Table 2. Birth Outcomes and Maternal Care Before and After Propensity Score Matching.
| Outcomes | Prevalence of events, No./total No.a | Between-group difference, percentage point (95% CI) | ||
|---|---|---|---|---|
| SB | Usual care | Before matchingb | After matchingc | |
| Preterm (<37 wk) | 144/1086 (13.3) | 14 984/124 166 (12.1) | 1.2 (−0.9 to 3.3) | −2.2 (−4.1 to −0.3) |
| Very preterm (<32 wk) | 19/1086 (1.8) | 2542/124 166 (2.1) | −0.3 (−1.0 to 0.4) | −1.2 (−2.0 to −0.4) |
| Low birth weight (<2500 g) | 140/1086 (12.9) | 10 247/124 151 (8.3) | 4.6 (2.5-6.8) | 1.5 (−0.03 to 3.0) |
| Very low birth weight (<1500 g) | 12/1086 (1.0) | 1451/124 151 (1.2) | −0.1 (−0.6 to 0.5) | −0.8 (−1.3 to −0.3) |
| Adequate care and plus | 786/1055 (74.5) | 89 789/119 332(75.2) | −0.7 (−3.3 to 1.8) | 3.1 (0.6-5.6) |
| Postpartum care (in 3 wk) | 471/1086 (43.4) | 22 887/124 166 (18.4) | 24.9 (21.5-28.3) | 21.0 (8.5-33.5) |
| Postpartum care (in 60 d) | 938/1086 (86.4) | 75 250/124 166 (60.6) | 25.8 (23.7-27.8) | 23.8 (9.7-37.9) |
Abbreviation: SB, Strong Beginnings
a
Observed prevalence before matching.
b
The difference between the control mean and the intervention mean may not equal the difference column before matching because of rounding.
c
The difference is based on kernel matching on baseline covariates with exact match on Black and Hispanic participants and regression adjustments for gestational diabetes and gestational hypertension using cross-validated bandwidth selection and bootstrapped standard errors. False discovery rate–sharpened Q values and standard errors are calculated to report 95% CIs.