Table 1. Normal thyroid volume by age and gender .

-	n	Thyroid volume (mL) 0.-2. day	Thyroid volume (mL) 15.-30. day	p
Girls	71	0.64±0.26	1.12±0.33	<0.01
Boys	73	0.68±0.23	1.13±0.33	<0.01
Total	144	0.66±0.25	1.12±0.33	<0.01

mL: milliliters