Table 4 Associations between age at first substance use and having cannabis use disorder^a among subjects who reported using cannabis in the last year – binary logistic regression (n = 764)

 Alcohol (n = 750)

15.15 ± 1.7

15.50 ± 1.8

0.89 (0.82, 0.98)

.012

0.89 (0.81, 0.98)

.018

0.95 (0.86, 1.06)

.354

 Tobacco (n = 663)

14.75 ± 2.7

15.45 ± 3.2

0.92 (0.86, 0.97)

.004

0.89 (0.83, 0.95)

<.001

0.94 (0.87, 1.01)

.095

 Cannabis (n = 758)

16.84 ± 3.4

18.10 ± 3.9

0.90 (0.85, 0.94)

<.001

0.91 (0.87, 0.96)

.001

0.96 (0.90, 1.02)

.14

 Alcohol (n = 579)

15.22 ± 1.7

15.44 ± 1.7

0.92 (0.83, 1.02)

.112

0.92 (0.83, 1.03)

.142

0.99 (0.87, 1.12)

.867

 Tobacco (n = 502)

14.65 ± 2.5

15.64 ± 2.4

0.84 (0.78, 0.91)

<.001

0.82 (0.76, 0.89)

<.001

0.86 (0.78, 0.94)

.001

 Cannabis (n = 584)

16.52 ± 2.4

17.52 ± 2.4

0.84 (0.78, 0.90)

<.001

0.84 (0.78, 0.91)

<.001

0.89 (0.82, 0.98)

.012