Fig. 3

A forest plot of the present meta-analysis on the incidence of solicited local symptoms after administration of HPV vaccines (2vHPV and 4vHPV) compared to placebo injection. Risk ratios (RRs) and 95% confidence intervals (CI) are shown. The analysis was performed using the Mantel-Haenszel method with random effects model. Abbreviations: HPV, human papillomavirus; 2vHPV, bivalent human papillomavirus; 4vHPV, quadrivalent human papillomavirus