Table 4.

Coefficient of correlation of different parameters with age, height and weight

	Age		Height		Weight
	r value	P value	r value	P value	r value	P value
TV(I)	0.714	<0.01	0.773	<0.01	0.747	<0.01
IRV(I)	0.069	<0.10*	0.073	<0.10*	0.070	<0.10*
FVC(I)	0.828	<0.01	0.910	<0.01	0.864	<0.01
FEV 1 (I)	0.808	<0.01	0.887	<0.01	0.840	<0.01
FEV 3 (I)	0.121	<0.05	0.112	<0.05	0.083	<0.05
PEFR (l/min)	0.667	<0.01	0.727	<0.01	0.679	<0.01
FEF 25% (l/sec)	0.632	<0.01	0.694	<0.01	0.652	<0.01
FEF 50% (l/sec)	0.607	<0.01	0.669	<0.01	0.651	<0.01
FEF 75% (l/sec)	0.497	<0.01	0.543	<0.01	0.510	<0.01
MVV (l/min)	0.738	<0.01	0.815	<0.01	0.774	<0.01

^*Non significant

All the lung function parameters significantly correlated with age, height and weight except IRV

TV: Tidal Volume; IRV: Inspiratory reserve volume; FVC: Forced vital capacity;

FEV1: Timed vital capacity 1 second; FEV3: Timed vital capacity 3 second;

FEF: Forced Expiratory Flow; MVV: Maximum voluntary ventilation; PEFR: Peak expiratory flow rate