TABLE 3—
As-Treated Results, Derived From Number of Group Prenatal Care Visits Attended: Group Prenatal Care Study; New York, NY; 2009–2012
| Outcome | AORa (95% CI) |
| Birth or neonatal | |
| Preterm birth at < 37 wk | 0.76 (0.69, 0.84) |
| Low birth weight, < 2500 g | 0.81 (0.73, 0.89) |
| Small for gestational age | 0.91 (0.85, 0.99) |
| Breastfeeding initiation | 1.03 (0.93, 1.14) |
| Admitted to NICUb | 0.93 (0.86, 1.01) |
| Reproductive health | |
| Laboratory-tested STI (CT or NG)c | 1.04 (0.94, 1.15) |
| Rapid repeat pregnancy | 0.88 (0.80, 0.97) |
Note. AOR = adjusted odds ratio; CI = confidence interval; CT = Chlamydia trachomatis; NICU = neonatal intensive care unit; NG = Neisseria gonorrheae; STI = sexually transmitted infection. Population size was n = 1148. Analyses were on the basis of the actual number of group prenatal care visits attended, regardless of study condition. All patients at clinical sites randomized to individual care received a “0” for number of group visits as did those who were at clinical sites randomized to group care but never attended (n = 127).
Analyses controlled for correlates of group visit attendance: born outside United States, living situation, nulliparous, gestational age at study entry, and individual care prenatal visits.
Not registered as primary outcome but included as driver of cost. Number of days in the NICU was associated with number of group visits: each increase in the number of group prenatal care visits attended reduced the number of days in the NICU by 0.30 (B [SE] = −0.30 [0.02]; P < .001).
Restricted to women with laboratory testing for CT and NG 1 year postpartum.