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Table 1 Baseline characteristics of the enrolled patients

From: The minimal important difference of the pulmonary functional status and dyspnea questionnaire in patients with severe chronic obstructive pulmonary disease

Variables

Mean ± SD

Test-retest analyses

 

n = 301

n = 20

Gender (male/female)

241/60

15/5

Age (yrs)

65 ± 7

68 ± 6

BMI (kg/m 2 )

25 ± 5

27 ± 6

FEV 1 (% pred)

42 ± 15

52 ± 11

FEV 1 /FVC (%)

39 ± 10

42 ± 9

GOLD stage (I/II/III/IV)

2/20/56/22

0/35/60/5

FRC (% pred)

156 ± 36

164 ± 37

TLC (% pred)

113 ± 18

124 ± 25

TL, CO (% pred)

47 ± 16

27 ± 6

PImax (% pred)

77 ± 26

75 ± 12

VO 2 max (ml/kg/min)

14 ± 6

14 ± 4

W max (% pred)

64 ± 25

78 ± 20

6MWD (m)

396 ± 124

510 ± 85

PFSDQ-M activity (points)

47 ± 17

29 ± 18

PFSDQ-M dyspnea (points)

48 ± 17

28 ± 20

PFSDQ-M fatigue (points)

42 ± 19

24 ± 20

  1. SD standard deviation, BMI body mass index, FEV 1 forced expiratory volume in one second, FVC forced vital capacity, GOLD Global Initiative on Obstructive Lung Disease, FRC functional residual capacity, TLC total lung capacity, TL CO transfer factor of carbon monoxide, PImax maximum inspiratory pressure, 6MWD, six minute walking distance, PFSDQ-M pulmonary functional status and dyspnea questionnaire modified version.