Table 2.

Results of the statistical analysis

	n	Degrees of polynomial approximation
		1	2	3	4	5	6
VC versus CE	R	0.112	0.136	0.143	0.147	0.152	0.198
	r	0.335	0.369	0.379	0.384	0.391	0.445
	P	0.066	0.04	0.035	0.033	0.03	0.012
CE versus OS	R	0.019	0.046	0.059	0.089	0.110	0.110
	R	0.140	0.214	0.243	0.299	0.333	0.330
	P	0.434	0.230	0.172	0.090	0.058	0.058
DCE versus OS	R	0.0076	0.053	0.055	0.056	0.060	0.104
	R	0.087	0.231	0.236	0.237	0.245	0.323
	P	0.622	0.187	0.178	0.176	0.161	0.060
VC versus OS	R	0.023	0.056	0.070	0.110	0.151	0.168
	r	0.152	0.242	0.265	0.332	0.389	0.410
	P	0.355	0.137	0.102	0.004	0.014	0.010
DVC versus OS	R	0.017	0.023	0.024	0.037	0.104	0.105
	r	0.129	0.153	0.155	0.192	0.322	0.323
	P	0.430	0.352	0.345	0.241	0.050	0.040

Notes: n, degree of polynomial approximation; R, R² values; r, Pearson’s correlation coefficients; P, P-values.

Abbreviations: VC, vital capacity; CE, chest expansion; OS, oxygen saturation; DCE, deviation of the measured chest expansion from the normal values; DVC, deviation of the measured vital capacity from the normal values.