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Table 5 Transmission knowledge (percentage of correct answers) among both vaccinated and unvaccinated participants in the first and last rounds

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

  Round 1a Round 5   
Category n (%) n (%) p-value Mean difference (+ 95% CI)
Transmission knowledge score (mean 95%CI)
 Unvaccinated 7.47 (7.39–7.55) 7.52 (7.40–7.63) 0.60 Ref
 Vaccinated 7.39 (7.33–7.45) 7.53 (7.46–7.61) 0.01 0.01 (−0.10–0.10)
HPV can be transmitted by
Holding Hands (No)
 Unvaccinated 1002 (99) 481 (99)   
 Vaccinated 1882 (99) 1034 (99)   
Deep throat kissing (No)
 Unvaccinated 911 (90) 449 (92)   
 Vaccinated 1711 (90) 968 (93)   
Skin-to-skin contact (Yes)
 Unvaccinated 95 (9) 36 (7)   
 Vaccinated 185 (10) 71 (7)   
Stroking partner at genitals (Yes)
 Unvaccinated 340 (34) 126 (26)   
 Vaccinated 587 (31) 258 (25)   
Public toilet (No)
 Unvaccinated 836 (83) 427 (88)   
 Vaccinated 1575 (82) 927 (89)   
Unprotected oral sex (Yes)
 Unvaccinated 631 (62) 294 (61)   
 Vaccinated 1219 (64) 640 (62)   
Unprotected vaginal sex (Yes)
 Unvaccinated 967 (95) 469 (96)   
Vaccinated 1818 (95) 1004 (97)   
Unprotected anal sex (Yes)
 Unvaccinated 718 (71) 349 (70)   
 Vaccinated 1345 (70) 766 (71)   
Sex with a condom (Yes)
 Unvaccinated 156 (15) 95 (20)   
 Vaccinated 238 (12) 157 (15)   
Sharing a spoon or cup (No)
 Unvaccinated 962 (95) 464 (95)   
 Vaccinated 1777 (93) 999 (96)   
Sneezing/coughing (No)
 Unvaccinated 959 (95) 470 (97)   
 Vaccinated 1794 (93) 1010 (97)   
  1. Questions regarding transmission knowledge were only incorporated in the questionnaires of round one (first) and round five (last). 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]