The overall search yield along with the number of abstracts identified and articles reviewed for each topic are presented in Table 8. Data extraction Data extraction was done by the ERT. The ERT, in consultation with the Work Group, designed forms to capture data on design, methodology, sample characteristics, interventions, comparators, outcomes, results, and limita- tions of individual studies. Methodology and outcomes were also systematically graded (see the section on grading below) and recorded during the data extraction process. Summary tables Summary tables were developed for each comparison of interest (Table 9). Studies included in the evidence base for the KDOQI Clinical Practice Guidelines on Hypertension and Antihypertensive Agents in Chronic Kidney Disease1 were also incorporated if they fulfilled the inclusion criteria for the current KDIGO Guideline. Summary tables contain outcomes of interest, relevant population characteristics, description of intervention and comparator, results, and quality grading for each outcome. Categorical and continuous outcomes were summarized separately. Studies done exclusively in patients of a single race or ethnicity and studies reporting effect modifications by baseline urine protein level were annotated. 