Table 1.

Attrition Table for Model Development and Model Validation.

	Inclusion/Exclusion Criteria	Population
1	All Veterans 65+ years of age during the study period (January 1, 2012, to January 31, 2015)	8,050,371
2	Study population randomly split in half	4,025,184 (Modeling) 4,025,187 (Validation)
3	Veterans with two or more mental-health related diagnoses or at least one mental-health related drug fill during the study period	1,161,732 (Modeling) 1,977,147 (Validation)
4	Veterans with a sufficient eligibility window to support a randomly selected index date in between 365 days of baseline and 90 days of follow-up	940,416 (Modeling) 1,427,473 (Validation)
5	Veterans that experienced a psychiatric hospitalization during follow-up	1,936 (Modeling) 1,793 (Validation)