title: Implications of using Cockcroft-Gault and Modification of Diet in Renal Disease Study equations to estimate renal function in ethnic Korean patients.
abstract: OBJECTIVE
  Variations in renal function calculations performed with different estimating equations were investigated using data on a large nationally representative sample of Korean adults.
  
  
  METHODS
  A retrospective, cross-sectional, population-based analysis was conducted using 2007-09 data from the Korea National Health and Nutrition Examination Survey. Estimated creatinine clearance (CIcr) values for the study sample (n = 16,002) were calculated using the Cockcroft-Gault (CG) formula, and glomerular filtration rate estimates were performed using the four-variable Modification of Diet in Renal Disease (MDRD) Study equation, with normalization of values for body surface area. Renal function estimates derived from the CG and MDRD equations were compared among subgroups; rates of disagreement in the categorization of subjects for medication dose adjustments according to widely used CIcr cutoff values were analyzed.
  
  
  RESULTS
  In the study sample as a whole and all evaluated subgroups, renal function estimates performed via the CG and MDRD equations differed significantly (p < 0.001); the greatest differences were seen in calculated values for the elderly, patients with diabetes, and those with a body mass index of ≥25 kg/m(2) or a serum creatinine concentration of <1 mg/dL. Maximum rates of disagreement in dosage-adjustment categorizations by the CG and MDRD equations were observed at the highest CLcr cutoff values and ranged from 6.7% to nearly 20%.
  
  
  CONCLUSIONS
  The study revealed disagreements in renal function estimates performed using CG and MDRD equations in a large sample of ethnic Korean adults, with more pronounced differences observed in certain subgroups.
authors.affiliation: Hyun Soon Sohn, Ph.D., is Lecturer, College of Pharmacy, Ajou University, Suwon, Republic of Korea. Jin-Won Kwon, Ph.D., is Assistant Professor, College of Pharmacy, Kyungpook National University, Daegu, Republic of Korea. Hun-Sung Kim, M.D., is Clinical Assistant Professor, College of Medicine, The Catholic University of Korea, Seoul. Hyunah Kim, Pharm.D., is Assistant Professor, College of Pharmacy, Sookmyung Women's University, Seoul.
authors.forename: Hyun Soon
authors.initials: HS
authors.lastname: Sohn
authors.affiliation: Hyun Soon Sohn, Ph.D., is Lecturer, College of Pharmacy, Ajou University, Suwon, Republic of Korea. Jin-Won Kwon, Ph.D., is Assistant Professor, College of Pharmacy, Kyungpook National University, Daegu, Republic of Korea. Hun-Sung Kim, M.D., is Clinical Assistant Professor, College of Medicine, The Catholic University of Korea, Seoul. Hyunah Kim, Pharm.D., is Assistant Professor, College of Pharmacy, Sookmyung Women's University, Seoul.
authors.forename: Jin-Won
authors.initials: JW
authors.lastname: Kwon
authors.affiliation: Hyun Soon Sohn, Ph.D., is Lecturer, College of Pharmacy, Ajou University, Suwon, Republic of Korea. Jin-Won Kwon, Ph.D., is Assistant Professor, College of Pharmacy, Kyungpook National University, Daegu, Republic of Korea. Hun-Sung Kim, M.D., is Clinical Assistant Professor, College of Medicine, The Catholic University of Korea, Seoul. Hyunah Kim, Pharm.D., is Assistant Professor, College of Pharmacy, Sookmyung Women's University, Seoul.
authors.forename: Hun-Sung
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Hyun Soon Sohn, Ph.D., is Lecturer, College of Pharmacy, Ajou University, Suwon, Republic of Korea. Jin-Won Kwon, Ph.D., is Assistant Professor, College of Pharmacy, Kyungpook National University, Daegu, Republic of Korea. Hun-Sung Kim, M.D., is Clinical Assistant Professor, College of Medicine, The Catholic University of Korea, Seoul. Hyunah Kim, Pharm.D., is Assistant Professor, College of Pharmacy, Sookmyung Women's University, Seoul. hyunah@sookmyung.ac.kr.
authors.forename: Hyunah
authors.initials: H
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D044466:Asian People; D003404:Creatinine / Q000097:blood / Q000652:urine; D003430:Cross-Sectional Studies; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D007674:Kidney Diseases / Q000503:physiopathology*; D007677:Kidney Function Tests / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys; D012189:Retrospective Studies; D055815:Young Adult
chemical_list: D003404:Creatinine