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Table 1 Demographic data of the drug users in this study

From: Application of the Chinese version of the addiction profile index (API) in drug users: an analysis of validity and measurement invariance across genders

 Number of participants (%)/Mean ± SD
Shanxi (n = 487)Sichuan (n = 625)Guizhou (n = 482)Guangdong (n = 508)Hunan (n = 150)Total (N = 2252)
Gender
 Male348 (26.6)448 (34.2)141 (10.8)247 (18.9)125 (9.5)1309 (100)
 Female139 (14.7)177 (18.8)341 (36.2)261 (27.7)25 (2.7)943 (100)
Age    33.52 ± 8.629
 18–2560 (13.5)148 (33.3)106 (23.9)111 (25.0)19 (4.3)444 (100)
 26–34200 (23.3)275 (32.1)135 (15.8)189 (22.1)58 (6.8)857 (100)
 35–44173 (26.2)138 (20.9)144 (21.8)160 (24.2)46 (7.0)661 (100)
  ≥ 4554 (18.6)64 (22.1)97 (33.4)48 (16.6)27 (9.3)290 (100)
Employment
 Unemployed195 (18.3)286 (26.9)288 (27.0)221 (20.8)75 (7.0)1065 (100)
 Employed292 (24.6)339 (28.6)194 (16.3)287 (24.2)75 (6.3)1187 (100)
Educational level
  ≤ Primary121 (26.7)123 (27.1)79 (17.4)116 (25.6)15 (3.3%)454 (100)
 Middle233 (19.7)328 (27.7)262 (22.1)289 (24.4)73 (6.2)1185 (100)
 High82 (18.2)135 (29.9)101 (22.4)84 (18.6)49 (10.9)451 (100)
  ≥ University31 (30.7)31 (30.7)21 (20.8)10 (9.9)8 (7.9)101 (100)
Categorya
 Opioidsb180 (17.4)209 (20.3)321 (31.1)266 (25.8)56 (5.4)1032 (100)
 Cannabis33 (14.0)102 (43.4)22 (9.4)60 (25.5)18 (7.7)235 (100)
 ATSc318 (19.6)538 (33.2)266 (16.5)371 (22.9)129 (8.0)1622 (100)
 Hallucinogend76 (15.4)204 (42.4)49 (10.2)111 (23.1)41 (8.5)481 (100)
 Pills-Medicinee84 (52.2)38 (23.6)16 (9.9)17 (10.6)6 (3.7)161 (100)
 Othersf151 (51.0)55 (18.6)19 (6.4)61 (20.6)10 (3.4)296 (100)
  1. a: Usage in previous period
  2. b: Opioids = Heroin + Opiates
  3. c: ATS = Amphetamine-type stimulants = Ice + Magu +Ecstasy
  4. d: Hallucinogen = Ketamine
  5. e: Pills-Medicine = Dolantin +Morphine + Rohypnol +Rivotril +Akineton + Tantum
  6. f: Others = GHB + LSD + Crack + Cocaine
  7. Abbreviations: SD standard deviation