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Table 1 Demographic characteristics and ketamine-using history of the RDS-sample in Taipei Metropolitan Area (N = 1115)

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

Variable Nc %wtd 95% CI
Gender
 Male 689 57.2 (51.5–62.9)
 Female 426 42.8 (37.1–48.5)
Education
 < college 701 67.3 (62.7–72.8)
 College and above 414 32.1 (26.8–37.3)
Employment
 Full-time job 631 54.8 (48.6–60.5)
 Work-study/in school 345 29.9 (24.5–35.6)
 Part-time job/military 60 6.5 (4.5–8.6)
 Unemployed 79 8.7 (5.9–12.6)
Early-onseta tobacco use 406 32.0 (27.7–36.4)
Early-onseta alcohol useb 427 34.1 (30.1–38.5)
Age in years
 Mean (SD) 1115 27.9 7.9
 Median (25–75%) 1115 26.0 22.0–32.0
Age at first tobacco use
 Mean (SD) 1040 16.7 3.6
 Median (25–75%) 1040 16.0 14.0–18.0
Age at first alcohol use
 Mean (SD) 1037 15.7 4.1
 Median (25–75%) 1037 16.0 14.0–18.0
  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. cSeeds are included in the numbers.
  4. dWeighted percentages and their 95% confidence intervals are RDS-adjusted population proportions estimated using the software RDSAT version 7.1.