TABLE 7.
Multivariable Analysis of Variables Associated With Low MDI
| Variables | <55 | 55–69 |
|---|---|---|
| Total sample (n = 921) | ||
| Gestational age 23–24 wk | 1.9 (0.97, 3.6) | 1.0 (0.5, 1.9) |
| Gestational age 25–26 wk | 1.2 (0.7, 2.1) | 0.8 (0.5, 1.3) |
| Single mother | 1.3 (0.7, 2.2) | 1.2 (0.7, 2.1) |
| BMI >30 | 1.9 (1.1, 3.1)a | 1.3 (0.9, 2.3) |
| Vaginal/cervical infection | 1.2 (0.6, 2.2) | 1.4 (0.8, 2.6) |
| Cesarean delivery | 0.8 (0.5, 1.2) | 0.8 (0.5, 1.4) |
| BWZ < –2 | 2.2 (1.5, 7.5)a | 1.9 (0.7, 4.8) |
| Male | 2.5 (1.6, 4.1)a | 2.0 (1.3, 3.2)a |
| Nonwhite race | 2.3 (1.4, 3.8)a | 2.1 (1.3, 3.5)a |
| Mother's education <12 y | 2.8 (1.6, 4.9)a | 0.9 (0.5, 1.8) |
| Mother's education >16 y | 0.8 (0.4, 1.5) | 0.7 (0.4, 1.2) |
| Total histology/BSID sample (n = 857) | ||
| Gestational age 23–24 wk | 1.9 (0.9, 3.9) | 1.1 (0.6, 2.1) |
| Gestational age 25–26 wk | 1.1 (0.6, 2.0) | 0.8 (0.4, 1.3) |
| Single mother | 1.2 (0.7, 2.2) | 1.2 (0.7, 2.0) |
| BMI >30 | 2.0 (1.1, 3.5)a | 1.2 (0.7, 2.1) |
| Vaginal/cervical infection | 1.2 (0.6, 2.4) | 1.4 (0.7, 2.7) |
| Cesarean delivery | 0.9 (0.5, 1.5) | 0.9 (0.5, 1.5) |
| BWZ < –2 | 2.8 (1.1, 6.9)a | 1.9 (0.7, 5.0) |
| Male | 2.7 (1.6, 4.5)a | 2.1 (1.3, 3.4)a |
| Thrombosis fetal vessels | 3.1 (1.2, 7.7)a | 0.6 (0.1, 2.5) |
| Increased syncytial knots | 1.4 (0.8, 2.5) | 1.5 (0.9, 2.5) |
| Nonwhite race | 2.2 (1.3, 3.8)a | 2.2 (1.3, 3.7)a |
| Mother's education <12 y | 3.4 (1.9, 6.2)a | 1.1 (0.6, 2.2) |
| Mother's education >16 y | 0.7 (0.4, 1.4) | 0.7 (0.4, 1.3) |
Risk ratios and 95% CIs. The referent group is infants with MDI ≥70. BWZ, birthweight z score.
a
p < .05.