Table 3. Comparison of pre- and post-accessory muscles and lung capacities differences in the non-smokers group (n=10)

	Pre	Post	Difference	t	p
Sternocleidomastoid muscle (cm)	0.89±0.15	0.95±0.15	0.06±0.02	10.875	0.000*
Pectoralis minor muscle (cm)	0.92±0.17	1.00±0.15	0.08±0.04	5.821	0.000*
FVC (L)	4.45±0.33	4.42±0.41	0.02±0.16	0.424	0.682
FEV1 (L)	3.88±0.31	3.78±0.44	0.10±0.33	0.959	0.362

FVC, forced vital capacity; FEV1, forced expiratory volume in one second.
p<0.05.