Table 6: Overnight oximetry test result – associations with pulmonary function tests

Variable Normal (N=54) Low baseline oxygen (N=23) Abnormal (N=17) P-value
Oxygen saturation level (%) 96 (95–97) 94 (92–96) 95 (93–96) < 0.001
Partial pressure of oxygen in arterial blood (%) 72 (65–79) 64 (58–67) 66 (58–73) 0.021
Percent predicted total lung capacity (%) 88 (76–101) 80 (67–96) 80 (66–90) 0.019
Percent predicted FEV1 (%) 68 (55–79) 67 (45–75) 66 (50–86) 0.56
FEV1/FVC 73 (66–77) 74 (67–83) 79 (74–84) 0.030
Percent predicted DLCO (%) 67 (57–81) 55 (45–72) 56 (37–72) 0.045
- P-values result from Kendall’s correlation coefficient tau or a Cochran-Armitage trend test.