. 2016 Aug 4;6:30780. doi: 10.1038/srep30780

Table 3. Correlations between altitude, SpO₂, and NPD level were analyzed with the Pearson’s product-moment correlation (r) of the software R.

Altitude vs	r	P value	df
Control
Basal NPD	0.28	0.43	8
ENaC fraction	−0.46	0.18	8
CFTR fraction	0.7	0.08	5
AR NPD	0.37	0.37	6
HAPE
Basal NPD	−0.06	0.83	12
ENaC fraction	−0.65	0.01	12
CFTR fraction	0.74	0.26	2
AR NPD	0.2	0.51	11

The linear regression of SpO₂ and altitude is, SpO₂ = 98.94−0.006 × altitude. The normal SpO₂ value of healthy persons at the sea level is 98.94%. df, degree of freedom.

Table 3. Correlations between altitude, SpO2, and NPD level were analyzed with the Pearson’s product-moment correlation (r) of the software R.

Table 3. Correlations between altitude, SpO₂, and NPD level were analyzed with the Pearson’s product-moment correlation (r) of the software R.