Table 3.

Interrupted time series analysis of monthly rates of LARC initiation among women with contraceptive claims, 2010–2013

	January 2013 as intervention point		April 2013 as intervention point*
Characteristic	Beta coefficient	p-value	Beta coefficient	p-value
Intercept	−4.78	<0.001	−6.17	<0.001
Overall change in trend by month	0.02	<0.001	0.02	<0.001
After ACA change in level	−0.004	0.58	0.06	<0.001
After ACA change in trend by month	−0.004	<0.001	−0.02	<0.001
Age group
18–25 years	Reference
26–35 years	0.60	<0.001	0.60	<0.001
36–45 years	0.70	<0.001	0.70	<0.001
Region
Northeast	Reference
Midwest	0.09	<0.001	0.09	<0.001
South	0.18	<0.001	0.18	<0.001
West	0.37	<0.001	0.37	<0.001
Unknown	0.23	<0.001	0.23	<0.001
Health plan type
Comprehensive	−0.12	<0.001	−0.12	<0.001
Exclusive provider organization and health maintenance organization	0.06	<0.001	0.06	<0.001
Point-of-Service	−0.03	<0.001	−0.03	<0.001
Preferred-provider organization	Reference		Reference
Consumer-driven and high-deductible health plans	−0.12	<0.001	−0.13	<0.001
Missing	−0.23	0.001	−0.23	<0.001
Quarter of year
Quarter 1	−0.24	<0.001	−0.25	<0.001
Quarter 2	−0.17	<0.001	−0.19	<0.001
Quarter 3	−0.006	0.09	−0.02	<0.001
Quarter 4	Reference

ACA=Affordable Care Act

^*Sensitivity analysis performed to address possible delayed adoption of the ACA contraceptive mandate