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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Med Care. 2020 Sep;58(9):757–762. doi: 10.1097/MLR.0000000000001373

Table 4.

Two-Part Difference-in-Difference Analysis of Medication Expansion Impact on Outpatient Mental Health Care Use and Number of Visits among Users

Non-ME States ME States DID Adjusted DID
Pre Post P-P Dif. Pre Post P-P Dif.
Odds of One or More Visit per Year 1
Average (odds/OR) 0.074 0.092 1.256 0.102 0.133 1.310 1.043 0.992
SE 0.003 0.007 0.110 0.003 0.007 0.082 0.112 0.116
p-value p=.209 p=.190 p=.297 p=.942
Average Annual Number of Visits Among Users
Average 6.392 5.940 −0.452 9.665 12.750 3.086 3.538 3.140
SE 0.263 0.576 0.633 0.605 1.690 1.795 1.903 1.880
p-value p=.475 p=.086 p=.063 p=.096

ME=Medicaid Expansion; DID=Difference in Differences; P-P Dif.= Pre-Post Difference; OR=Odds Ratio; SE=Standard Error.

1

Results for ‘Any Visits’ estimated in logistic regression models with adjustment for age, sex, marital status, educational attainment and race/ethnicity. Pre- and Post- values are presented as odds of having one or more visits and P-P Dif. values are presented as odds ratios. DID values are ratios of odds ratios.