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Table 3 Factors associated with repeated poisoning—Cox regression analysis

From: Follow-up of young patients after acute poisoning by substances of abuse: a comparative cohort study at an emergency outpatient clinic

    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
  1. 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
  2. aReference group