Table 2. Performance of CKD-Epi and aMDRD equations in predicting GFR at inclusion in 111 ADPKD patients as a whole and ranked according to mGFR<70 (n = 45) and ≥70 (n = 66) mL/min/1.73 m².

		Overall	mGFR<70	mGFR≥70
CKD-Epi	Estimated GFR	81.37±29.39∧	52.85±12.58	100.82±20.18∧
	Bias	2.81±12.32	0.85±7.99	4.15±14.46
	Mean % Error	3.84±15.74	2.15±14.91	4.98±16.30
	Mean Absolute % Error	12.50±10.24	11.94±9.01	12.88±11.06
	Scatter	7.01	4.69	9.88
	Mean Absolute Differences	9.58±8.20	6.26±4.96	11.84±9.18
	Estimates within 10%	51.35	51.11	51.52
	Pearson Coefficient	0.908	0.775	0.715
	Lin Coefficient	0.899	0.760	0.692
aMDRD	Estimated GFR	73.01±27.95*	47.82±10.39*	90.18±22.59°
	Bias	−5.55±12.79	−4.17±7.08	−6.49±15.51
	Mean % Error	−6.93±14.69	−7.23±13.01	−6.72±15.82
	Mean Absolute % Error	13.32±9.23	11.76±9.01	14.38±9.29
	Scatter	8.92	4.60	11.24
	Mean Absolute Differences	10.76±8.82	6.34±5.18	13.77±9.53
	Estimates within 10%	41.44	51.11	34.85
	Pearson Coefficient	0.891	0.770	0.729
	Lin Coefficient	0.872	0.712	0.672

Iohexol plasma clearance: overall: 78.56±26.70 mL/min/1.73 m²; GFR<70: 51.99±10.49 mL/min/1.73 m²; GFR≥70: 96.67±17.63 mL/min/1.73 m².

Data are mean±SD or median.

Estimated GFR, Bias, Scatter and Mean Absolute Differences are in mL/min/1.73 m².

^*p<0.001;

^°p<0.01;

^∧p<0.05 vs. iohexol plasma clearance.