Comparison of SHAPE cohort participants with eligible non-respondents who were enrolled in the Drug Treatment Program
| Demographic variables | SHAPE participants (n=644), n (%) | Eligible non-respondents (n=7737), n (%) | P value |
| Age at baseline* | <0.001 | ||
| <30 | 25 (4) | 313 (4) | |
| 30–<40 | 92 (14) | 1078 (14) | |
| 40–<50 | 184 (29) | 1718 (22) | |
| ≥50 | 343 (53) | 4628 (60) | |
| Gender | <0.001 | ||
| Women | 139 (22) | 1294 (17) | |
| Men | 496 (77) | 6394 (83) | |
| Other | 9 (1) | 49 (1) | |
| Ethnicity | <0.001 | ||
| Caucasian | 467 (73) | 3012 (63) | |
| Indigenous | 101 (16) | 674 (14) | |
| Asian | 18 (3) | 429 (9) | |
| African, Caribbean and Black | 4 (1) | 240 (5) | |
| Other | 54 (8) | 428 (9) | |
| Missing value | – | 2954 | |
| History of injection drug use | 273 (42) | 2080 (33) | <0.001 |
| Missing value | 96 | 1382 | |
| Gay, bisexual or other MSM | 368 (57) | 3089 (52) | 0.01 |
| Missing value | – | 1776 |
*As of study enrolment date for SHAPE participants; as of 1 September 2018 for eligible non-respondents.
MSM, men who have sex with men; SHAPE, Seek and Treat for Optimal Prevention of HIV/AIDS Program Evaluation.