Table 3.

Comparison of lung function ($\overline{\text{x}}$ ± s).

Groups	FEV1 (L)	FVC (L)	MVV (L/m)
Research group (n = 86)	3.25 ± 0.71	3.71 ± 0.58	55.84 ± 5.49
Control group (n = 87)	2.54 ± 0.82	3.12 ± 0.67	52.14 ± 5.03
t	6.085	6.189	4.623
P	<0.001	<0.001	<0.001