Table 1.

Participant Characteristics (n = 410)

	Crude (sample statistics)		RDS population estimate
	n	%	% (BCI)a	Homophily
Age, median (IQR)	28 (24–33)
18–24	122/410	29.8	37.7 (3.0–45.5)	0.14
25–34	205/410	50.0	43.9 (37.0–50.7)	0.15
35+	83/410	20.2	18.4 (12.7–24.1)	0.15
Education
Grade 1–7	50/410	12.2	12.2 (8.0–16.4)	0.04
Grade 8–11	300/410	73.2	72.4 (66.6–78.1)	0.08
Grade 12 and higher	60/410	14.6	15.4 (10.7–20.2)	0.05
Dependents
None	150/410	36.6	35.8 (28.9–42.7)	0.12
One or more	260/410	63.4	64.2 (57.3–71.1)	0.07
Income monthly, median, SD (IQR)	2,100, 3,297 (1,680–3,780)
Under ZAR2100	151/410	36.8	37.8 (31.1–44.4)	0.13
Over ZAR2100	259/410	63.2	62.2 (55.6–68.9)	0.15
HIV statusb,c
Unknown HIV+	43/401	10.7 (8.0–14.2)
Known HIV+	214/401	53.4 (48.4–58.2)
HIV−	144/401	35.9 (31.3–40.7)
PHQ-9 depression categories,d median, SD (range)	4, 6.29 (0–27)
Minimal (0–4)	218/410	53.2	55.9 (49.0–62.8)	0.11
Mild (5–9)	69/410	16.8	15.6 (11.0–20.1)	0.08
Moderate (10–14)	74/410	18.0	16.5 (11.3–21.7)	0.06
Moderately Severe (15–19)	38/410	9.3	8.8 (5.3–12.4)	0.05
Severe (20–27)	11/410	2.7	3.3 (0.1–6.6)	-0.03
Depressive symptomse
Minimal to mild (0–9)	287/410	70.0	71.2 (64.7–77.5)	0.04
Moderate to severe (10–27)	123/410	30.0	28.8 (22.4–35.2)	0.06

^a Bootstrapped confidence interval = 1,000 reps.

^b RDS extrapolation to population was not possible, as there were too many missing values.

^c HIV status derived from HIV test result and self-report of HIV status before this HIV test.

^d Missing value imputed for participants using mean.

^e Classification of depressive symptoms used for analysis (PHQ-9 cut-off >9).

IQR, interquartile range; PHQ-9, Patient Health Questionnaire-9; RDS, respondent-driven sampling; SD, standard deviation.