TABLE 1—

Characteristics of Intervention and Matched Comparison Groups for Study Participants: New York City, 2015–2016

	Before Propensity Score Matching			After Propensity Score Matching Comparison Group (Enrollment n = 754), Mean or % (No.)
	Matching Variable	Intervention Group (Enrollment n = 506), Mean or % (No.)	Comparison Group (Enrollment n = 50 487), Mean or % (No.)	Standardized Difference
Age, y	28.91	29.11	0.035	29.03
Language
English	70.4 (356)	63.9 (32 283)	0.137	70.6 (714)
Spanish	29.1 (147)	25.2 (12 742)	0.086	28.7 (290)
Other	0.6 (3)	10.8 (5 462)	0.452	0.4 (4)
Clinical high risk
Diabetes	10.47 (53)	12.69 (6 408)	0.069	11.17 (113)
Hypertension	12.65 (64)	6.59 (3 328)	0.206	11.26 (114)
Mental illness	2.96 (15)	2.7 (1 365)	0.016	2.57 (26)
Predelivery enrollment days	356.66	351.66	9	345.14

Note. UHF = United Hospital Fund. UHF zip code results not shown; matching based on UHF neighborhood codes was successful (standardized difference < 0.2).