TABLE 3

Relationship Between HPV Vaccination Status at 3, 6, 9, and 12 Months and Parents’ Baseline Knowledge

Follow-up Time PointsAdolescent Vaccinated at Least Once, n (%)Adolescent Not Vaccinated at Least Once, n (%)Mean (95% CI) Knowledge Scorest TestP valueR2Exact Log Reg OR (95% CI)C-statistica
Among Those VaccinatedAmong Those Not Vaccinated
Three-month8 (5.37)141 (94.63)7.13 (2.92–11.33)7.66 (6.93–0.39).33.740.00080.97 (0.83–1.15)0.54
Six-month15 (10.07)134 (89.93)6.80 (4.01–9.59)7.72 (6.98–8.47).77.440.0040.95 (0.84–1.08)0.56
Nine-month18 (12.08)131 (87.92)7.28 (4.80–9.75)7.68 (6.93–8.43).36.720.00090.979 (0.88–1.10)0.52
Twelve-month20 (13.42)129 (86.58)7.70 (5.35–10.05)7.62 (6.87–8.37)−.08.940.00001.004 (0.90–1.12)0.51
  • N = 149 parents. “Vaccinated” refers to whether the adolescent had received at least 1 HPV vaccination dose during the follow-up period. CI, confidence interval; Exact Log Reg OR, exact logistic regression odds ratio;.

  • None of the potential confounder variables were significantly related to knowledge and vaccination behavior and were therefore not adjusted for.

  • a Association between predicted probabilities and observed response. The concordance index (C-statistic) is comparable to the area under the receiver operating characteristic curve.