Table 1 Participants’ socio-demographic characteristics (n = 3439)

N

384

248

248

399

249

250

250

246

367

398

400

3439

 Median (IQR)

31 (26–37)

28 (24–35)

26 (23–30)

30 (25–35)

27 (24–31)

31 (26–39)

29 (24–34)

29 (24–37)

31 (28–35)

27 (25–31)

30 (26–34)

29 (25–35)

 < 25 years

80 (21%)

78 (31%)

104 (42%)

90 (23%)

78 (31%)

49 (20%)

68 (27%)

65 (26%)

28 (8%)

96 (24%)

71 (18%)

807 (23%)

 ≥ 25 year

304 (79%)

170 (69%)

144 (58%)

309 (77%)

171 (69%)

201 (80%)

182 (73%)

181 (74%)

339 (92%)

302 (76%)

329 (82%)

2632 (77%)

 Female

337 (88%)

247 (> 99%)

248 (100%)

397 (> 99%)

246 (99%)

0

0

0

69 (19%)

42 (11%)

55 (14%)

1641 (48%)

 Male

47 (12%)

1 (< 1%)

0

2 (< 1%)

3 (1%)

250 (100%)

250 (100%)

246 (100%)

298 (81%)

356 (89%)

345 (86%)

1798 (52%)

 Black

106 (28%)

182 (73%)

247 (99%)

369 (92%)

249 (100%)

102 (41%)

197 (79%)

118 (48%)

15 (4%)

218 (55%)

275 (69%)

2078 (60%)

 Coloured

247 (64%)

49 (20%)

0

12 (3%)

0

47 (19%)

9 (4%)

9 (4%)

274 (75%)

45 (11%)

13 (3%)

705 (21%)

 White

18 (5%)

17 (7%)

0

5 (1%)

0

92 (37%)

37 (15%)

109 (44%)

71 (19%)

96 (24%)

109 (27%)

554 (16%)

 Indian/ Asian

1 (< 1%)

9

0

10 (3%)

0

4 (2%)

2 (1%)

4 (2%)

1 (< 1%)

39 (10%)

1 (< 1%)

62 (2%)

 Other

12 (3%)

0

1 (< 1%)

3 (1%)

0

5 (2%)

5 (2%)

6 (2%)

6 (2%)

0

2 (1%)

40 (1%)

Homeless

66 (17%)

1 (< 1%)

0

0

0

14 (6%)

1 (< 1%)

3 (1%)

201 (55%)

278 (70%)

262 (66%)

826 (24%)

General population^b

3,740,026

1,152,115

451,710

3,442,361

618,536

3,740,026

4,434,827

2,921,488

3,740,026

3,442,361

2,921,488