Table 3.

Matched adjusted analysis of factors associated with a preterm and cesarean delivery among women with a documented delivery from a large healthcare system’s electronic health record from April 1, 2012 to September 30, 2019.

	Preterm delivery matched cohort (n = 2097)				Cesarean delivery matched cohort (n = 2148)
Parameter	B	SE (B)	Adjusted odds ratio (95% CI)	χ2	B	SE (B)	Adjusted odds ratio (95% CI)	χ2
Age at delivery (ranges 18–44)					0.05	0.01	1.05 (1.03–1.07)	33.47***
Race/ethnicity
Hispanic/Latina	0.01	0.17	1.48 (0.92–2.36)	0.00
Non-Hispanic/Latina Black	0.20	0.15	1.79 (1.17–2.73)	1.67
Othera	0.18	0.11	1.76 (1.30–2.38)	2.83
Non-Hispanic/Latina White	–
Marital status
Single					−0.04	0.09	1.17 (0.96–1.44)	0.16
Divorced, separated, and widowed					0.23	0.15	1.54 (0.96–2.45)	2.29
Married
Body Mass Index at delivery	−0.03	0.01	0.98 (0.96–0.99)	1.18**	0.05	0.01	1.05 (1.04–1.07)	63.25***
Substance-related diagnosis
Yes	0.27	0.07	1.84 (1.41–2.39)	16.10***	0.20	0.05	1.51 (1.23–1.85)	15.60***
No	–				–
Serious mental illness
Yes					0.09	0.09	1.20 (0.85–1.69)	1.03
No					–
Preexisting health condition
Yes	0.30	0.07	1.73 (1.32–2.26)	20.29***	0.26	0.05	1.67 (1.39–2.01)	30.21***
No	–				–

Notes: B, standardized betas, SE (B), standard errors; and CI, confidence interval.

Only variables significant in the unadjusted (bivariate) regression models (Tables 1 and 2) were included in the adjusted (multivariable) regression models (Table 3) for each outcome variable (preterm delivery, cesarean delivery). As such, the variables included for the preterm delivery cohort (left side of this table) differ from the variables included in the cesarean delivery cohort (right side of this table).

^aOther race/ethnicity includes American Indian/Alaskan Native (n = 15), Asian/Pacific Islander (n = 141), and other race or mixed race/ethnicity (n = 659).

^*P ≤ 0.05.

^**P ≤ 0.01.

^***P ≤ 0.001.