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Table 4 Correlation between prognostic markers of COPD exacerbations (spirometry, CAT and SpO2)

From: How stable is lung function in patients with stable chronic obstructive pulmonary disease when monitored using a telehealth system? A longitudinal and home-based study

SubjectFEV1 vs ICIC vs CATFEV1 vs CATIC vs SpO2FEV1 vs SpO2
10.48−0.04−0.140.220.20
20.90−0.15−0.200.140.15
30.45−0.06−0.010.030.04
40.60−0.19−0.18−0.010.07
50.660.030.08− 0.160.07
60.44−0.16− 0.19− 0.010.10
7−0.03− 0.130.13− 0.190.09
80.42−0.350.120.200.31
90.53−0.47− 0.41−0.03− 0.06
100.58−0.42−0.15− 0.03−0.28
110.29−0.580.180.21−0.08
Median (IQR)0.48 (0.17)−0.16 (0.32)−0.14 (0.30)− 0.01 (0.22)0.07 (0.17)
  1. Values are correlation coefficients. FEV1 Forced Expiratory Volume in one second, IC Inspiratory Capacity, CAT COPD Assessment Test, SpO2 Oxygen saturation measured by pulse oximetry, IQR Inter Quartile Range