Table 1.
Characteristics of Participants in the Human Papillomavirus Infection and Transmission Among Couples Through Heterosexual Activity (HITCH) Cohort Study
| Characteristic | Women | Men | Dyad |
|---|---|---|---|
| (n = 501) | (n = 539) | (n = 492) | |
| Age at baseline, y, median (range) | 20 (18–26) | 22 (18–45) | |
| Born in Canada | 67.9% | 63.9% | |
| Vaccinated against HPV at baseline | 12.0% | 0.4% | |
| Lifetime No. of vaginal sex partners at baseline, median (IQR) | 5 (2–9) | 5 (3–11) | |
| Days between first vaginal sex with HITCH partner and baseline visit, median (IQR) | … | … | 118 (78–155) |
| No. of vaginal sex encounters with HITCH partner at baseline, median (IQR) | … | … | 60 (33–102) |
| Individuals positive for any HPV (6/11/16/18/31/42/51) during the first 2 visits | 37.9% | 39.3% | … |
| HPV concordance at baseline, no./No. (%) | … | … | 107/460 (23.3%) |
| HPV concordance at the second visit, no./No. (%) | … | … | 88/364 (24.2%) |
| Individuals with ≥1 incident HPV infection at the second visit, no./No. (%) | 42/445 (9.4%) | 43/352 (12.2%) | … |
| Individuals who cleared ≥1 HPV infection at the second visit, no./No. (%) | 54/150 (36.0%) | 45/134 (33.6%) | … |
Dyads were only included if the woman and her first male sexual partner had both provided a genital sample.
Abbreviations: HITCH, HPV Infection and Transmission Among Couples Through Heterosexual Activity; HPV, human papillomavirus; IQR, interquartile range.