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Table 2 Factors associated with two or more poisonings during one year – multiple logistic regression analysis

From: Mortality and repeated poisoning after self-discharge during treatment for acute poisoning by substances of abuse: a prospective observational cohort study

  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)       
  1. Adjusted odds ratios for significant associations are shown in bold types
  2. aContinuous variable
  3. bSuicidal intention in at least one poisoning episode
  4. cSelf-discharge in at least one poisoning episode
  5. CI confidence interval, GHB gamma-hydroxybutyrate