- Patients with significant diseases other than renal impairment were excluded. A significant disease was defined as a disease which in the opinion of the investigator put the patient at risk during participation in the study, could influence the results of the study, could influence the patient's ability to participate in the study, or was an unstable condition. Patients with diabetes (for Groups 1 to 5) or hypertension could be included in the trial if the disease was not significant according to these criteria.