Table 3.

Unadjusted odds ratios (OR) and 95% Confidence Intervals (CI) of substance use (dependent variable) in relation to suicidal ideation status.

	Suicidal Ideation-Wave 1	Suicidal Ideation-Wave 2	Suicidal Ideation–Wave 3	Suicidal Ideation-Wave 4

Regular Smoking-Wave 1	2.89 (2.25–3.70) ^***
Regular Smoking-Wave 2	2.68 (2.14–3.36) ^***	2.82 (2.15–3.71) ^***
Regular Smoking-Wave 3	1.58 (1.24–2.03) ^***	1.59 (1.26–2.01) ^***	1.69 (1.26–2.28) ^**
Regular Smoking-Wave 4	1.86 (1.50–2.30) ^***	1.68 (1.30–2.16) ^***	1.53 (1.16–2.02) ^**	1.74 (1.25–2.42) ^**

Alcohol Use-Wave 1
≤Monthly Use vs. No Use	2.36 (1.80–3.08) ^***
Weekly Use vs. No Use	3.02 (2.05–4.43) ^***

Alcohol Use-Wave 2
≤Monthly Use vs. No Use	1.74 (1.36–2.23) ^***	1.99 (1.53–2.58) ^***
Weekly Use vs. No Use	1.93 (1.34–2.79) ^**	2.40 (1.60–3.59) ^***

Alcohol Use-Wave 3
≤Monthly Use vs. No Use	ns.	ns.	2.35 (1.41–3.94) ^**
Weekly Use vs. No Use	ns.	ns.	2.57 (1.58–4.18) ^***

Alcohol Use-Wave 4
≤Monthly Use vs. No Use	ns.	ns.	ns.	ns.
Weekly Use vs. No Use	ns.	ns.	1.67 (1.11–2.51) ^*	ns.

Marijuana Use-Wave 1	3.09 (2.44–3.91) ^***
Marijuana Use-Wave 2	2.61 (2.04–3.34) ^***	2.59 (2.01–3.32) ^***
Marijuana Use-Wave 3	1.57 (1.23–2.00) ^***	1.61 (1.22–2.13) ^**	2.89 (2.05–4.07) ^***
Marijuana Use-Wave 4	1.63 (1.24–2.15) ^**	1.65 (1.24–2.19) ^***	2.44 (1.70–3.49) ^***	1.98 (1.34–2.93) ^**

Other Illegal Drugs-Wave 1	4.57 (3.52–5.94) ^***
Other Illegal Drugs-Wave 2	3.55 (2.67–4.72) ^***	4.39 (3.19–6.03) ^***
Other Illegal Drugs-Wave 3	1.82 (1.44–2.31) ^***	1.92 (1.48–2.50) ^***	3.48 (2.53–4.79) ^***
Other Illegal Drugs-Wave 4	2.19 (1.71–2.80) ^***	2.29 (1.77–2.97) ^***	2.96 (2.15–4.09) ^***	2.16 (1.53–3.05) ^***

Note.

p≤.05,

^**

p<.01,

^***

p<.001. ns., insignificant.