Table 2.

Interrupted Time Series Regression Results on the Probability of Out-of-network Mental Health Service Use, Quantity of Out-of-network Services, and Total Out-of-network Spending 2007–2012

	Coefficient	Standard Error	P-Value
Share with any out-of-network mental health service use among mental health service users
Parity	−0.0305	0.001517	<0.001
Time	−0.0007	0.0000527	<0.001
Parity*Time	0.0006	0.0000744	<0.001
Average number of out-of-network mental health outpatient visits among out-of-network mental health service users
Parity	0.1164	0.0211	<0.001
Time	0.0017	0.0071	0.019
Parity*Time	0.0053	0.0010	<0.001
Average total out-of-network mental health spending among out-of-network mental health service users
Parity	49.1050	13.7305	0.001
Time	2.8294	0.4263	<0.0001
Parity*Time	−1.3412	0.6371	0.040

Notes

The unit of observation is the month/year (N = 72). All regressions include 11 dummy variables to control for month/seasonality

P-values reflect 2-sided tests