The Canadian Journal of Psychiatry / La Revue Canadienne de Psychiatrie
2023, Vol. 68(9) 701© The Author(s) 2023Article reuse guidelines:sagepub.com/journals-permissionsDOI: 10.1177/07067437231173818TheCJP.ca | LaRCP.ca
Dear editor of the Canadian Journal of Psychiatry,
The figures we reported as incidence are actually annual prevalence.
The incidence figures are about 10 times lower in 2016. The incidence crude rates per 100,000 inhabitants with their 95% confidence intervals (CIs) and relative risks (RRs) were for males: 78 (73–84) in Montreal versus 53 (51–56) in the rest of Quebec, with an RR of 1.47; for females: 68 (62–73) in Montreal versus 43 (41–46) in the rest of Quebec, with an RR of 1.58; for both males and females: 73 (69–77) in Montreal versus 48 (46–50) in the rest of Quebec, with an RR of 1.52. The nonoverlapping 95% CI indicates a significantly 50% higher incidence in Montreal, and a statistically significant higher incidence in both males and females in Montreal compared to the rest of Quebec.
Both annual prevalence and incidence figures confirm a higher proportion of people with schizophrenia in large urban areas like Montreal and shall be taken into account in equitable resource allocation of specialist resources.
The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was partly supported by a Quebec Health Research Fund (FQRS) peer-reviewed grant from Janssen (division of Johnson & Johnson) and the Ministère de l’Économie et de l’Innovation (MEI), within the framework of Données de recherche en contexte réel - Partenariat Innovation-Québec-Janssen (PIQJ).
Alain Lesage https://orcid.org/0000-0002-4226-4683
1Research Centre, Institut universitaire en santé mentale de Montréal (IUSMM), Montréal (QC), Canada
2Département de Psychiatrie et d’Addictologie, Université de Montréal, Montréal (QC), Canada
3Groupe de recherche PRIMUS, Centre de recherche du Centre hospitalier universitaire de Sherbrooke (CRCHUS), Sherbrooke (QC), Canada
4 Département de médecine de famille et de médecine d’urgence, Université de Sherbrooke, Sherbrooke (QC), Canada
Corresponding author:Alain Lesage, MD, Mphil, Centre de recherche de l’Institut universitaire en santé mentale de Montréal, 7401 Hochelaga, Montréal (QC), Canada H1N 3M5.Email: alesage.iusmm@ssss.gouv.qc.ca