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Table 3 Age at onset of substance use compared with age at which the subject first ran away among the adolescents of the 2004--2006 street outreach programme in Taiwan

From: Running away experience and psychoactive substance use among adolescents in Taiwan: multi-city street outreach survey

Substance N Younger Same Age Older p value for
   n (%) n (%) n (%) χ 2 testa
Alcohol 937 399 (42.6) 173 (18.5) 365 (38.9) 0.2187
Tobacco 813 372 (45.8) 156 (19.2) 285 (35.1) 0.0007
Betel nut 198 66 (33.3) 37 (18.7) 95 (48.0) 0.0223
Any illegal drug/inhalant 211 40 (19.0) 31 (15.7) 140 (66.3) <0.0001
   Ecstasy 139 25 (18.0) 21 (15.1) 93 (66.9) <0.0001
   Ketamine 75 13 (17.3) 9 (12.0) 53 (70.7) <0.0001
   Marijuana 33 5 (15.2) 7 (21.2) 21 (63.6) 0.0017
   Methamphetamine 25 5 (20.0) 2 (8.0) 18 (72.0) 0.0067
   Flunitrazepam 26 6 (23.1) 3 (11.5) 17 (65.4) 0.0218
   Glue 26 2 (7.7) 8 (30.8) 16 (61.5) 0.0010
  1. aThe proportions of those with a younger or older age at onset for substance use were tested against the expected proportions of 50% under the null hypothesis of no ordering between running away and substance use.