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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

Subject

FEV1 vs IC

IC vs CAT

FEV1 vs CAT

IC vs SpO2

FEV1 vs SpO2

1

0.48

−0.04

−0.14

0.22

0.20

2

0.90

−0.15

−0.20

0.14

0.15

3

0.45

−0.06

−0.01

0.03

0.04

4

0.60

−0.19

−0.18

−0.01

0.07

5

0.66

0.03

0.08

− 0.16

0.07

6

0.44

−0.16

− 0.19

− 0.01

0.10

7

−0.03

− 0.13

0.13

− 0.19

0.09

8

0.42

−0.35

0.12

0.20

0.31

9

0.53

−0.47

− 0.41

−0.03

− 0.06

10

0.58

−0.42

−0.15

− 0.03

−0.28

11

0.29

−0.58

0.18

0.21

−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
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BMC Medical Informatics and Decision Making

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