@article{ref1,
title="Quarterly trends in past-month cannabis use in the United States, 2015-2019",
journal="Drug and alcohol dependence",
year="2021",
author="Han, Benjamin H. and Le, Austin and Palamar, Joseph J.",
volume="219",
number="",
pages="e108494-e108494",
abstract="BACKGROUND: Prevalence of cannabis use has been increasing among select subgroups in the US; however, trend analyses typically examine prevalence of use across years. We  sought to determine whether there is seasonal variation in use. <br><br>METHODS: We  conducted a secondary analysis of the National Survey on Drug Use and Health, a  repeated cross-sectional survey of nationally representative probability samples of  noninstitutionalized populations age ≥12 in the US. Quarterly trends in any  past-month cannabis use were estimated using data from 2015-2019 (N = 282,768). <br><br>RESULTS: Prevalence of past-month cannabis use increased significantly from 2015 to  2019 from 8.3%-11.5%, a 38.2 % increase (P < 0.001). Prevalence increased across  calendar quarters on average from 8.9 % in January-March to 10.1 % in  October-December, a 13.0 % increase (P < 0.001). Controlling for survey year and  participant demographics, each subsequent quarter was associated with a 6% increase  in odds for use (aOR=1.06, 95 % CI: 1.04-1.07). There were significant increases by  quarter among all subgroups of sex, race/ethnicity, education, and among most adult  age groups (Ps<0.05), with a 52.7 % increase among those age ≥65. Prevalence also  significantly increased among those without a medical cannabis prescription and  those not proxy-diagnosed with cannabis use disorder (Ps<0.01), suggesting  recreational use may be driving increases more than medical or more chronic use. Those reporting past-year LSD or blunt use in particular were more likely to report  higher prevalence of use later in the year (a 4.9 % and 3.3 % absolute increase,  respectively; Ps<0.05). <br><br>CONCLUSION: The prevalence of cannabis use increases  throughout the year, independently of annual increases.<p /> <p>Language: en</p>",
language="en",
issn="0376-8716",
doi="10.1016/j.drugalcdep.2020.108494",
url="http://dx.doi.org/10.1016/j.drugalcdep.2020.108494"
}