Table 3.
Multiple regression analysis of birthweight (regression coefficients and 95% confidence intervals; base n = 115)
| Step 1 | Step 2 | Step 3 | |
|---|---|---|---|
| Preconception variables | |||
| Perceived health status (high) | −86.3 (−388.4,215.8) | −19.5 (−311.7, 272.9) | −29.8 (−370.3, 310.7) |
| BMI (overweight/obese) | 327.8 (73.3, 582.4) | 400.1 (138.5, 661.6) | 370.9 (89.4, 652.4) |
| Psychosocial Hassles (high) | −155.7 (−399.4, 87.9) | −138.7 (−370.0, 92.7) | −106.3 (−357.0, 144.4) |
| Smokes cigarettes | −152.2 (−479.1,174.8) | −135.4 (−519.6, 248.7) | −141.9 (−569.3, 285.5) |
| Uses alcohol | −14.5 (−266.1, 237.0) | −89.9 (−315.6, 135.8) | −76.5 (−320.7, 167.7) |
| Uses daily multivitamin, folic acid | 98.3 (−169.5, 366.0) | 42.8 (−218.0, 303.6) | 33.3 (−231.5, 298.1) |
| Consumes vegetables daily | 295.0 (24.5, 565.5) | 351.7 (80.4, 622.9) | 345.6 (37.6, 653.6) |
| Consumes fruit daily | −147.9 (−493.0, 197.1) | −152.9 (−484.8, 179.0) | −165.0 (−538.8, 208.8) |
| Physical activity level meets recommendations | 261.8 (−70.0, 593.6) | 292.2 (−48.4, 632.7) | 319.5 (−30.3, 669.4) |
| Prenatal variables | |||
| Smokes cigarettes | −225.4 (−898.2, 447.5) | −217.9 (−859.2, 423.5) | |
| Uses daily multivitamin, folic acid | 167.6 (−211.3, 546.5) | 130.6 (−270.6, 531.7) | |
| Pregnancy weight gain (pounds) | 15.8 (7.1, 24.4) | 15.7 (6.6, 24.8) | |
| Sociodemographics | |||
| Age (years) | 14.5 (−11.6, 40.7) | ||
| Marital status (married/cohabitating) | −41.7 (−461.9, 378.5) | ||
| Education (some college or more) | 58.2 (−200.5, 316.9) | ||
| White, non-Hispanic | −46.6 (−626.8, 533.5) | ||
| Adjusted R2 | 0.10 | 0.23 | 0.21 |
Predictors with a small fraction of missing values (alcohol use at baseline and both folic acid use variables) were imputed by the mean values. Significant coefficients (P < 0.05) are in bold