Table 2: Performance of estimating equations.

Bias (mL/min/1.73 m2)IQR (mL/min/1.73 m2)P30

Normal (BMI < 30) ( 𝑛 = 8 3 )
 Cockcroft-Gault CrCl 1 9 . 7 ± 2 . 6 35.364%
 MDRD eGFR 1 0 . 2 ± 2 . 7 35.671%
 CKD-EPI eGFR 6 . 5 ± 2 . 7 35.376%

Class I Obesity (BMI 30–35) ( 𝑛 = 4 9 )
 Cockcroft-Gault CrCl 1 7 . 4 ± 3 . 6 36.561%
 MDRD eGFR 0 . 5 4 ± 3 . 9 36.069%
 CKD-EPI eGFR 3 . 0 ± 3 . 9 37.969%

Class II/III Obesity ( B M I > 3 5 ) ( 𝑛 = 3 2 )
 Cockcroft-Gault CrCl 1 5 . 9 ± 3 . 8 31.966%
 MDRD eGFR 1 5 . 0 ± 4 . 3 37.362%
 CKD-EPI eGFR 1 9 . 2 ± 4 . 1 35.756%

Abbreviations: Bias—(measured GF-estimated GFR); IQR—interquartile range; BMI—body mass index (kg/m2); P30—percentage of estimated readings within 30 percent of measured reading; CrCl—creatinine clearance; MDRD—modification of diet in renal disease; CKD-EPI—chronic kidney disease epidemiology collaboration; eGFR—estimated glomerular filtration rate.