Evaluation of a Tennessee statewide initiative to reduce early elective deliveries using quasi-experimental methods

Table 2 Interrupted-time series analysis of intervention to reduce EEDs for overall sample and by cohort

	Pre-Intervention Quarterly Trend		Intervention Change		Post-Intervention Quarterly Trend		Change in Quarterly Trend
	Adjusted Odds Ratio ^a (95% CI)	P-value	Adjusted Odds Ratio ^a (95% CI)	P-value	Adjusted Odds Ratio ^a (95% CI)	P-value	Adjusted Odds Ratio ^a (95% CI)	P-value
Overall	0.97 (0.96–0.98)	< 0.0001	0.72 (0.61–0.86)	0.0002	0.99 (0.98–1.07)	0.3679	1.03 (1.01–1.04)	0.0012
Cohort 1	0.95 (0.93–0.97)	< 0.0001	0.57 (0.40–0.80)	0.0012	0.99 (0.96–1.01)	0.3070	1.03 (1.00–1.07)	0.0439
Cohort 2	0.94 (0.92–0.97)	< 0.0001	0.36 (0.24–0.53)	< 0.0001	1.02 (0.99–1.05)	0.1198	1.09 (1.05–1.13)	< 0.0001
Cohort 3	0.98 (0.97–1.00)	0.0136	0.88 (0.70–1.10)	0.2655	1.00 (0.98–1.02)	0.8783	1.02 (0.99–1.04)	0.1613

^aModels are adjusted for maternal age (in years), race (white vs. black or other), Hispanic ethnicity (yes vs. no), less than high school education (yes vs. no), insurance type (private vs. Medicaid or other), annual income <$25,000 vs $25,000+, less than five vs. five or more prenatal visits, and nulliparous vs. multiparous

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