Table 2.
Maternal predictors of longer hospital stay by newborn.
| Comparison | Odds ratio (95% CI) | P |
|---|---|---|
| Smoked before pregnancy only/never smoked | 1.141 (0.991–1.313) | 0.0668 |
| Smoked before and during pregnancy/never smoked | 1.137 (0.987–1.308) | 0.0745 |
| Age | 1.033 (1.023–1.043) | <0.0001 |
| First live birth/previous live birth | 1.626 (1.477–1.789) | <0.0001 |
| Not married/married | 1.105 (0.979–1.248) | 0.1069 |
| Education ≤ 12 yrs/> 12 yrs | 0.923 (0.827–1.031) | 0.1560 |
| Prepregnancy BMI | 1.035 (1.028–1.042) | <0.0001 |
| Annual HH income ≤ $20 k/> $20 k | 1.307 (1.151–1.486) | <0.0001 |
| Urban or suburban/rural town or isolated rural | 0.962 (0.879–1.054) | 0.4074 |
| Nonwhite/white | 0.787 (0.596–1.040) | 0.0921 |
| Drank alcohol prior to pregnancy/did not drink alcohol | 0.909 (0.824–1.004) | 0.0593 |
| Drank alcohol in last 3 months of pregnancy/did not drink | 0.961 (0.800–1.155) | 0.6737 |
| Gestational age when being sure she is pregnant | 0.999 (0.984–1.014) | 0.9104 |
| Gestational age at first prenatal visit | 0.995 (0.981–1.009) | 0.4786 |
| Pregnancy weight gain < recommended/recommended | 1.066 (0.943–1.205) | 0.3046 |
| Pregnancy weight gain > recommended/recommended | 1.124 (1.015–1.107) | 0.0248 |
Logistic regression results with length of infant hospitalization as the dependent variable: infants were more likely to spend longer time in the hospital if mother was older, was having her first birth, had a higher prepregnancy BMI, lived in a household with an annual income < $20,000/year, or had a gestational weight gain > recommended range (compared to within recommended range).