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Table 2 Demographic characteristics and ketamine-using history of the RDS-sample in Taipei Metropolitan Area (N = 1115), by illicit drug use experience

From: Mis-anaesthetized society: expectancies and recreational use of ketamine in Taiwan

Variables Illicit drug-naïve (Group 1; N = 840) Exclusive ketamine use (Group 2; N = 30) Polydrug ketamine use (Group 3; N = 132) The other illicit drug use (Group 4; N = 113) Group comparisons
N %wt 95% CI N %wt 95% CI N %wt 95% CI N %wt 95% CI Pc Post-hocd
Male 504 55.4 (49.3–62.0) 10 63.2 (37.6–86.4) 44 59.7 (45.9–73.8) 36 64.5 (50.2–79.6) .160
Education < college 513 65.9 (60.0–71.5) 23 83.0 (63.2–96.8) 94 71.3 (57.6–82.5) 71 69.6 (55.6–81.6) .141
Unemployment 39 5.8 (3.4–8.4) 3 10.8 (0.0–29.0) 16 14.5 (3.7–28.5) 21 22.6 (7.8–39.6) < .001 3, 4 > 1
Early-onseta tobacco use 265 26.7 (22.0–30.9) 17 61.8 (38.2–85.9) 72 47.5 (35.7–62.1) 52 52.5 (37.1–63.8) <.001 2, 3, 4 > 1
Early-onseta alcohol useb 290 29.8 (25.4–34.9) 15 47.9 (23.7–74.4) 64 45.8 (33.5–58.8) 58 57.6 (43.4–70.0) <.001 3, 4 > 1
  N Mean SD N Mean SD N Mean SD N Mean SD Pc Post-hocd
Age in years 840 28.1 8.2 30 21.8 3.6 132 26.0 5.5 113 30.1 7.6 < .001 1 > 2, 3; 4 > 3 > 2
Age at first tobacco use 772 17.1 3.7 29 14.6 2.1 129 15.4 3.3 110 15.6 3.0 < .001 1 > 2, 3, 4
Age at first alcohol use 766 16.0 4.1 29 14.9 3.1 130 14.6 3.5 109 15.2 3.9 < .001 1 > 3
  1. aAn onset use age of < 16 years, which is the end of compulsory education up to middle school, is defined as early–onset use
  2. bThree individuals were missing on the information on onset age of alcohol use
  3. cχ2 test or Fisher’s exact test for categorical variables; ANOVA for quantitative variables
  4. dTukey’s HSD test in ANOVA; a Tukey-type multiple comparison for proportions in a 2*4 cross-tabulation for categorical variables (Elliott and Reisch 2006)