Table 2.

Comparison of the aerodynamic parameters between the two groups defined by the AN ratio 0.6

	Group 1 (n = 25)		Group 2 (n = 10)	Group 1 versus Group 2
	Mean	SD	Mean	SD	p value
Inspiration
ΔP	− 4.38	2.15	− 4.65	2.18	0.373a
Maximum Vms	2.36	0.46	3.04	0.80	0.013a
Maximum Pws	2.50	5.14	0.93	0.54	0.190b
Minimum Pw	− 11.18	5.09	− 13.14	6.97	0.115b
Expiration
ΔP	3.59	2.87	3.60	2.15	0.494a
Maximum Vms	2.22	0.94	2.92	1.20	0.045b
Maximum Pws	1.64	1.82	1.13	0.84	0.440b
Minimum Pw	− 11.67	4.97	− 13.67	5.87	0.157a

Group 1 consisted of the cases with AN ratio less than the 0.6 whereas Group 2 consisted of the cases with AN ratio equal or more than 0.6

^aIndependent samples T test (one-tailed)

^bMann–Whitney U test (one-tailed)