Table 2:

Changes in the rate of acute care for cannabis use and control conditions during pregnancy before and after the legalization of nonmedical cannabis in Ontario, Canada

Condition	Before legalization*		After legalization*		Incidence rate ratio (95% CI)
	No. of pregnancies	Mean quarterly rate per 100 000 pregnancies	No. of pregnancies	Mean quarterly rate per 100 000 pregnancies
Cannabis use	299	11.0	241	20.0	1.82 (1.44–2.31)
Noncannabis substance use	1231	41.4	575	42.8	1.03 (0.91–1.17)
Any mental health condition	4575	189.1	1880	162.8	0.86 (0.78–0.95)

Note: CI = confidence interval.

^*Total of 678 353 pregnancies before legalization and 302 045 pregnancies after legalization.