Kaiser Family members Foundation. Kaiser Health News, an editorially independent news service, is a scheduled system of the Kaiser Family members Foundation, a nonpartisan health care policy research corporation unaffiliated with Kaiser Permanente.. AHRQ data display quality improving but disparities remain Modern Health care: Quality Improves, Disparities Linger: AHRQ The most recent data from the Company for Healthcare Analysis and Quality brought more of the usual news: modest benefits in health care quality but persistent racial and income disparities. Kentucky, Louisiana, New Mexico, Oklahoma and Texas had the smallest improvements in performance.Survival was analyzed from the time of transplantation to a maximum of 7 years, with kidney-graft loss as the function of interest. Data on graft survival were censored at the time of death. Cox proportional-hazards models were used to quantify hazard ratios and 95 percent self-confidence intervals for kidney-graft loss. The association of clinical, histologic, functional, and immunologic factors with graft reduction was assessed in separate multivariate and univariate Cox regression analyses. The factors identified in these analyses had been thereafter included in a final multivariable model with stepwise backward elimination. The predictive value that C1q-binding status added to a reference risk model was evaluated with the use of the C-statistic.