High Risk or Risky Highs: Understanding the Links Between Alcohol and Cannabis Use on the Transition From Suicidal Ideation to Attempts in Australian Men

Figures & data

TABLE 1. Count data of suicide outcomes across time.

Characteristic	Time
	1	2
	(n = 7,464)	(n = 7,464)
Suicide ideation	1,333 (18%)	1,840 (25%)
Suicide attempt	324 (4.3%)	369 (4.9%)

TABLE 2. Logistic regression to determine association between alcohol consumption and cannabis use overall across time.

	Suicide attempt @ W1			Suicide attempt @ W2
Predictors	Odds ratios	95% CI	p	Odds ratios	95% CI	p
Intercept	0.03	0.02–0.04	<0.001	0.03	0.03–0.04	<0.001
Alcohol use	1.04	1.02–1.06	<0.001	1.04	1.02–1.05	<0.001
Cannabis use	1.18	1.11–1.25	<0.001	1.22	1.16–1.29	<0.001
Observations	7,464			7,464
R^2 Tjur	0.011			0.015

FIGURE 1. Sankey plot to show individuals’ suicide outcome over time. W1 and W2 indicate wave 1 and wave 2 respectively showing change over time. Groups based on suicide outcome in past 12 months: neither = no suicidal ideation or suicide attempts; ideation = suicidal ideation; both = suicidal ideation and attempts.

TABLE 3. Descriptive statistics of alcohol consumption and cannabis use for each transition group.

Time	n	Alcohol use (SD)	Cannabis use mean (SD)
SI-Neither
1	201	8.17 (7.07)	0.93 (1.90)
2	201	7.11 (6.45)	0.79 (1.78)
SI-SA
1	80	7.78 (6.59)	0.89 (1.71)
2	80	8.03 (7.42)	1.43 (2.20)
SI-SI
1	758	7.46 (6.24)	0.84 (1.82)
2	758	6.97 (6.15)	0.86 (1.85)

TABLE 4. Binomial regression to determine association between alcohol consumption and cannabis use and suicide outcome.

	SI-Neither vs. SI-SI			SI-SI vs. SI-SA			SI-Neither vs. SI-SA
Predictors	Odds ratios	95% CI	p	Odds ratios	95% CI	p	Odds ratios	95% CI	p
(Intercept)	3.84	3.04–4.88	<.001	0.08	0.06–0.12	<.001	0.32	0.21–0.48	<.001
Alcohol use	0.99	0.97–1.02	.683	1.02	0.98–1.05	.396	1.01	0.97–1.05	.762
Cannabis use	1.02	0.94–1.12	.594	1.13	1.01–1.25	.026	1.16	1.02–1.33	.025
Observations	959			838			281
R^2 Tjur	0.000			0.009			0.022