Mild quitter (n = 258)

Moderate quitter (n = 36)

Heavy quitter (n = 12)

p value

Predicted FEV1

3.36 ± 0.14

3.20 ± 0.09

2.90 ± 0.00

0.015

Actual FEV1

3.23 ± 0.52

1.93 ± 0.18

1.58 ± 0.00

0.006

Functional defect of FEV1

0.81 ± 1.00

1.27 ± 0.19

1.32 ± 0.00

0.008

Predicted FVC

4.20 ± 0.19

4.11 ± 0.53

3.52 ± 0.00

0.125

Actual FVC

3.74 ± 0.57

2.82 ± 0.32

2.64 ± 0.00

0.025

Functional defect of FVC

0.67 ± 0.32

1.08 ± 0.29

0.88 ± 0.00

0.241

Predicted FEV1/FVC

79.79 ± 3.66

78.00 ± 7.75

82.00 ± 0.00

0.231

Actual FEV1/FVC

86.19 ± 6.72

67.67 ± 3.14

60.00 ± 0.00

0.352

Functional defect of FEV1/FVC

0.08 ± 0.03

0.11 ± 0.05

0.22 ± 0.00

0.452

Predicted PEFR

9.89 ± 0.47

9.56 ± 0.46

8.15 ± 0.00

0.235

Actual PEFR

7.92 ± 2.09

3.12 ± 0.91

2.60 ± 0.00

0.041

FFD of PEFR

2.41 ± 1.72

6.44 ± 0.64

5.55 ± 0.00

0.052

Predicted TLC

5.30 ± 0.22

4.84 ± 1.20

4.40 ± 0.00

0.325

Actual TLC

4.71 ± 0.68

3.81 ± 0.48

3.30 ± 0.00

0.365

FFD of TLC

0.83 ± 0.41

2.02 ± 0.14

1.10 ± 0.00

0.918

CO exhaled level

1.58 ± 0.88

1.50 ± 0.55

1.00 ± 0.00

0.852

SpO2

96.72 ± 1.03

96.83 ± 0.41

94.00 ± 0.00

0.933