General characteristics of 872 drug users at entry in the study
| Patient characteristics | Total (n=872) (%) | HIV positive (n=872) (%) | HIV negative (n=872) (%) | χ2 p value |
|---|---|---|---|---|
| Gender | >0.05 (NS) | |||
| female | 358 (41.1) | 91 (40.4) | 267 (41.3) | |
| male | 514 (58.9) | 134 (59.6) | 380 (58.7) | |
| Age | >0.05 (NS) | |||
| ⩽27 | 292 (33.5) | 60 (26.7) | 232 (35.9) | |
| 28–32 | 276 (31.7) | 83 (36.9) | 193 (29.8) | |
| ⩾33 | 304 (34.9) | 82 (36.4) | 222 (34.3) | |
| Nationality | 0.0005 | |||
| Dutch | 634 (72.7) | 140 (62.2) | 494 (76.4) | |
| German | 126 (14.4) | 51 (22.7) | 75 (11.6) | |
| other | 112 (12.8) | 34 (15.1) | 78 (12.1) | |
| Ethnicity1-150 | 0.002 | |||
| western European | 672 (77.1) | 174 (77.3) | 498 (76.2) | |
| Surinamese or Antillean | 76 (8.7) | 7 (3.1) | 69 (10.7) | |
| other | 57 (6.5) | 19 (8.4) | 38 (5.9) | |
| Intravenous drug use | <0.0001 | |||
| ever injected | 710 (81.4) | 217 (96.4) | 493 (76.2) | |
| never injected | 162 (18.6) | 8 (3.6) | 154 (23.8) | |
| Duration of residence in Amsterdam1-150 | 0.02 | |||
| ⩽4 years | 232 (26.6) | 48 (21.3) | 184 (28.4) | |
| 5–14 years | 259 (29.7) | 81 (36.0) | 178 (27.5) | |
| ⩾15 years | 293 (33.6) | 70 (31.0) | 223 (34.5) | |
| Other characteristics | ||||
| mean follow up period in years (SD) | 4.2 (3.0) | 4.2 (2.8) | 4.3 (3.1) | >0.05 (NS) |
| mean number of cohort visits (SD) | 10.9 (7.4) | 11.6 (7.2) | 10.7 (7.4) | >0.05 (NS) |
↵1-150 Because of missings these variables do not add up to the total.