Cost-Effectiveness of Housing First With Assertive Community Treatment: Results From the Canadian At Home/Chez Soi Trial [2020]

Objective:
The At Home/Chez Soi trial for homeless individuals with mental illness showed scattered-site Housing First with Assertive Community Treatment (ACT) to be more effective than treatment as usual. This study evaluated the cost-effectiveness of Housing First with ACT and treatment as usual.

Methods:
Between October 2009 and June 2011, a total of 950 homeless individuals with serious mental illness were recruited in five Canadian cities: Vancouver, Winnipeg, Toronto, Montreal, and Moncton. Participants were randomly assigned to Housing First (N=469) or treatment as usual (N=481) and followed up for up to 24 months. The intervention consisted of scattered-site Housing First, using rent supplements, with ACT. The treatment-as-usual group had access to all other services. The perspective of society was adopted for the cost-effectiveness analysis. Days of stable housing served as the outcome measure. Retrospective questionnaires captured service use data.

Results:
Most (69%) of the costs of the intervention were offset by savings in other costs, such as emergency shelters, reducing the net annual cost of the intervention to about Can$6,311 per person. The incremental cost-effectiveness ratio was Can$41.73 per day of stable housing (95% confidence interval=Can$1.96–$83.70). At up to Can$60 per day, Housing First had more than an 80% chance of being cost-effective, compared with treatment as usual. Cost-effectiveness did not vary by participant characteristics.

Conclusions:
Housing First with ACT appeared about as cost-effective as Housing First with intensive case management for people with moderate needs. The optimal mix between the two remains to be determined.

Eric A. Latimer, Ph.D., Daniel Rabouin, M.Sc., Zhirong Cao, M.Sc., Angela Ly, M.H.A., Guido Powell, M.Sc., Tim Aubry, Ph.D., Jino Distasio, Ph.D., Stephen W. Hwang, M.D., M.P.H., Julian M. Somers, Ph.D., Ahmed M. Bayoumi, M.D., M.Sc., Craig Mitton, Ph.D., Erica E. M. Moodie, Ph.D., Paula N. Goering, R.N., Ph.D., For the At Home/Chez Soi Investigators
Psychiatric Services, 25 Aug 2020
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