Table 2. Correlations of UIC, BMI, BSA and Tvol.

	N	Tvol	Spearman rho	P
Total	863	BSA	0.527	0.000
		BMI	0.348	0.000
		AGE	0.460	0.000
		UIC	0.03	0.385
Boys	414	BSA	0.518	0.000
		BMI	0.364	0.000
		AGE	0.456	0.000
		UIC	0.017	0.721
Girls	447	BSA	0.538	0.000
		BMI	0.347	0.000
		AGE	0.466	0.000
		UIC	0.043	0.382

Abbreviations: BMI, body mass index; BSA, body surface area; Tvol, thyroid volume; UIC, urinary iodine concentration.