Baseline characteristics by time to HSV-2 seroincidence.^a

aHSV-2, herpes simplex virus type 2; PY, person-years; HR, hazard ratio. Among participants testing HSV-2 seronegative at baseline. Ns may not add up to column totals due to missing data. bUnadjusted HRs were derived from univariable models, while adjusted HRs were derived from multivariable models including variables that were statistically significant at the P<0.05 level in unadjusted analyses. Models were stratified by study site. cSexual behavior variables are shown at baseline for incidence estimates and were time-updated in models.