Table 4.

Subgroup analysis: Estimates of association between cannabis legalization and urine cannabis drug screen results (n = 199)

Urine drug screen resultsa	Pre-legalization statistic	Post-legalization statistic	Estimate of association with cannabis legalization	95% CI	p
Cannabis user	n = 139 (69.9%)	n = 135 (67.8%)	OR = 1.67	0.93, 2.99	0.087
Percentage of cannabis-metabolite-positive drug screens	Median = 75 IQR = 100	Median = 71.4 IQR = 100	OR = 1.00	0.99, 1.01	0.638

Subgroup analysis: Estimates of association between cannabis legalization and urine cannabis drug screen results

CI confidence interval, OR odds ratio, IQR interquartile range

^aUrine drug screens for cannabis-metabolites were available for a subgroup of participants who were recruited pre-legalization (n = 199). Pre-legalization drug screens were assessed for up to 12 months before study entry, and post-legalization drug screens were assessed for 6 to 12 months post-study entry, ensuring that these results were from the post-legalization period