Table 3.
Unadjusted and adjusted results for preterm birth among commercially-insured women, United States, 2011
| Variable | Model 1 (unadjusted) | Model 2 (minimally adjusted)a | Model 3 (fully adjusted)b | ||||||
|---|---|---|---|---|---|---|---|---|---|
| OR | 95% CI | P value | OR | 95% CI | P value | OR | 95% CI | P value | |
| Area-level deprivation | |||||||||
| Quartile 1 (least deprived) | 1.0 | 1.0 | 1.0 | ||||||
| Quartile 2 | 1.112 | 1.037,1.193 | 0.003 | 1.115 | 1.039,1.196 | 0.003 | 1.096 | 1.021, 1.176 | 0.011 |
| Quartile 3 | 1.152 | 1.074,1.235 | < 0.001 | 1.143 | 1.064,1.228 | < 0.001 | 1.113 | 1.035, 1.195 | 0.004 |
| Quartile 4 (most deprived) | 1.328 | 1.241,1.421 | < 0.001 | 1.322 | 1.233,1.417 | < 0.001 | 1.249 | 1.165, 1.339 | < 0.001 |
a Generalized estimating equation model results controlling for age at delivery and census division
b Generalized estimating equation model results controlling for age at delivery, census division, hypertension, gestational diabetes, pre-existing diabetes, infection, incompetent cervix, poor obstetric history, premature rupture of membranes, mode of delivery, substance use, and mental health conditions
OR odds ratio, CI confidence interval