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. Author manuscript; available in PMC: 2010 Dec 10.
Published in final edited form as: Ann Intern Med. 2010 Jan 19;152(2):85–92. doi: 10.1059/0003-4819-152-2-201001190-00006

Figure 1. Cohort entry, overdose events, and 90 day opioid exposure windows for overdose events and comparators.

Figure 1

Average opioid dose was compared for each patient who overdosed for the preceding 90 days to all patients remaining eligible as of the same number of elapsed days since the start of the observation period. Patients were followed until their first opioid overdose, or until censored due to health plan disenrollment, death or reaching the end of the observation period.