Study to Assess Darbepoetin Alfa Dosing for the Correction of Anemia in Pediatric Subjects With Chronic Kidney Disease

The primary objectives of this study are the following: 1. To test if the proportion of subjects achieving a hemoglobin value greater than or equal to 10.0 g/dL at any time point after the first dose during the study is greater than 0.8 when administered de novo darbepoetin alfa QW for treatment of anemia in pediatric subjects with chronic kidney disease receiving and not receiving dialysis, and 2. To test if the proportion of subjects achieving a hemoglobin value greater than or equal to 10.0 g/dL at any time point after the first dose during the study is greater than 0.8 when administered de novo darbepoetin alfa Q2W for treatment of anemia in pediatric subjects with chronic kidney disease receiving and not receiving dialysis.