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. 2021 Sep 27;326(17):1745–1747. doi: 10.1001/jama.2021.16328

Figure. Monthly Trends in Cannabis Use During Pregnancy Before and During the COVID-19 Pandemic (N = 100 005).

Figure.

Prenatal cannabis use was based on a positive toxicology screening result conducted as part of standard prenatal care (≈8 weeks’ gestation) and includes 1 screening per pregnancy. All positive toxicology test results were confirmed by a laboratory test (see Laboratory Methods in the Supplement). The median monthly sample size in the months before COVID-19 was 4085 (range, 3655-5040), with a mean of 4189. The median monthly sample size in the months during COVID-19 was 4124 (range, 3932-4356), with a mean of 4130. Error bars indicate 95% CIs of the standardized rates.