Table 1.

The baseline characteristics in investigated areas.

	Total	Tuguegarao	Lagum	P value
	n = 158	n = 49	n = 109
Age (year)	8.6 ± 1.9	8.6 ± 1.9	8.6 ± 1.9	0.939
Weight (kg)	24.80 ± 7.59	29.67 ± 9.40	22.66 ± 5.44	0.000
Height (cm)	123.45 ± 11.97	128.04 ± 10.72	121.43 ± 11.97	0.001
BSA (m2)	0.92 ± 0.18	1.02 ± 0.20	0.87 ± 0.14	0.000
Thyroid size (mL)	2.60 ± 1.10	2.99 ± 1.34	2.42 ± 0.92	0.002