The 74 girls in this study were ages 14–17 years (Mean=15.5, SD=1.1) and 83% identified as Black, 9% as white, and 7% as mixed ethnicities or Hispanic, which reflects the racial/ethnic makeup of the clinics. Most of the participants were sexually active before enrollment (76%) and 75% reported sexual intercourse within the previous two months.
Medical records showed that 89% (66/74) of girls had received the first dose of HPV vaccine, 78% (58/74) had received the second dose, and 65% (48/74) had received all three doses. However, only 36 of the 66 adolescents who received vaccine reported getting vaccinated (sensitivity = 0.54) and only 50 mothers of 66 vaccinated adolescents accurately reported that their daughters received HPV vaccine (sensitivity = 0.76). Moreover, only 17 of the 48 adolescents (35%) who received all 3 doses accurately reported completing the vaccine series, with 20/48 (42%) saying that they had received no vaccine at all. Their mothers were only slightly more accurate, with 25/48 (52%) correctly indicating their daughter had received all 3 vaccine doses and 9 (19%) reporting that their daughter had received no vaccine. For those whose medical records indicated no vaccination, all 8 mothers and daughters accurately reported no doses of vaccine (specificity = 1.0). Predictive values are reported in .
Sensitivity and specificity of girls’ and mothers’ self-reported HPV vaccination status for 1st dose of vaccine (n = 74)
Of the adolescents who were vaccinated and did not receive their first dose on the day of the survey (n = 59), girls who were accurate in their self-reported vaccination status (≥1 dose) were not more likely to have been sexually active in the past two months (p = .75), or have more sexual partners in that timeframe (p = .81). Among the 66 daughters who had received any HPV vaccine, mothers who inaccurately reported no receipt of vaccine had lower HPV knowledge scores compared to accurate reporters [F(1,65) = 5.21; p = .02]. HPV knowledge scores were unrelated to accuracy of reporting among the daughters. Age of the girls, and times since first or last sex were not related to accuracy of self-report.