Table 1 Characteristics of the study population by the categories of the HIV incidence rates and multivariable regression analysis
From: A decade of sustained geographic spread of HIV infections among women in Durban, South Africa
|  | Total N (%) | ≤5 per 100PY | 5–6.9 per 100PY | 7–8.9 per 100PY | 9+ per 100PY | Adjusted OR | p-value |
|---|---|---|---|---|---|---|---|
Age group | |||||||
  < 20 | 768 (10%) | 75 (7%) | 321 (11%) | 199 (10%) | 173 (10%) | 1.51 (1.06–2.15)* | 0.023 |
 20–24 | 2606 (34%) | 346 (33%) | 986 (35%) | 667 (34%) | 607 (35%) | 1.59 (1.19–2.14)* | 0.002 |
 25–29 | 1602 (21%) | 239 (23%) | 576 (21%) | 382 (20%) | 405 (23%) | 1.62 (1.2–2.18)* | 0.001 |
 30–34 | 1027 (14%) | 166 (16%) | 386 (14%) | 240 (12%) | 235 (13%) | 1.33 (0.98–1.82) | 0.069 |
 35+ | 1554 (21%) | 231 (22%) | 539 (19%) | 443 (23%) | 341 (19%) | 1 |  |
Education | |||||||
 None | 3322 (55%) | 577 (56%) | 1189 (52%) | 637 (50%) | 919 (60%) | 1 |  |
 Primary | 2485 (41%) | 436 (42%) | 992 (44%) | 535 (42%) | 522 (35%) | 0.8 (0.7–0.92)* | 0.002 |
 Secondary or higher | 281 (5%) | 19 (2%) | 89 (4%) | 92 (7%) | 81 (5%) | 1.46 (1.1–1.95)* | 0.009 |
Contraceptive use at baseline | |||||||
 None | 1079 (14%) | 108 (10%) | 416 (15%) | 356 (18%) | 199 (11%) | 1 |  |
 Male/Female condom | 1095 (15%) | 125 (12%) | 386 (14%) | 305 (16%) | 279 (16%) | 1.14 (0.65–2.01) | 0.639 |
 IUD or Sterile | 619 (8%) | 107 (10%) | 222 (8%) | 183 (10%) | 107 (6%) | 1.28 (0.71–2.29) | 0.406 |
 Oral contraceptives | 784 (10%) | 168 (16%) | 250 (9%) | 146 (8%) | 220 (13%) | 1.71 (1.02–2.86)* | 0.041 |
 Injectables | 3980 (53%) | 549 (52%) | 1534 (55%) | 941 (49%) | 956 (54%) | 1.81 (1.1–2.96)* | 0.019 |
Condom use at last sex | |||||||
 Yes | 4850 (66%) | 704 (70%) | 1859 (68%) | 1079 (58%) | 1208 (70%) |  |  |
 No | 2491 (34%) | 303 (30%) | 877 (32%) | 792 (42%) | 519 (30%) | 1.09 (0.998–1.19) | 0.056 |
Any STI | |||||||
 No | 6193 (82%) | 900 (85%) | 2293 (82%) | 1569 (81%) | 1431 (81%) | – |  |
 Yes | 1356 (18%) | 156 (15%) | 511 (18%) | 361 (19%) | 328 (19%) | 1.04 (0.87–1.23) | 0.664 |
Number of sex partners | |||||||
 1 | 3929 (86%) | 547 (89%) | 1491 (86%) | 1108 (85%) | 783 (84%) | 1 |  |
 2+ | 661 (14%) | 69 (11%) | 238 (14%) | 199 (15%) | 155 (16%) | 1.48 (1.25–1.75)* | < 0.001 |
Parity | |||||||
 0 | 757 (13%) | 79 (10%) | 342 (13%) | 170 (11%) | 166 (14%) | 1.23 (0.91–1.68) | 0.18 |
 1 | 2610 (43%) | 340 (42%) | 1075 (43%) | 634 (43%) | 561 (46%) | 1.13 (0.87–1.46) | 0.356 |
 2 | 1348 (22%) | 212 (26%) | 528 (21%) | 326 (22%) | 282 (23%) | 1.09 (0.85–1.39) | 0.489 |
 3+ | 1317 (22%) | 175 (22%) | 575 (23%) | 358 (24%) | 209 (17%) |  |  |
Married/Cohabiting | |||||||
 No | 4467 (74%) | 478 (59%) | 1890 (75%) | 1145 (77%) | 954 (78%) | 1.54 (1.28–1.84)* | < 0.001 |
 Yes | 1564 (26%) | 327 (41%) | 629 (25%) | 344 (23%) | 264 (22%) | 1 |  |