Table 4. Correlation of altitude-dependent SpO₂ and NPD.

SpO2 vs	r	P value	df
Control
Basal NPD	−0.23	0.40	14
ENaC fraction	0.46	0.14	10
CFTR fraction	−0.60	0.15	5
AR NPD	−0.33	0.36	8
HAPE
Basal NPD	−0.15	0.59	13
ENaC fraction	0.66	0.01	13
CFTR fraction	−0.69	0.31	2
AR NPD	−0.43	0.13	2

See Table 3 for detailed description. Some values of SpO₂ are computed from altitude data by the linear regression of SpO₂ and altitude (see Table 3).