Table 2.

Median (range) values for kidney function during the visits

Variable	First visit (n = 154 – 164)	Second visit (n = 115 – 164)	p value
S-cystatin-C, mg/l	0.76 (0.44 – 2.45)	1.1 (0.59 – 2.93)	<0.001
S-creatinine, μmol/l	81 (42 – 322)	91 (45 – 888)	<0.001
eGFR, ml/min/1.73 m2	81 (18 – 165)	73 (12 – 128)	<0.001

The Wilcoxon test was used for the comparison of two paired groups.