Fig. 1

Cohorts and comparisons. The cohorts were made from three separate studies of acute poisoning at the Oslo Accident and Emergency Outpatient Clinic (OAEOC) in 2003, 2008, and 2012. The intervention program for patients under the age of 23 years presenting with acute poisoning by substances of abuse was implemented at the OAEOC in 2010. Repetition rates and proportions of patients referred to follow-up were compared before and after the implementation. Comparisons were made for patients in the target age, and for patients just older than the targeted age group. Referral to follow-up was not registered in the 2003 study