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. 2021 Jun 24;226:108822. doi: 10.1016/j.drugalcdep.2021.108822

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Fig. 1 — Prevalence of Substance Use and Substance Availability Before and During the 2020 Pandemic, by Level of Social Distancing in Summer of 2020. ^aAssessed between February 11 and March 15, 2020; ^bAssessed between July 16 and August 10, 2020; ^cQuestion asked of a randomly-selected one-third of sample as baseline and all respondents at follow-up; dQuestion asked of a randomly-selected one-sixth of sample at baseline and of all respondents at follow up.