Randomized participants with an average hemoglobin (Hb) decrease from Baseline (Week -4 to Week -1) not exceeding 1.0 gram per deciliter (g/dL) and an absolute average Hb >= 10.5 g/dL during the evaluation period (Weeks 50-53) were defined as responders. Non-responders included participants without any Hb data during the second treatment period and those who did not meet the response criteria and thus were not included in the analysis.

ITT population included all randomized participants.

All participants received once monthly treatment schedule of both MIRCERA and darbepoetin alpha for the respective treatment arms after Week 27 and these analyses are based on the absolute doses. The average dose in Months 11 and 12 was defined as the mean of all administered doses between study Days 302 and 363. The change in dose was calculated as the percentage change between the respective dose at Week 27 and the average corresponding dose during Months 11 and 12 in each treatment group.

ITT population included all randomized participants. Data is presented for the participants available at the time of assessment.

Values of laboratory parameters higher (H) or lower (L) than the Roche defined reference range were considered as abnormality. The laboratory parameters with abnormality were platelets, white blood cells (WBC), albumin, aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and potassium. Blood samples were drawn before drug administration and before the dialysis session.

The Safety Population was defined as all participants who received at least one dose of methoxy polyethylene glycol-epoetin beta or darbepoetin alfa and had a safety follow-up, whether withdrawn prematurely or not. The 'n' represents the number of participants at a specified time point.

Systolic and diastolic blood pressures (BP) were measured before and after the dialysis session at every week from Baseline (Week -4 to Week -1) to Week 53. Median pre-dialysis diastolic blood pressure (PrD DBP) , median post-dialysis diastolic blood pressure (PoD DBP), median pre-dialysis systolic blood pressure (PrD SBP), and post-dialysis systolic blood pressure (PoD SBP) were reported at Baseline (Week -4 to Week -1) , Week 28 and Week 52.

Safety Population included all participants who received at least one dose of MIRCERA or darbepoetin alfa and had a safety follow-up, whether withdrawn prematurely or not. The 'n' represents the number of participants at a specified time point.

Pulse rate is defined as the number of heartbeats in a minute and was assessed in sitting position of the participants at every week from Baseline (Week -4 to Week -1) to Week 53. Summary data of mean values of pulse rate are presented at Baseline (Week -4 to Week -1), Week 28 and Week 52.

The Safety population was defined as all participants who received at least one dose of MIRCERA or darbepoetin alfa and had a safety follow-up, whether withdrawn prematurely or not. The 'n' represents the number of participants at a specified time point.

An adverse event (AE) can be any unfavorable and unintended sign (including an abnormal laboratory finding, for example), symptom, or disease temporally associated with the use of a pharmaceutical product, whether or not considered related to the pharmaceutical product. A serious adverse event (SAE) is any adverse event that can result in death or is life-threatening or required in participants hospitalization or prolongation of existing hospitalization or results in persistent or significant disability/incapacity; or is a congenital anomaly/birth defect; or is medically significant or requires intervention to prevent one or other of the outcomes listed above. SAEs were reported up to Week 56, while nonserious AEs up to Week 52.

The Safety Population was defined as all participants who received at least one dose of MIRCERA or darbepoetin alfa and had a safety follow-up, whether withdrawn prematurely or not. Among the 14 deaths in Darbepoetin alfa group, 3 participants died after withdrawal from the study and within 30 days after last dose of study drug.