Table 2.

Cognitive Function at Baseline Over Strata of CKD stages and Overall

	Total n = 5796	CKD stages based on eGFR (ml/min/1.73m2)				P-value*
		Stage 4 n = 19	Stage 3b n = 786	Stage 3a n = 2306	Stage 1 and 2 n = 2685
Stroop-Colour-Word Test	66.5 ± 0.4	74.2 ± 6.7	66.4 ± 0.9	63.2 ± 0.5	69.3 ± 0.6	< 0.001
Letter-Digit Coding Test	23.1 ± 0.1	21.9 ± 1.2	23.3 ± 0.3	24.4 ± 0.2	21.9 ± 0.2	< 0.001
Picture-Word Learning Test – immediate	9.3 ± 0.03	8.6 ± 4.7	9.3 ± 0.07	9.4 ± 0.04	9.2 ± 0.03	0.001
Picture-Word Learning Test – delayed	10.1 ± 0.04	9.8 ± 0.8	10.0 ± 0.1	10.2 ± 0.05	10.1 ± 0.04	0.197
The Barthel index	19.8 ± 0.01	19.7 ± 0.13	19.7 ± 0.03	19.8 ± 0.01	19.8 ± 0.01	0.004
Instrumental Activities of Daily Living	13.6 ± 0.01	13.3 ± 0.31	13.5 ± 0.04	13.7 ± 0.02	13.6 ± 0.02	0.008

All values are presented as mean ± SE. * p-values of differences between groups were assessed using an one-way ANOVA test. Abbreviations: CKD Chronic kidney disease, eGFR estimated glomerular filtration rate, SE Standard error