Table 2.

Factors associated with two or more poisonings during one year – multiple logistic regression analysis

	Patients total	Patients with two or more poisonings	Crude			Adjusted
	n	n (%)	Odds ratio	95% CI	p-value	Odds ratio	95% CI	p-value
Gender
Females	595	72 (12)	1			1
Males	1136	203 (18)	1.6	1.2–2.1	0.002	1.3	0.96–1.8	0.090
Agea			1.02	1.01 – 1.02	<  0.001	1.02	1.01–1.03	< 0.001
Main toxic agent
Ethanol	972	106 (11)	1			1
Opioids	364	121 (33)	4.1	3.0–5.5	<  0.001	3.7	2.7–5.1	< 0.001
Stimulants	105	22 (21)	2.2	1.3–3.6	0.003	2.1	1.2–3.6	0.008
GHB	85	11 (13)	1.2	0.63–2.4	0.57	1.4	0.70–2.8	0.34
Benzodiazepines	144	13 (9)	0.81	0.44–1.5	0.50	0.70	0.35–1.4	0.33
Other	61	2 (3)	0.28	0.07–1.2	0.077	0.27	0.06–1.1	0.075
Suicide attemptb	130	21 (16)	1.0	0.63–1.7	0.93	1.2	0.65–2.2	0.55
Severe mental illness	183	55 (30)	2.6	1.8–3.7	< 0.001	2.9	1.9–4.2	< 0.001
Homeless	83	27 (33)	2.7	1.7–4.4	< 0.001	1.3	0.78–2.3	0.29
Self-dischargec	266	89 (33)	3.5	2.6–4.7	<  0.001	3.0	2.2–4.1	< 0.001
Total	1731	275 (16)

Adjusted odds ratios for significant associations are shown in bold types

^aContinuous variable

^bSuicidal intention in at least one poisoning episode

^cSelf-discharge in at least one poisoning episode

CI confidence interval, GHB gamma-hydroxybutyrate