Table 3.

Factors associated with repeated poisoning—Cox regression analysis

			Crude			Adjusted
	n	Events	Hazard ratio	95 % CI	p	Hazard ratio	95 % CI	p
Age
16–22 yearsa	788	58
23–27 years	535	65	1.7	1.2–2.4	0.004	1.1	0.78–1.6	0.525
Sex
Femalesa	604	45
Males	719	78	1.5	1.0–2.2	0.033	1.1	0.77–1.6	0.553
Main toxic agent
Ethanola	823	30
Opioids	215	59	9.3	6.0–14.4	<0.001	8.9	5.6–14.1	<0.001
Benzodiazepines	108	16	4.7	2.5–8.6	<0.001	4.8	2.5–8.9	<0.001
Central stimulants	62	6	2.8	1.2–6.7	0.022	2.6	1.1–6.4	0.032
GHB	70	9	3.6	1.7–7.7	0.001	3.7	1.7–8.3	0.001
Other	45	3	1.9	0.58–6.2	0.288	1.8	0.56–6.1	0.316
Outcome
Not hospitaliseda	1150	100
Hospitalised	173	23	1.6	1.0–2.5	0.050	0.91	0.56–1.5	0.706

Factors associated with repetition of poisoning in 1323 patients aged 16–27 years presenting with acute poisoning by substances of abuse in 2003, 2008 and 2012. There were 123 events (repetitions). One patient was censored due to death, two were censored due to emigration

^aReference group