Table 6.

Creatinine, cystatin C and cystatin C-estimated GFR before (pre), immediately after (post) and 14 days after (follow-up) the marathon ( n  = minimum of 155 study participants)

Parameter	Pre	Post	Follow-up	p (Pre vs. Post)	p (Pre vs. Follow-up)
Creatinine [mg/dL]	0.83 (0.75-0.93)	1.02 (0.88-1.26)	0.82 (0.72-0.92)	<0.001	0.003
Cystatin C [mg/dL]	0.68 (0.62-0.78)	0.85 (0.69-0.99)	0.66 (0.59-0.78)	<0.001	<0.001
Cystatin C-estimated GFR [mL/min]	125.1 (104.2-141.5)	93.7 (75.7-122.3)	130.2 (104.2-151.2)	<0.001	<0.001

Values are shown as median (IQR). Statistically significant values are marked in bold. GFR, glomerular filtration rate.