@article{ref1,
title="How high? Trends in cannabis use prior to first admission to inpatient psychiatry in Ontario, Canada, between 2007 and 2017",
journal="Canadian journal of psychiatry, The",
year="2020",
author="McGuckin, Taylor and Ferro, Mark A. and Hammond, David and Stewart, Shannon and Maloney-Hall, Bridget and Madi, Nawaf and Porath-Waller, Amy J. and Perlman, Christopher M.",
volume="ePub",
number="ePub",
pages="ePub-ePub",
abstract="OBJECTIVES: To examine the trends in cannabis use within 30 days of first admission to inpatient psychiatry in Ontario, Canada, between 2007 and 2017, and the  characteristics of persons reporting cannabis use. <br><br>METHODS: A retrospective  cross-sectional analysis was conducted for first-time admissions to nonforensic  inpatient psychiatric beds in Ontario, Canada, between January 1, 2007, and December  31, 2017, using data from the Ontario Mental Health Reporting System (N = 81,809). <br><br>RESULTS: Across all years, 20.1% of patients reported cannabis use within 30 days of  first admission. Use increased from 16.7% in 2007 to 25.9% in 2017, and the  proportion with cannabis use disorders increased from 3.8% to 6.0%. In 2017, 47.9%  of patients aged 18 to 24 and 39.2% aged 25 to 34 used cannabis, representing  absolute increases of 8.3% and 10.7%, respectively. Increases in cannabis use were  found across almost all diagnostic groups, with the largest increases among patients  with personality disorders (15% increase), schizophrenia or other psychotic  disorders (14% increase), and substance use disorders (14% increase). A number of  demographic and clinical factors were significantly associated with cannabis use,  including interactions between schizophrenia and gender (area under the curve =  0.88). <br><br>CONCLUSIONS: As medical cannabis policies in Canada have evolved, cannabis  use reported prior to first admission to inpatient psychiatry has increased. The  findings of this study establish a baseline for evaluating the impact of changes in  cannabis-related policies in Ontario on cannabis use prior to admission to inpatient  psychiatry.<p /> <p>Language: en</p>",
language="en",
issn="0706-7437",
doi="10.1177/0706743720984679",
url="http://dx.doi.org/10.1177/0706743720984679"
}