Table 1 Socio-demographic characteristics of study participants stratified by Sex

Age years (Median, IQR)

33 (27–39) 

34 (28–40) 

30 (25–36)

Region

Nairobi

1714 (52%)

1088 (47%)

626 (65%)

Coast

1588 (48%)

1248 (53%)

340 (35%)

Marital status

Single

1368 (41%)

898 (38%)

470 (49%)

Married

857 (26%)

669 (29%)

188 (19%)

Partnered

221 (7%)

114 (5%)

107 (11%)

Divorced/ Separated/ Widowed

854 (26%)

654 (28%)

200 (21%)

Missing data

2

Employment

Formal

176 (5%)

133 (6%)

43 (4%)

Self–employ

391 (12%)

252 (11%)

139 (14%)

Informal

511 (15%)

465 (20%)

46 (5%)

Illegal

491 (15%)

167 (7%)

324 (34%)

No income or partner family support

256 (8%)

76 (3%)

180 (19%)

Others unspecified and missing data

1477 (45%)

Housing

Stable

2888 (87%)

2027 (87%)

861 (89%)

Unstable

410 (12%)

307 (13%)

103 (11%)

Missing data

4

Partner types

Sexual

590 (18%)

367 (16%)

223 (23%)

Injecting

2326 (70%)

1685 (72%)

641 (66%)

Both injecting and sexual

380 (12%)

279 (12%)

101 (10%)

Missing data

6

HIV status

Negative

2697 (82%)

2046 (88%)

651 (67%)

Positive

594 (18%)

280 (12%)

314 (33%)

Missing data

11

ART status

On ART

461 (14%)

221 (9%)

240 (25%)

Not on ART

133 (4%)

59 (3%)

74 (8%)

Not living with HIV

2708 (82%)

Injection drug use status

Non–active

126 (4%)

74 (3%)

52 (5%)

Active (injected ≥ 1time last month)

2622 (79%)

1909 (82%)

713 (74%)

Incomplete and missing data

554 (17%)

Methadone treatment status

Taking Methadone

676 (20%)

530 (23%)

146 (15%)

Not taking Methadone

2289 (69%)

1633 (70%)

656 (68%)

Never injected drugs

337 (10%)

Male participants’ sexual partners

Only women

2138 (65%)

2138 (91.6%)

–

Men (or both men and women)

190 (5.8%)

190 (8.1%)

–

NA

8 (0.2%)

8 (0.3%)

–

Female participants’ sexual partners

Only men

892 (27%)

–

892 (92.3%)

Women (or both men and women)

72 (2.2%)

–

72 (7.5%)

NA

2 (0.06%)

–

2 (0.2%)