Fig. 2

Sensitivity analysis to estimate the effect of the misclassification of patients with RA who did not meet the definition of “possible cases of RA” as those having no RA on the prevalence of definition-positive patients and the adjusted prevalence. F: the proportion of patients with RA included in “possible cases of RA”; P1: true prevalence of patients with RA in the future study to estimate the prevalence of RA; P*: the prevalence of the definition-positive patients with RA; Padj: the adjusted prevalence of the patients with RA using the method of the quantitative bias analysis; RA: rheumatoid arthritis