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Table 3 Three key study outcomes using various sample cuts and RDS-weights

From: Does size really matter? A sensitivity analysis of number of seeds in a respondent-driven sampling study of gay, bisexual and other men who have sex with men in Vancouver, Canada

   n Crude % RDS I % (95% CI) RDS II % (95% CI) RDS SS % (95% CI)
HIV-positive serostatus (vs. HIV-negative) Overall 199 27.7 22.5 (19.4–25.6) 26.7 (20.7–32.7) 26.7 (20.7–32.7)
>0 Wave 189 28.3 22.9 (19.7–26.2) 27.7 (21.5–33.9) 27.7 (21.4–34.1)
>1 Wave 178 30.0 24.2 (20.6–27.7) 29.3 (22.6–36.0) 29.4 (22.6–36.1)
>2 Wave 161 30.0 23.8 (20.1–27.5) 29.1 (22.1–36.1) 29.1 (22.1–36.2)
Any high risk sex in past 6 months (vs. none) Overall 262 37.3 34.9 (31.1–38.8) 33.6 (27.6–39.6) 33.7 (27.7–39.7)
>0 Wave 251 38.4 35.5 (31.5–39.5) 35.2 (28.9–41.5) 35.3 (29.0–41.6)
>1 Wave 221 38.0 36.0 (31.7–40.3) 35.8 (29.3–42.4) 35.8 (29.2–42.4)
>2 Wave 203 38.7 37.0 (32.4–41.5) 36.4 (29.5–43.3) 36.5 (29.6–43.3)
Injected any drugs in past 6 months (vs. none) Overall 61 7.1 8.8 (5.5–12.1) 7.3 (3.9–10.7) 7.3 (3.9–10.7)
>0 Wave 51 7.6 9.1 (5.8–12.4) 8.1 (4.4–11.8) 8.1 (4.3–11.9)
>1 Wave 48 8.1 8.7 (5.7–11.7) 8.0 (4.7–11.3) 8.0 (4.7–11.3)
>2 Wave 43 8.0 8.7 (5.5–11.9) 8.3 (4.8–11.8) 8.3 (4.8–11.9)