Table 1. Descriptive statistics and HCC reference ranges (pg/mg) for the whole sample and by sex and age.

		Whole sample (n = 170)	Girls (n = 88)	Boys (n = 80)	12 years (n = 65)	13 years (n = 75)	14 years (n = 28)
Mean		3.26	4.00	2.44	3.01	3.62	2.86
Standard deviation		1.87	1.88	1.52	1.98	1.84	1.61
Minimum		0.07	0.20	0.07	0.20	0.07	0.37
Maximum		9.54	9.54	7.85	9.54	7.88	6.96
Percentile	10	0.92	1.58	0.70	0.59	1.26	0.88
	20	1.60	2.57	1.11	1.23	1.72	1.58
	25	1.80	2.74	1.47	1.55	2.03	1.67
	30	2.13	2.98	1.55	1.84	2.47	2.02
	40	2.62	3.34	1.82	2.46	2.98	2.34
	50	3.02	3.80	2.18	2.88	3.77	2.64
	60	3.54	4.30	2.60	3.25	4.26	2.83
	70	4.02	4.82	2.99	3.67	4.64	3.33
	75	4.36	5.35	3.35	3.85	4.80	3.66
	80	4.70	5.69	3.71	4.02	5.05	3.82
	90	5.85	6.74	4.37	6.10	5.92	5.47