Table 3. Respondent-driven sampling recruitment metrics and HIV/HCV characteristics across PWID sites.
| Metric/characteristic | Northeast cities | North or central cities | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AIZ | CCP | DIM | GTK | IMP | LGL | MOR | DEL | MUM | AMR | CDH | LUD | BBE | BIL | KAN | |
| Total number recruited | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 | 457 | 999 | 999 | 999 | 996 | 1,000 | 1,000 | 1,000 | 1,000 |
| Number of seeds | 2 | 2 | 2 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Recruitment time (days) | 135 | 52 | 125 | 94 | 89 | 139 | 80 | 112 | 145 | 139 | 200 | 137 | 65 | 180 | 190 |
| Number of waves (by seed) | 21 (21, 18) |
17 (16, 17) |
14 (14, 14) |
13 (12, 13, 10) |
26 (26, 18) |
22 (22, 12) |
21 (17, 21) |
24 (24, 9) |
14 (14, 13) |
31 (31, 22) |
50 (50, 1) |
38 (38, 16) |
12 (12, 11) |
38 (38, 1) |
26 (25, 26) |
| Number of recruits by seed | 749, 251 | 392, 608 | 707, 293 | 375, 460, 165 | 927, 73 | 714, 271^ | 136, 321 | 952, 47 | 415, 584 | 872, 127 | 994, 2 | 931, 69 | 592, 408 | 998, 2 | 732, 268 |
| Coupon response rate (%) | 50 | 67 | 50 | 50 | 56 | 50 | 50 | 50 | 50 | 50 | 51 | 50 | 50 | 50 | 58 |
| Median network size* | 20 | 20 | 7 | 7 | 15 | 20 | 20 | 12 | 10 | 20 | 10 | 15 | 4 | 10 | 10 |
| Prevalence of unaware HIV-infected persons (%) | 9.8 | 16.8 | 4.3 | 0.8 | 18.1 | 3.1 | 17.7 | 13.5 | 4.7 | 13.8 | 10.0 | 16.7 | 1.7 | 12.5 | 34.3 |
| Rate of detection of unaware HIV-infected persons per day | 0.73 | 3.23 | 0.34 | 0.09 | 2.03 | 0.22 | 1.03 | 1.21 | 0.32 | 0.99 | 0.50 | 1.22 | 0.26 | 0.69 | 1.81 |
| Cost per unaware HIV-infected person identified (USD) | 230.0 | 83.4 | 550.1 | 2,071.7 | 145.3 | 694.9 | 153.5 | 139.0 | 516.6 | 130.8 | 297.9 | 85.4 | 1,317.4 | 126.3 | 50.8 |
| Prevalence of HIV viremia (%) | 23.3 | 14.1 | 9.3 | 2.8 | 18.2 | 3.9 | 28.2 | 15.6 | 8.4 | 20.1 | 10.7 | 19.5 | 3.1 | 14.3 | 33.8 |
| Rate of detection of HIV viremic persons per day | 1.73 | 2.71 | 0.74 | 0.31 | 2.06 | 0.28 | 1.63 | 1.39 | 0.58 | 1.45 | 0.54 | 1.42 | 0.48 | 0.79 | 1.78 |
| Cost per HIV viremic person identified (USD) | 185.6 | 233.8 | 397.7 | 811.9 | 262.4 | 729.4 | 200.9 | 192.7 | 365.6 | 166.2 | 355.0 | 152.6 | 857.8 | 183.3 | 122.5 |
| HCV prevalence (%) | 68,4 | 59.1 | 10.5 | 4.2 | 68.5 | 15.8 | 45.5 | 45.7 | 34.9 | 52.6 | 54.8 | 34.2 | 8.4 | 33.4 | 67.7 |
| Prevalence of unaware HCV-infected persons (%) | 54.3 | 52.8 | 10.2 | 3.2 | 58.0 | 14.9 | 41.6 | 44.8 | 33.3 | 48.1 | 53.9 | 33.6 | 8.1 | 33.3 | 67.3 |
| Rate of detection of unaware HCV-infected persons per day | 4.03 | 10.2 | 0.82 | 0.34 | 6.53 | 1.07 | 2.39 | 4.0 | 2.30 | 3.47 | 2.69 | 2.46 | 1.25 | 1.86 | 3.55 |
| Cost per unaware HCV-infected person identified (USD) | 49.9 | 35.2 | 277.2 | 662.6 | 53.2 | 175.6 | 77.0 | 52.2 | 86.8 | 47.0 | 64.0 | 56.0 | 333.6 | 61.1 | 32.8 |
| Prevalence of HCV viremia (%) | 58.0 | 47.1 | 8.8 | 3.5 | 55.4 | 12.9 | 37.4 | 37.0 | 27.6 | 42.1 | 43.4 | 27.3 | 7.2 | 28.9 | 56.7 |
| Rate of detection of HCV viremic persons per day | 4.3 | 9.06 | 0.70 | 0.37 | 6.22 | 0.93 | 2.14 | 3.3 | 1.90 | 3.03 | 2.16 | 1.99 | 1.11 | 1.61 | 2.98 |
| Cost per HCV viremic person identified (USD) | 164.8 | 164.8 | 439.5 | 722.9 | 179.3 | 324.6 | 207.7 | 186.4 | 230.8 | 178.5 | 205.8 | 194.1 | 491.9 | 185.9 | 158.4 |
*Number of PWID seen in prior 30 days.
^Error in coupon tracking resulted in missing recruiter–recruit link for 3 study participants who recruited 12 subsequent recruits.
AIZ, Aizawl; AMR, Amritsar; BBE, Bhubaneswar; BIL, Bilaspur; CCP, Churachandpur; CDH, Chandigarh; DEL, New Delhi; DIM, Dimapur; GTK, Gangtok; HCV, hepatitis C virus; IMP, Imphal; KAN, Kanpur; LGL, Lunglei; LUD, Ludhiana; MOR, Moreh; MUM, Mumbai; PWID, people who inject drugs; USD, US dollars.