Table 3 VRI image characteristics in AECOPD patients before NPPV treatment and after NPPV treatment

3.08 ± 0.92

7.75 ± 1.65

4.21 ± 1.25

2.41 ± 1.12

0.79 ± 0.29

18.13 ± 3.67

0.34 ± 37.44

2.75 ± 1.15

5.83 ± 2.39

2.88 ± 1.59

1.46 ± 0.67

0.83 ± 0.31

13.16 ± 3.67

4.11 ± 32.61

2.78 ± 0.51

6.51 ± 0.58

4.25 ± 0.85

1.75 ± 0.51

0.75 ± 0.31

15.25 ± 1.26

2.89 ± 35.45

1.39

5.64

5.76

5.98

0.29

6.18

4.33

0.26

<0.01 ^{a, b c}

<0.01 ^a,b

<0.01 ^a,b,c

0.75

<0.01 ^a,b,c

0.02 ^{a, b}