Fig. 6

Publication bias assessment: a funnel plot of the 16 estimates of HPV types available for meta-analysis (SE—standard error, ES—effect size: prevalence), b funnel plot of the 13 estimates of high risk HPV types available for meta-analysis, c funnel plot of the 6 estimates of low risk HPV types available for meta-analysis. In this plot, the blue broken line indicates Pseudo 95% CI, the solid red line indicates pooled estimate of the prevalence of HPV, and the scattered circle dots indicates included studies in the meta-analysis. The scale on the X-axis indicates Effect size estimate or proportion and the Y-axis indicates the precision estimate using standard Error