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Table 6 Knowledge of the consequences (percentage of correct answers) of HPV vaccination reported by vaccinated and unvaccinated girls

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   
Category n (%) n (%) n (%) n (%) n (%) p-value Mean difference (+ 95% CI)
HPV vaccination score (mean 95%CI)
 Unvaccinated 2.50 (2.45–2.54) 2.46 (2.40–2.52) 2.59 (2.53–2.65) 2.60 (2.54–2.65) 2.67 (2.62–2.73) < 0.01 Ref
 Vaccinated 2.44 (2.41–2.47) 2.40 (2.36–2.43) 2.50 (2.46–2.53) 2.54 (2.51–2.57) 2.67 (2.64–2.71) < 0.01 (b1) -0.07 (−0.12--0.01)
        (b2) 0.03 (0.02–0.04)
        (b3) 0.02 (0.00–0.04)
Vaccination protects against all HPV types (No)
 Unvaccinated 701 (70) 416 (63) 384 (69) 388 (69) 360 (75)   
 Vaccinated 1110 (58) 638 (48) 665 (55) 697 (58) 753 (73)   
HPV vaccination protects against all STIs (No)
 Unvaccinated 865 (86) 574 (88) 518 (93) 520 (93) 454 (95)   
 Vaccinated 1702 (89) 1246 (94) 1144 (95) 1159 (97) 1008 (97)   
Condoms are not needed anymore once vaccinated (No)
 Unvaccinated 939 (94) 623 (95) 542 (97) 545 (98) 468 (98)   
 Vaccinated 1842 (97) 1297 (98) 1187 (99) 1186 (99) 1016 (98)   
  1. The p-values of vaccinated and unvaccinated indicate whether the knowledge changed over time within these groups
  2. aPreviously published by Mollers et al. [17]
  3. bSignificant interaction between time and vaccination status; 1: difference for vaccination status at round one, 2: difference for round, 3: difference for interaction between vaccination status and round