Bootstrap confidence intervals for RVs of SF-12 RP, KDQOL Burden, and QDIS-CKD Static-34 by number of bootstrap replicates. The sample size, denominator F-statistic, and correlation with reference measure were fixed as in Table 1. The vertical bars present the confidence intervals with upper and lower bounds. The dots on the vertical bars represent the point estimates of RVs. Abbreviations: RV, relative validity; SF-12, Short Form 12; RP, role physical; KDQOL, kidney disease quality-of-life; QDIS, quality-of-life disease impact scale; CKD, chronic kidney disease.