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Table 2 Prescription opioid (PO) and heroin injection history and behavior among young adult PWID (n = 353)

From: Prescription opioid injection among young people who inject drugs in New York City: a mixed-methods description and associations with hepatitis C virus infection and overdose

VariableMean (SD), mediann (%)
Opioid use trajectory1  
 Age at first nonmedical PO use16.5 (3.0), 16 
 Age at first heroin use19.1 (3.5), 19 
 Age at first heroin injection20.4 (3.7), 20 
 Age at first PO injection20.6 (3.6), 20 
Drug used at first injection  
 POs 26 (7)
 Heroin 289 (82)
 Crack 14 (4)
 Other 24 (7)
Number of months injected POs regularly2 (lifetime)10.2 (20.4), 0 
 0 months 261 (74)
 1–12 months 48 (14)
 13–36 months 29 (8)
  > 36 months 15 (4)
Number of months injected heroin regularly2 (lifetime)34.5 (34.9), 24 
 0 months 39 (11)
 1–12 months 104 (29)
 13–36 months 91 (26)
 > 36 months 119 (34)
Number of days injected POs in the past 30 days5.0 (16.0), 0 
 0 days 304 (86)
 1–7 days 32 (9)
 8–15 days 14 (4)
 > 15 days 3 (1)
Number of days injected heroin in the past 30 days18.6 (11.6), 20 
 0 days 56 (16)
 1–7 days 54 (15)
 8–15 days 44 (12)
 > 15 days 199 (56)
Type of opioid injected in the past 30 days  
 Heroin only 251 (71)
 POs only 3 (1)
 Heroin and POs 46 (13)
 Neither heroin nor POs 53 (15)
  1. This table is based on the 353 participants who reported ever injecting drugs
  2. 1Participants who did not inject POs/heroin were not included in the means and standard deviations
  3. 2“Regular” injection is defined as injecting 3 or more times per week for at least 1 month