The 2 groups will be comparable in terms of age, gender, and body mass index (BMI); the ranges for comparison will be obtained from the pooled demographic data of the renally impaired subjects. The mean age of Group B will be within 5 years of the mean age of Group A, the mean BMI of Group B will be within 18% of the mean BMI of Group A, and the ratio of men to women in Group B will be the same as in Group A.