreasing from high activity) | 9/172 | 0.81 (0.26, 2.52) | 0.75 (0.23, 2.41) | 33/172 | 1.72 (0.94, 3.14) | 1.83 (0.98, 3.41) |
| 3 (increasing activity) | 6/41 | 1.28 (0.35, 4.70) | 1.54 (0.35, 6.86) | 5/41 | 0.38 (0.11, 1.33) | 0.40 (0.12, 1.33) |
| MALES | ||||||
| 1 (decreasing from low activity) | 39/460 | Reference | Reference | 75/460 | Reference | Reference |
| 2 (decreasing from high activity) | 15/204 | 0.75 (0.32, 1.78) | 0.74 (0.31, 1.77) | 31/204 | 0.69 (0.40, 1.21) | 0.68 (0.39, 1.18) |
| 3 (increasing activity) | 4/33 | 2.51 (0.61, 10.3) | 2.49 (0.62, 10.0) | 8/33 | 1.84 (0.74, 4.62) | 1.66 (0.65, 4.21) |
| NORMAL WEIGHT | ||||||
| 1 (consistently moderate activity) | 3/40 | 1.10 (0.18, 6.76) | Reference | 8/40 | 2.33 (0.71, 7.67) | Reference |
| 2 (decreasing from low activity) | 33/355 | Reference | - | 44/355 | Reference | - |
| 3 (decreasing from high activity) | 17/218 | 1.11 (0.51, 2.42) | - | 35/218 | 2.03 (1.06, 3.88) | - |
| 4 (increasing from high activity)c | - | - | - | 6/41 | 0.52 (0.15, 1.87) | - |
| OVERWEIGHT/OBESE | ||||||
| 1 (consistently low activity) | 35/450 | Reference | Reference | 76/450 | Reference | Reference |
| 2 (decreasing activity) | 8/179 | 0.54 (0.21, 1.37) | - | 37/179 | 1.11 (0.58, 2.14) | - |
| 3 (increasing activity) | 6/39 | 2.23 (0.42, 11.9) | - | 8/39 | 1.51 (0.62, 3.68) | - |
P value for interaction with of LTPA trajectory with offspring sex: SGA Model I=0.89, SGA Model II=0.84; LGA Model I=0.008, LGA Model II=0.007
Model I 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.
Model II is adjusted for all covariates in Model I and pre-pregnancy BMI category (underweight/normal weight/overweight/obese).
Number of SGA in this category is too small (<3), so cannot show estimate according to Add Health rules.