A systematic review with meta-analysis of parental interventions for human papillomavirus vaccine uptake

With the growing ability of pharmacists to vaccinate against HPV, this systematic review with meta-analysis examined the efficacy of interventions targeting parents of children and adolescents in the US to increase HPV vaccine uptake.

A systematic search of PubMed, Web of Science, SCOPUS, CINAHL, and Medline was conducted from January 2006 to January 2022.

We included parent-based randomized controlled trials (RCTs) in the US that measured actual HPV vaccine initiation and completion from patients' medical records.

The revised Cochrane risk-of-bias tool for randomized trials (RoB2) was used to assess studies for risk of bias, and the Michie and Prestwich Theory Coding Scheme will be used to assess the extent of theory use. Results were pooled using the inverse-variance heterogeneity model (IVhet).

Of 770 studies, 13 were included for data extraction, and 12 were included in the meta-analysis. Parent-based interventions, when compared to controls, did not demonstrate a statistically significant increase in HPV vaccine initiation (OR = 1.24, 95% CI [0.86, 1.77]) or completion (OR = 1.23, 95% CI [0.78, 1.96]). However, sensitivity analysis suggested parent-based RCTs could improve HPV vaccine initiation (OR = 1.19, 95% CI [0.16, 1.22]) but not completion (OR = 1.25, 95% CI [0.86, 1.81]), after removing cluster RCTs. Reminders/recall interventions showed a significant increase in HPV vaccine initiation (OR = 1.19, 95% CI [0.16, 1.22]) and completion (OR = 1.52, 95% CI [1.04, 2.21]). Eight studies reported theory use in intervention development. No statistically significant differences were observed between atheoretical versus non-theory-based trials.

Overall, parent-based interventions do not increase HPV vaccine uptake. Reminder and recall systems have the potential to improve HPV vaccine initiation and completion, and pharmacies can leverage these tools to improve vaccination. Behavioral theories and pharmacy-based HPV vaccination appear to be under-utilized.