Table 3. Correlation between anthropometric indices and lung function in boys.

Variables	Period 1					Period 2
	Correlation coefficient with FVC	P value	Correlation coefficient with FEV1	P value		Correlation coefficient with FVC	P value	Correlation coefficient with FEV1	P value
Age, years	0.751	<0.001	0.739	<0.001		0.444	<0.001	0.479	<0.001
Weight, kg	0.826	<0.001	0.810	<0.001		0.588	<0.001	0.589	<0.001
Height, cm	0.888	<0.001	0.864	<0.001		0.669	<0.001	0.700	<0.001
BMI, kg/m2	0.469	<0.001	0.472	<0.001		0.365	<0.001	0.345	<0.001

BMI, body mass index; FVC, forced vital capacity; FEV₁, forced expiratory volume in the first second.