Table 3.

Self-reported mental health problems in the past 30 days in relation to high frequency of drug use, early onset of drug use and poly drug use (controlling for age and gender)

	Frequency of drug use (N = 1776)			Age at onset of drug use (N = 1757)			Poly drug use (N = 1813)
	OR	P-value	95% CI	OR	P-value	95% CI	OR	P-value	95% CI
Constant	0.008	0.001		1.214	0.751		0.002	0.001
Age	1.264	0.001***	1.206–1.324	0.857	0.001***	0.802–0.915	1.296	0.001***	1.235–1.359
Gender	0.879	0.297	0.690–1.120	0.993	0.967	0.722–1.366	0.857	0.254	0.657–1.118
Depression	1.312	0.050	1.000–1.722	1.047	0.808	0.723–1.516	1.250	0.138	0.931–1.667
Anxiety	1.719	0.001***	1.318–2.241	1.412	0.068	0.975–2.045	1.358	0.048*	1.002–1.839
Concentration difficulties	1.408	0.003**	1.124–1.765	1.555	0.008**	1.122–2.155	1.434	0.007**	1.106–1.860
Aggressive behaviour	1.381	0.020*	1.052–1.812	1.576	0.007**	1.130–2.199	1.147	0.359	0.856–1.539
Suicidal thoughts	1.160	0.463	0.781–1.721	0.650	0.115	0.381–1.111	0.962	0.847	0.650–1.424
Hallucinations	0.849	0.501	0.526–1.368	1.601	0.099	0.915–2.803	1.652	0.041*	1.021–2.674
Eating disorders	1.549	0.054	0.993–2.419	1.304	0.318	0.774–2.197	1.146	0.545	0.737–1.783
Self-harming behaviour	0.880	0.599	0.546–1.418	0.601	0.849	0.460–1.567	1.102	0.692	0.682–1.778
Traumatic life event	0.986	0.910	0.775–1.255	1.335	0.075	0.971–1.836	1.302	0.043*	1.008–1.683
Cox & Snell	0.151			0.037			0.135
Nagelkerke	0.202			0.068			0.199

* = < 0.05 ** = < 0.01 *** = < 0.001