Table 2.

Nationally representative percentiles of the serum cystatin C and serum creatinine distribution in NHANES III adolescents aged 12 to 19 yr overall, as well as by gender and ethnicity

Parameter	na	1st	2.5th	5th	25th	50th	75th	95th	97.5th	99th
Serum cystatin C (mg/L) weighted percentiles
overall	719	0.59	0.61	0.64	0.75	0.83	0.93	1.05	1.11	1.12
male	337	0.63	0.66	0.71	0.81	0.88	0.98	1.07	1.12	1.15
female	382	0.55	0.60	0.62	0.71	0.79	0.86	1.00	1.02	1.08
non-Hispanic white	184	0.60	0.63	0.69	0.79	0.85	0.94	1.05	1.11	1.12
male	82	N/A	0.70	0.71	0.83	0.89	0.98	1.08	1.12	N/A
female	102	N/A	0.60	0.64	0.74	0.81	0.88	1.00	1.01	N/A
non-Hispanic black	255	0.58	0.61	0.63	0.70	0.78	0.89	1.03	1.08	1.09
male	119	N/A	0.63	0.67	0.78	0.86	0.94	1.05	1.09	N/A
female	136	N/A	0.60	0.62	0.68	0.73	0.8	0.96	0.99	N/A
Mexican American	244	0.51	0.55	0.59	0.72	0.79	0.88	1.03	1.07	1.17
male	122	N/A	0.57	0.69	0.78	0.84	0.94	1.07	1.12	N/A
female	122	N/A	0.51	0.59	0.65	0.74	0.81	0.89	0.92	N/A
Serum creatinine (mg/dl) weighted percentiles
overall	719	0.39	0.49	0.49	0.58	0.68	0.78	0.97	1.06	1.06
male	337	0.39	0.39	0.49	0.68	0.78	0.87	0.97	1.06	1.16
female	382	0.49	0.49	0.49	0.58	0.68	0.78	0.87	0.87	0.97
non-Hispanic white	184	0.39	0.49	0.49	0.58	0.68	0.78	0.97	0.97	1.06
male	82	N/A	0.39	0.49	0.58	0.78	0.87	0.97	1.06	N/A
female	102	N/A	0.49	0.49	0.58	0.68	0.78	0.87	0.87	N/A
non-Hispanic black	255	0.49	0.49	0.54	0.68	0.78	0.87	1.06	1.16	1.16
male	119	N/A	0.49	0.58	0.68	0.87	0.97	1.16	1.16	N/A
female	136	N/A	0.49	0.49	0.58	0.68	0.78	0.87	0.87	N/A
Mexican American	244	0.30	0.39	0.49	0.58	0.68	0.78	0.97	0.97	1.06
male	122	N/A	0.39	0.49	0.68	0.78	0.87	0.97	1.06	N/A
female	122	N/A	0.39	0.39	0.49	0.58	0.68	0.87	0.87	N/A

^aSample size (n) denotes the number of individuals used to obtain the nationally representative estimates presented here. Gender- and ethnicity-specific estimates for the 1st and 99th percentiles of the serum cystatin C distribution are not available (N/A) because there are too few individuals for reliable estimation.