Table 8. Overview of the approaches to determine baseline SCr in the application of RIFLE classification in previous studies.

Study	No. of pts analyzed	Multi-/ single-center	Criteria used	Method to determine baseline SCr	% recorded	% estimated
Bagshaw25	120123	multi	cr+uo	estimated by MDRD formula	0	100
Ostermann30	41972	multi	cr	estimated by MDRD formula	0	100
Uchino5	20126	single	cr	retrieved from hospital database, or estimated by MDRD formula	N/A	N/A
Bell54	8152	single	cr+uo	retrieved from hospital database, or estimated by MDRD formula	N/A	N/A
Hoste2	5383	single	cr+uo	estimated by MDRD formula, or admission creatinine value, whatever was lower	N/A	N/A
Ali31	5321	multi	cr	retrieved from hospital database, or admission creatinine value	100	0
Cruz55	2164	multi	cr+uo	retrieved from hospital database, or estimated by MDRD formula	78	22
Perez-Valdivieso56	1008	single	cr	estimated by MDRD formula	0	100
Kuitunen57	813	single	cr+uo	preoperative value	100	0
Coca58	304	single	cr	the lowest s-creatinine value in the first 5 hospital days	100	0
Arnaoutakis59	267	single	N/A	N/A	N/A	N/A
Abosaif60	247	single	cr+uo	retrieved from hospital database, or admission creatinine value	100	0
Maccariello61	214	multi	cr+uo	retrieved from hospital database, or estimated by MDRD formula	N/A	N/A
Jenq62	134	single	cr+uo	admission creatinine value, or estimated by MDRD formula	90	10

cr, creatinine criteria; MDRD, Modification of Diet in Renal Disease; N/A, not available; pts, patients; SCr, serum creatinine; uo, urine output criteria.

Reprinted from Zavada J, Hoste E, Cartin-Ceba R et al. A comparison of three methods to estimate baseline creatinine for RIFLE classification. Nephrol Dial Transplant 2010; 25(12): 3911–3918 (Ref. 64) by permission from The European Renal Association-European Dialysis and Transplant Association; accessed http://ndt.oxfordjournals.org/content/25/12/3911.long