Table 1.

Distribution of cystatin C levels in different sex and age.

Variable	Category	N (%)	CysC (mg/L)		Statistic	P
			Mean	SD
total	―	481	0.904	0.110	―	―
sex	boys	199 (41.4)	0.965	0.104	t = 11.787	<0.001
	girls	282 (58.6)	0.860	0.091
age	14	13 (2.7)	0.875	0.079	F = 1.145	0.330
	15	142 (29.5)	0.916	0.112
	16	247 (51.4)	0.901	0.104
	17	79 (16.4)	0.894	0.124

CysC, cystatin C; SD, standard deviation.