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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)