Table 3.

Association between IBH intervention and cost.

	Comparison		Intervention
Outcome	Pre	Post	Pre	Post	Difference-in-differences
Total cost of care
Model: Part I	0.685	0.695	0.709	0.704	0.922∗∗∗ (0.891 to 0.955)
Model: Part II	1320.7	1464.3	1123.5	1228.6	−38.556 (−135.2 to 58.1)
Inpatient
Model: Part I	0.019	0.022	0.015	0.016	0.953 (0.875 to 1.037)
Model: Part II	24299.4	18883.2	26845.7	20517.2	−912.1 (−4546.6 to 2722.3)
Outpatient
Model: Part I	0.210	0.200	0.222	0.202	0.936∗∗∗ (0.908 to 0.965)
Model: Part II	682.3	650.1	651.0	625.2	6.260 (−37.3 to 49.8)
Professional
Model: Part I	0.508	0.494	0.519	0.488	0.926∗∗∗ (0.900 to 0.952)
Model: Part II	493.6	477.3	444.7	422.8	−5.7 (−20.8 to 9.5)
Pharmacy
Model: Part I	0.504	0.567	0.514	0.569	0.966∗∗(0.936 to 0.996)
Model: Part II	260.6	350.0	195.4	264.9	−19.9 (−48.7 to 8.9)

Part I models the probability of observing non-zero costs while part II models the level of costs for those with non-zero costs. Difference-in-differences estimates for part I represent odds ratios while for part II represent mean marginal monthly cost per person. IBH = integrated behavioral health. The size of N, which represents the # of person-months during the study window, for part I is 1,510,786 and for part II, averages 655,059 across the 5 cost measures considered. IBH = Integrated Behavioral Health.

^∗∗P < 0.01.

^∗∗∗P < 0.001.