Table 1.

Change in the Predicted Diagnostic Prevalence of Cannabis Use Disorder in VHA patients, 2005–2019, by Age Category

	Predicted prevalence of cannabis use disorder, 2005–2014				Predicted prevalence of cannabis use disorder, 2016–2019
	2005 % (95% CI)	2014 % (95% CI)	2005–2014 Change (95% CI)	Difference in age group changes, 20052014 (95% CI)	2016 % (95% CI)	2019 % (95% CI)	2016–2019 Change (95% CI)	Difference in age group changes, 2016–2019 (95% CI)
<35	1.70 (1.63, 1.76)	4.55 (4.49, 4.61)	2.85 (2.77, 2.94)	Reference group	4.35 (4.29, 4.41)	4.84 (4.78, 4.90)	0.49 (0.40, 0.57)	Reference group
35–64	1.59 (1.57, 1.61)	2.94 (2.92, 2.96)	1.35 (1.32, 1.38)	−1.50 (−1.59, −1.41)	2.45 (2.43, 2.47)	2.86 (2.84, 2.89)	0.41 (0.38, 0.44)	−0.07 (−0.16, 0.02)
≥ 65	0.03 (0.03, 0.03)	0.54 (0.54, 0.55)	0.52 (0.51, 0.52)	−2.34 (−2.42, −2.25)	0.51 (0.50, 0.52)	0.74 (0.73, 0.75)	0.24 (0.22, 0.25)	−0.25 (−0.34, −0.16)

CI = Confidence Interval Adjusted for sex and race/ethnicity

Patients ages 35–64 and ≥65 increased significantly less than patients <35 (the reference group), as shown by negative difference in differences and confidence intervals that did not include 0.0.