Table I.

Mean and Standard deviation of Demographic and Pulmonary function variables.

	Mean ± SD (n = 751)	Boys (n = 484)	Girls (n = 267)
Age	12.96 ± 2.8	13.1 ± 2.7	12.66 ± 2.8
Height (cm)	150.2 ± 15.8	152.3 ± 16.7	146.4 ± 13.3
Weight (Kg)	44.2 ± 16.6	45.3 ± 17.3	42.2 ± 15
BMI	19 ± 4.4	18.9 ± 4.3	19.2 ± 4.5
FVC	2.21 ± 0.75	2.28 ± 0.753	2.10 ± 0.74
FEV1	2.08 ± 0.73	2.13 ± 0.726	1.97 ± 0.73
FEV1/FVC	92.9 ± 4.7	92.93 ± 4.78	92.89 ± 4.49
PEF	231.3 ± 70.5	236.6 ± 73.59	221.6 ± 63.6
FEF25-75	2.68 ± 1.2	2.78 ± 1.26	2.52 ± 1.06