| |
Round 1a
|
Round 2
|
Round 3
|
Round 4
|
Round 5
| | | |
|---|
|
Category
|
n (%)
|
n (%)
|
n (%)
|
n (%)
|
n (%)
|
p-value
|
OR (+ 95% CI)
|
aORc (+ 95% CI)
|
|---|
|
Having had sex for the first time during previous 6 months
|
|
Unvaccinated
|
–
|
84 (22)
|
71 (20)
|
69 (18)
|
59 (17)
|
0.01
|
Ref
|
Ref
|
|
Vaccinated
|
–
|
216 (26)
|
166 (20)
|
170 (19)
|
179 (21)
|
< 0.01
|
1.15 (0.97–1.37)
|
1.14 (0.96–1.35)
|
|
Lifetime number of sexual partnersb (mean 95%CI)
|
|
Unvaccinated
|
2.2 (2.0–2.4)
|
2.5 (2.3–2.7)
|
2.7 (2.4–3.0)
|
3.0 (2.7–3.3)
|
3.4 (3.1–3.8)
|
< 0.01
|
Ref
|
Ref
|
|
Vaccinated
|
1.9 (1.8–2.0)
|
2.1 (2.0–2.3)
|
2.4 (2.3–2.6)
|
2.9 (2.7–3.1)
|
3.0 (2.8–3.2)
|
< 0.01
|
− 0.20 (− 0.41–0.00)b
|
−0.26 (− 0.46 – -0.05)
|
|
Having a steady partner at the moment
|
|
Unvaccinated
|
349 (67)
|
275 (71)
|
247 (68)
|
275 (72)
|
250 (72)
|
0.17
|
Ref
|
Ref
|
|
Vaccinated
|
729 (68)
|
586 (69)
|
576 (68)
|
622 (68)
|
578 (69)
|
0.34
|
0.96 (0.82–1.13)
|
1.02 (0.87–1.19)
|
|
Having had a casual partner during previous 6 months
|
|
Unvaccinated
|
271 (52)
|
96 (25)
|
77 (21)
|
82 (22)
|
81 (23)
|
< 0.01
|
Ref
|
Ref
|
|
Vaccinated
|
512 (48)
|
163 (19)
|
170 (20)
|
234 (26)
|
189 (23)
|
< 0.01
|
0.92 (0.80–1.06)
|
1.11 (0.96–1.29)
|
- 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 five time points)
- - Not asked in this round (Having had sex for the first time during previous 6 months was only questioned from round two onward)
- aPreviously published by Mollers et al. [17]
- bFor continuous variables, the mean difference was calculated. For other variables, odds ratios were calculated
- cOR was adjusted for degree of urbanization and alcohol use
