TABLE 4

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

Follow-up Time PointsAdolescent Vaccinated at Least Once, n (%)Adolescent Not Vaccinated at Least Once, n (%)Mean (95% CI) Knowledge Scorest TestPR2Exact Log Reg OR (95% CI)C-statistica
Among Those VaccinatedAmong Those Not Vaccinated
Three-month7 (3.32)204 (96.68)8.14 (5.10–11.18)6.33 (5.77–6.89)−1.17.250.0061.12 (0.92–1.36)0.63
Six-month18 (8.53)193 (91.47)6.56 (4.86–8.26)6.37 (5.79–6.96)−.18.860.00011.01 (0.90–1.14)0.51
Nine-month25 (11.85)186 (88.15)7.20 (5.74–8.66)6.28 (5.68–6.87)−1.07.290.00541.057 (0.95–1.18)0.56
Twelve-month32 (15.17)179 (84.83)7.03 (5.81–8.24)6.27 (5.66–6.89)−.97.330.00451.047 (0.954–1.149)0.55
  • N = 211 adolescents. “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.