a Gender of patients filling naloxone Rx, by prescriber specialty group. b Age of patients filling naloxone Rx, by prescriber specialty group. For ease of interpretation, detailed age groups were collapsed as follows: < 18 (< 11, 12–17), 18–35 18–25,26–30,31–35, 36–45 (36–40, 41–45), 46–65 (46–50, 51–55, 56–60, 61–65), 66+ (66–70, 71–75, 76–80, > 80).