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Table 3 Condom use with steady or casual partner among sexually active participants

From: Changes in (risk) behavior and HPV knowledge among Dutch girls eligible for HPV vaccination: an observational cohort study

  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)  
  1. 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)
  2. aPreviously published by Mollers et al. [17]
  3. bOR adjusted for urbanisation degree and alcohol use
  4. 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