Table 2. Comparison of pre-test and post-test pulmonary variable mean values within and between the control and intervention groups .

Pulmonary Variables	Control group			Intervention group
	Before	After	Within	Before	After	Within	Between
	Mean (SD)	Mean (SD)	P value	Mean (SD)	Mean (SD)	P value	P value
Forced Vital Capacity (l)	1.72 (0.73)	1.66 (0.67)	0.302	1.99 (0.75)	2.70 (0.65)	0.001	0.001
Forced Expiratory Flow in one sec (l)	1.23 (0.52)	1.20 (0.53)	0.501	1.32 (0.65)	1.98 (0.55)	0.001	0.001
Peak Expiratory Flow (l/min)	1.47 (0.68)	1.58 (0.74)	0.841	1.70 (1.08)	2.53 (0.79)	0.001	0.001
Respiratory Rate (breaths/min)	19.13 (2.02)	19.83 (2.04)	0.833	19.44 (2.67)	19.06 (1.66)	0.670	0.490