Table 1.

Sample cohorts

Centre number	Centre	Short name	Sample number (case/control)	Age (mean)	Gender (male per case/control group)	Urinary albumin median (range) (mg/L) case	Urinary albumin median (range) (mg/L) control	eGFR median (range) (mL/min/1.73 m2) case	eGFR median (range) (mL/min/1.73 m2) control	Area under the curve (AUC, 95% CI)
1	Charite-Berlin	CHA	9/9	57/61	4/1	368 (11–8620)	11 (11–11)	72 (34–104)	87 (60–117)	1.00 (0.815–1.000)
2	Faculty University of Skopje	SKO	10/5	64/64	5/0	100 (0–100)	20 (0–20)	28 (10–48)	85 (83–111)	1.00 (0.782–1.000)
3	Hospital St Georg Leipzig	STG	12/7	62/54	7/4	538 (97–1633)	4 (0–20)	21 (7–50)	87 (63–111)	0.95 (0.747–0.999)
4	Charles University	CUP	10/10	n.a.	n.a	2043 (750–9500)a	6 (1–16)a	38 (19–61)	88 (62–160)	1.00 (0.832–1.000)
5	Diabetes Centre Prague	DCP	10/10	63/60	5/6	2115 (450–7780)b	8 (3–23)a	60 (22–110)	88 (60–131)	0.89 (0.670–0.984)
6	Mario Negri Institute	MAR	9/10	n.a.	n.a.	513 (217–2169)c	5 (3–8)c	38 (13–102)	98 (89–128)	0.96 (0.752–0.999)
7	Steno Diabetes Center	STE	9/10	n.a	n.a.	346 (3–1673)c	5 82–23)c	42 (18–87)	87 (68–90)	0.98 (0.786–1.000)
8	IIS-Fundación Jimenez Diaz	FJD-UTE	14/9	64/64	11/5	281 (2–2266)c	4 (0–14)c	43 (16–102)	71 (65–105)	0.90 (0.698–0.984)
9	Health Plus Abu Dhabi	Abu Dhabi	4/8	67/44 *	3/5	1517 (889–9895)	15 (1–29)	79 (19–123)	99 (72–139)	1.00 (0.74–1.00)

Given are the different centres with the number of collected samples and sample characteristics. In addition, the resulted AUC (area under the curve) values obtained using the CKD273 classification score for each centre are listed.

n.a., not available.

*P < 0.05 (for age the Mann–Whitney test, for gender Fisher's exact test was used).

^aAlbuminuria (mg/24 h).

^bProteinuria (mg/24 h).

^cAlbumin/creatinine ratio (mg/g).