Table. Change in Percentage of Cannabis Use During Pregnancy After the Start of the Pandemic^a.

Interrupted time-series model variables	Rate ratio (95% CI)
	Unadjusted	Adjustedb
Pre–COVID-19 expected trendc	1.001 (0.994-1.008)	1.001 (0.993-1.008)
COVID-19 shift	1.268 (1.145-1.405)d	1.251 (1.120-1.397)d
COVID-19 change in trend	0.989 (0.973-1.006)	0.992 (0.975-1.010)

^aSee the Methods section for the prepandemic period definition.

^bAdjusted for age (<25, 25 to <35, and ≥35 years) and self-reported race and ethnicity from the electronic health record (see the Methods section definition for race and ethnicity).

^cSee Laboratory Methods in the Supplement for determination of prenatal cannabis use.

^dSignificant at P < .05.