Table 1.
Characteristics of a sample of HIV-infected people (n = 1154) participating in the Variant, Atypical, and Resistant HIV Surveillance system, stratified by presence in a cluster, Chicago, Illinois, 2005-2011
| Characteristic | No. of Participants (Column %) | No. of Participants, by Clustera (Row %) | P Value | |
|---|---|---|---|---|
| In a Cluster | Not in a Cluster | |||
| Total | 1154 (100.0) | 177 (15.3) | 977 (84.7) | |
| Age, y | ||||
| ≤24 | 87 (7.5) | 27 (31.0) | 60 (69.0) | <.001 |
| 25-29 | 188 (16.3) | 53 (28.2) | 135 (71.8) | |
| 30-39 | 348 (30.2) | 53 (15.2) | 295 (84.8) | |
| 40-49 | 263 (22.8) | 30 (11.4) | 233 (88.6) | |
| ≥50 | 268 (23.2) | 14 (5.2) | 254 (94.8) | |
| Sex | ||||
| Male | 880 (76.3) | 152 (17.3) | 728 (82.7) | .001 |
| Female | 274 (23.7) | 25 (9.1) | 249 (90.9) | |
| Race/ethnicity | ||||
| Non-Hispanic black | 764 (66.2) | 122 (16.0) | 642 (84.0) | .51 |
| Non-Hispanic white | 106 (9.2) | 13 (12.3) | 93 (87.7) | |
| Hispanic | 266 (23.1) | 41 (15.4) | 225 (84.6) | |
| Other | 18 (1.6) | 1 (5.6) | 17 (94.4) | |
| Transmission category | ||||
| MSM | 497 (43.1) | 115 (23.1) | 382 (76.9) | <.001 |
| Heterosexual | 30 (2.6) | 1 (3.3) | 29 (96.7) | |
| PWID | 57 (4.9) | 3 (5.3) | 54 (94.7) | |
| MSM and PWID | 229 (19.8) | 22 (9.6) | 207 (90.4) | |
| Otherb | 341 (29.5) | 36 (10.6) | 305 (89.4) | |
| Year of diagnosis | ||||
| 2000 or before | 41 (3.6) | 2 (4.9) | 39 (95.1) | .003 |
| 2001-2005 | 73 (6.3) | 2 (2.7) | 71 (97.3) | |
| 2006-2010 | 939 (81.4) | 156 (16.6) | 783 (83.4) | |
| After 2010 | 101 (8.8) | 17 (16.8) | 84 (83.2) | |
| Regionc | ||||
| North side | 268 (23.2) | 44 (16.4) | 224 (83.6) | .10 |
| South side | 401 (34.7) | 67 (16.7) | 334 (83.3) | |
| West side | 285 (24.7) | 47 (16.5) | 238 (83.5) | |
| Other | 200 (17.3) | 19 (9.5) | 181 (90.5) | |
Abbreviations: HIV, human immunodeficiency virus; MSM, men who have sex with men; PWID, person who injects drugs.
aDefined as a group of at least 2 people linked by at least 1 potential transmission event. A transmission event was defined as a genetic distance ≤1.5% between pol sequences.
b“Other” categories include received clotting factor, received transfusion/transplant, perinatal exposure with HIV diagnosed at age ≥13, and no identified or reported risk.
cDefined by ZIP code of residence at HIV diagnosis.