Table 5.

Cross-country Post-Hoc Comparisons.

	Odds Ratio	95% Lower CI	95% Upper CI
Used Cannabis in the last 12 months (yes)
AU vs EN	0.99	0.76	1.27
AU vs US	0.66	0.51	0.87
AU vs CA	0.48	0.38	0.61
EN vs US	0.67	0.56	0.81
EN vs CA	0.48	0.42	0.56
US vs CA	0.72	0.61	0.86
Daily cannabis use (yes)
AU vs EN	1.03	0.55	1.94
AU vs US	0.52	0.27	1.02
AU vs CA	0.58	0.32	1.05
EN vs US	0.51	0.33	0.79
EN vs CA	0.56	0.39	0.80
US vs CA	1.10	0.73	1.66
Dual-daily co-users of cannabis and cigarettes (yes)
CA vs EN	1.27	0.96	1.68
CA vs US	0.83	0.62	1.11
CA vs AU	1.50	0.95	2.36
EN vs US	0.65	0.47	0.91
EN vs AU	1.18	0.73	1.91
US vs AU	1.82	1.11	2.99
Nicotine dependence (HSI): moderate/high vs. low
AU vs EN	1.93	1.17	3.18
AU vs US	2.12	1.25	3.59
AU vs CA	2.02	1.25	3.25
EN vs US	1.10	0.79	1.53
EN vs CA	1.05	0.80	1.37
US vs CA	0.95	0.70	1.29
Perceive smoked cannabis to be less harmful than cigarette smoking among past 12-months cannabis users
AU vs EN	1.56	0.68	3.62
AU vs US	0.42	0.15	1.19
AU vs CA	0.74	0.32	1.71
EN vs US	0.27	0.13	0.54
EN vs CA	0.48	0.31	0.74
US vs CA	1.79	0.87	3.70
Smoked cannabis in the last 30 days (yes)
AU vs EN	0.60	0.17	2.10
AU vs US	1.16	0.35	3.82
AU vs CA	1.72	0.58	5.12
EN vs US	1.94	0.91	4.14
EN vs CA	2.88	1.50	5.56
US vs CA	1.49	0.89	2.49
Mixed tobacco with smoked cannabis in the last 30 days (yes)
AU vs EN	0.65	0.33	1.29
AU vs US	21.34	11.34	40.15
AU vs CA	9.81	5.53	17.42
EN vs US	32.89	19.30	56.07
EN vs CA	15.13	9.46	24.20
US vs CA	0.46	0.32	0.66

CI: Confidence interval; AU: Australia; CA: Canada; EN: England; US: United States; HSI: Heaviness of Smoking Inde