Table 1.
Demographic characteristics and ketamine-using history of the RDS-sample in Taipei Metropolitan Area (N = 1115)
| 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 |
aAn onset use age of < 16 years, which is the end of compulsory education up to middle school, is defined as early–onset use.
bThree individuals were missing on the information on onset age of alcohol use.
cSeeds are included in the numbers.
dWeighted percentages and their 95% confidence intervals are RDS-adjusted population proportions estimated using the software RDSAT version 7.1.