Description of the participants in the ITACA cohort of HIV-negative men who have sex with men recruited in a community-based voluntary counselling and testing service in Barcelona included in the current analysis (N=3544)*
| Years of enrolment | 2009–2011† | 2009† | 2010 | 2011 |
|---|---|---|---|---|
| Number of participants include in the analysis* | 3544 | 1259 | 781 | 1504 |
| Mean age at baseline, years (SD) | 32.7 (8.8) | 33.2 (8.5) | 32.1 (8.5) | 32.6 (9.2) |
| Spanish-born (%) | 66.6 | 65.3 | 65.7 | 68.1 |
| Higher education (%) | 57.1 | 57.8 | 57.5 | 56.3 |
| Homosexual | 89.4 | 92.9 | 90 | 86.1 |
| Employed | 74.0 | 78.1 | 72.3 | 71.3 |
| Number of seroconverters | 85 | |||
| Person-years of follow-up | 3567.09 | |||
| Median number of follow-up visits (IQR) | 1 (0–1) | |||
| Median time of follow-up, months (IQR) | 11 (5.8–16.7) | |||
| Median time between visits, months (IQR)‡ | 9.3 (4.8–12.3) | |||
| Median time to seroconversion, months (IQR)§ | 12.7 (8.4–20.8) |
December 2008–December 2011.
*Includes men with over two visits or those with a single visit and <1 year from that visit to the point of administrative censoring (31/12/2011).
†It includes data from December 2008.
‡Among men who report over two visits.
§Among 85 seroconverters during the study period.