Table 1

Demographic information of the sample stratified by city of enrolment (N=928)

 Northeastern cityMidwestern citySouthern city
(n=269)(n=248)(n=411)
Mean Age/SD and IQR*22.8 (7.1) (18–25)36.3 (11.6) (25.5–47)29.0 (9.0) (22–35)
Female gender172 (63.9%)126 (50.6%)214 (52.1%)
Black race95 (35.3)198 (79.8)214 (52.1)
Mean # sex partners, 3M†2.0 (1.7) (1–2)2.9 (5.0) (1–3)3.5 (8.6) (1–3)
Mean # sex partners, LT‡14.9 (25.9) (4–15)39.2 (44.3) (1–50)33.7 (38.2) (10–40)
  • *Mean age in years, SD and IQR.

  • †Mean number of penile-vaginal sex partners in the 3 months preceding enrolment, SD and IQR.

  • ‡Mean number of penile-vaginal sex partners over the lifetime (LT), SD and IQR.