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Table 3 Changes over time in risk behaviour, symptoms of sexually transmitted infection and HIV incidence, by group

From: Using surrogate vaccines to assess feasibility and acceptability of future HIV vaccine trials in men: a randomised trial in inner-city Johannesburg, South Africa

Behaviour Group Baseline (n = 150) Month 3 (n = 143) Month 6 (n = 139) Month 9 (n = 134) Month 12 (n = 135) P #
Median sexual partners in past 3 months IV 1 (1–2) 1 (1–2) 1 (1–2) 1 (1–2) 1 (1–2) 0.993
DV 1 (1–2) 1 (1–2) 1 (1–2) 1 (1–2) 1 (1–2)
P* 0.769 0.644 0.685 0.959 0.558
Median sexual acts in past 3 months IV 9 (3–21) 6 (2–12) 5.5 (2–12) 5 (2–10) 6 (3–15) -
DV 9 (3–20) 6 (3–14) 6 (3–11) 6 (3–11) 6 (3–12)
P* 0.795 0.339 0.392 0.489 0.972
Condom use in past 3 months IV 55 (73.3%) 56 (81.1%) 55 (80.9%) 50 (79.4%) 52 (81.3%) 0.461
DV 62 (82.7%) 60 (87.0%) 57 (85.1%) 58 (86.6%) 55 (84.6%)
P* 0.168 0.352 0.517 0.274 0.611
HIV-positive sex-partnera, c IV 2 (2.7%) 0 (0.0%) 0 (0.0%) 0 (0%) 0 (0.0%) 0.061
DV 3 (4.0%) 1 (1.3%) 2 (2.7%) 1 (1.3%) 2 (2.7%)
P* 0.500 0.500 0.248 0.500 0.248
Sexual acts while intoxicated in past 3 months IV 12 (16.0%) 16 (21.3%) 13 (17.3%) 17 (22.7%) 18 (24.0%) 0.233
DV 18 (24.0%) 19 (25.3%) 18 (24.0%) 20 (26.7%) 19 (25.3%)
P* 0.221 0.562 0.313 0.570 0.850
Incident HIV infectionb, c IV - 0 (0.0%) 0 (0.0%) 0 (0.0%) 0 (0.0%) 0.299
DV - 2 (2.7%) 1 (1.4%) 0 (0.0%) 0 (0.0%)
P* - 0.245 0.497 - -
  1. aWhere participant knows partner’s HIV status; *P value compares groups at every month; # P value across visits overall; b2 incident HIV infections at Month 2 in IV group; cFisher’s exact test