Table 4. Median (50th percentile (P50)) and 97th percentile (p97) values for thyroid volume measured by ultrasound according to sex and age of children aged 6–12 years in Zhejiang province, China.

		Boys		Girls
Age (y)	n (a/b)	p50 (a/b), ml	p97 (a/b)	p50 (a/b), ml	p97 (a/b)
6	468/108	1.6/2.12	2.91/2.55	1.57/2.25	2.84/3.23
7	561/136	1.8/2.66	3.29/3.06	1.81/2.74	3.26/3.25
8	579/141	2.03/3.03	3.71/3.85	2.08/2.68	3.76/3.65
9	588/159	2.3/3.15	4.19/3.83	2.4/3.00	4.32/3.80
10	528/144	2.59/3.45	4.73/4.86	2.76/3.80	4.98/5.07
11	492/154	2.92/3.93	5.34/4.75	3.17/4.08	5.73/5.20
12	313/133	3.3/3.98	6.03/5.85	3.65/4.39	6.59/5.50