Table 2.
Odds ratios and 95 % confidence intervals for pre-term birth
| Variablea | Unadjusted | Primary model: adjusts for non-modifiable risk-factor covariatesb | Secondary model: adjusts for all risk-factor covariatesc |
|---|---|---|---|
| CHAP versus non-CHAP | 0.43 (0.16, 1.07) | 0.36 (0.12, 0.96) | 0.37 (0.12, 1.02) |
| Age | |||
| <16 versus >18 | 1.58 (0.40, 6.28) | 1.17 (0.42, 6.70) | |
| 16–18 versus >18 | 2.13 (0.66, 6.85) | 2.11 (0.65, 6.84) | |
| African-American versus White | 1.13 (0.35, 3.70) | 0.93 (0.28, 3.09) | |
| Not married versus married | 3.06 (0.87, 10.0) | 4.11 (1.06, 15.92) | |
| Previous preterm or LBW delivery | 3.06 (0.50, 18.52) | 3.44 (0.55, 21.43) | |
| Tobacco use | 4.76 (1.92, 11.84) | 5.09 (2.01, 12.87) | |
| Hypertension | 6.25 (0.91, 43.16) | ||
aCensus tract comparisons excluded
bMother’s age (<16, 16–18, >18), race (African-American, white), marital status, census tract, previous preterm or LBW delivery, tobacco use at any time during pregnancy (y/n)
cAll from primary model and additionally hypertension (chronic and/or pregnancy-associated)