Table I.

Comparison of blood cystatin-C levels by ages in healthy volunteers.

	Age, years
Sex	21–30	31–40	41–50	51–60	61–70	Total
Male
Number, n	10	10	13	5	2	40
Mean ± SD	0.67±0.10	0.76±0.07	0.78±0.09	0.71±0.04	0.66±0.02	0.73±0.09
Median	0.68	0.77	0.77	0.71	0.66	0.74
Female
Number, n	12	16	10	2	0	40
Mean ± SD	0.60±0.09	0.65±0.09	0.55±0.07	0.67±0.03	–	0.61±0.09
Median	0.61	0.65	0.55	0.67	–	0.61

SD, standard deviation.