Table 2.
Characteristics of survey participants adjusted for respondent-driven sampling, Ho Chi Minh City, Vietnam, 2017–18
| Characteristics | Survey 1 | Survey 2 |
|---|---|---|
| Total | 1241 | 1328 |
| Gender | ||
| Male | 1065 | 1135 |
| 87.9% (85.8–90.0) | 83.8% (81.2–86.4) | |
| Female | 175 | 193 |
| 12.1% (10.0–14.2) | 16.2% (13.6–18.8) | |
| Missing | 1 | 0 |
| Age | ||
| Mean, Median (IQR) | 36.4, 35 (31, 40) | 37.2, 36 (31, 42) |
| 18–24 | 94 | 76 |
| 8.0% (6.0–10.0%) | 6.6% (5.0–8.2%) | |
| 25–34 | 449 | 447 |
| 36.2% (32.8–39.6) | 32.9% (30.2–35.5) | |
| 35–49 | 583 | 678 |
| 47.1% (43.7–50.5) | 51.1% (48.1–54.1) | |
| >50 | 115 | 127 |
| 8.8% (6.6–10.8) | 9.5% (7.7–11.3) | |
| Days since last injected | ||
| Mean, Median (IQR) | 3.8, 1 (1–3) | 2.3, 1 (1, 2) |
| 0–1 | 779 | 981 |
| 56.9% (52.9–60.8) | 70.0% (66.5–73.4) | |
| 2–6 | 324 | 281 |
| 32.1% (28.7–35.6) | 24.1% (20.9–27.3) | |
| 7–29 | 92 | 46 |
| 7.4% (5.6–9.6) | 4.2% (2.6–5.7) | |
| >30 | 44 | 18 |
| 3.7% (2.0–5.3) | 1.7% (0.8–2.7) | |
| Missing | 2 | 2 |
| Received VCT in past 12 months | ||
| Yes | 564 | 466 |
| 49.1% (45.6–52.7) | 36.4% (33.1–39.8) | |
| No | 672 | 862 |
| 50.9% (47.3–54.4) | 63.6% (60.2–66.9) | |
| Missing | 5 | 0 |
| Number of VCTa visits in past 12 months (n = 564 for survey 1, n = 466 for survey 2) | ||
| Mean, Median (IQR) | 1.5, 1 (1, 2) | 1.4, 1 (1, 2) |
| 1 | 391 | 327 |
| 67.3% (62.1–72.5) | 73.2% (68.4–78.0) | |
| 2 | 101 | 104 |
| 20.6% (16.4–24.9) | 21.5 (17.0–25.9) | |
| >3 | 67 | 31 |
| 12.1% (8.7–15.5) | 5.4% (3.5–7.2) | |
| Missing | 5 | 4 |
| Number of known PWID living in HCMC and seen in the past 30 days | ||
| Mean, Median (IQR) | 4.2, 3 (2, 5) | 5.3, 4 (3, 5) |
| 1–4 | 548 | 469 |
| 70.0% (67.7–72.3) | 57.2% (54.1–60.0) | |
| 5– 9 | 386 | 491 |
| 21.1% (19.2–23.0) | 31.1% (28.7–33.6) | |
| 10–19 | 209 | 259 |
| 6.9% (6.2–7.6) | 9.4% (8.4–10.4) | |
| >20 | 98 | 109 |
| 2.0% (1.8–2.2) | 2.4% (2.1–2.7) | |
a
Voluntary counselling and testing for HIV.