Table 2.

Logistic regression results for exposure to racial violence incidents and national interest by gestational period as predictors of PTB odds for Black mothers (n = 1,600,619).

Any racial incident by period (none = ref.)	Model 1A		Model 1Ba		Model 1Cb
	OR	95% CI	OR	95% CI	OR	95% CI
Preconception	0.99	[0.97, 1.01]	1.00	[0.98, 1.02]	1.02	[0.99, 1.04]
First trimester	1.05	[1.02, 1.07]	1.05	[1.02, 1.07]	1.00	[0.98, 1.03]
Second trimester	0.99	[0.96, 1.02]	0.99	[0.96, 1.02]	1.00	[0.97, 1.04]
Third trimester	1.01	[0.99, 1.03]	1.02	[1.00, 1.03]	1.00	[0.98, 1.02]
National interest by period (log10 scale)	Model 2A		Model 2Ba		Model 2Cb
Preconception	0.99	[0.98, 0.99]	0.99	[0.98, 1.00]	1.00	[0.99, 1.01]
First trimester	1.02	[1.02, 1.03]	1.03	[1.02, 1.03]	1.00	[0.99, 1.01]
Second trimester	0.99	[0.98, 1.00]	0.99	[0.98, 1.00]	1.00	[0.99, 1.01]
Third trimester	0.99	[0.98, 1.00]	0.99	[0.98, 1.00]	1.00	[0.99, 1.00]

Note. Bolded odds ratios are significant at p < .05. All models adjusted for infant sex, maternal age, parity, prior preterm birth, change in unemployment rate, season of conception, and yearly trend, unless specified.

^aFurther adjusted for maternal education, marital status/paternity acknowledgment, insurance coverage at delivery, and cigarette smoking in pregnancy.

^bCalendar month of conception fixed effects are included in place of season of conception.