Cohort behavior characteristics.

b Cochran-Armitage test.c Student’s t-test.d Change in condom use was measured as ‘frequency of use after diagnosis—‘frequency of use before diagnosis, with use coded as: 1 = every sexual encounter, 2 = frequent use (the majority of sexual encounters), 3 = infrequent use (minority of sexual encounters), and 4 = never used.e Data according to surveys of exposed partners.i Data according to surveys of index partners.Cohort behavior characteristics.