Table 3.
Condom use with steady or casual partner among sexually active participants
| Round 1a | Round 2 | Round 3 | Round 4 | Round 5 | OR (+ 95% CI) | aORb (+ 95%CI) | ||
|---|---|---|---|---|---|---|---|---|
| Category | n (%) | n (%) | n (%) | n (%) | n (%) | p-value | ||
| Always using a condom with steady partner during previous 6 months | ||||||||
| Unvaccinated | 67 (19) | 59 (22) | 41 (17) | 40 (14) | 34 (14) | < 0.01 | Ref | Ref |
| Vaccinated | 126 (17) | 77 (13) | 79 (14) | 65 (10) | 53 (9) | < 0.01 | 0.71 (0.57–0.89) | 0.71 (0.57–0.90) |
| Always using a condom with a casual partner during previous 6 months | ||||||||
| Unvaccinated | 75 (28) | 27 (28) | 17 (22) | 27 (32) | 20 (26) | 0.12 | Ref | Ref |
| Vaccinated | 144 (28) | 50 (31) | 51 (30) | 67 (29) | 44 (23) | 0.97 | 1.00 (0.79–1.28) | 1.00 (0.78–1.28) |
| Always using a condom during previous 6 months (combined for casual and steady partner) | ||||||||
| Unvaccinated | 93 (20) | 75 (22) | 56 (18) | 59 (18) | 50 (16) | < 0.01 | Ref | Ref |
| Vaccinated | 197 (21) | 113 (17) | 117 (16) | 107 (14) | 90 (12) | 0.02 | (c1) 1.01 (0.80–1.27) | 0.85 (0.70–1.02) |
| (c2) 0.91 (0.85–0.99) | ||||||||
| (c3) 0.91 (0.82–1.00) | ||||||||
The p-value indicates whether there is a significant change over time. The OR indicates possible differences between vaccinated and unvaccinated participants overall (across all time points)
aPreviously published by Mollers et al. [17]
bOR adjusted for urbanisation degree and alcohol use
cSignificant interaction between time and vaccination status; 1: OR for vaccination status at round one, 2: OR for round 3, 3: OR for interaction between vaccination status and round