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Table 1 Demographic characteristics of the patient population

From: Long-term effect of respiratory training for chronic obstructive pulmonary disease patients at an outpatient clinic: a randomised controlled trial

Characteristics

Control group (n = 30)

Intervention group (n = 30)

χ2 test* t test

P value

Age, year

73.0 ± 5.8

75.4 ± 6.6

0.60*

0.439

Female

7

8

0.09

0.764

Ex-smokers

22

24

0.37

0.543

Smoking index (pack year)

26.2 ± 4.6

25.3 ± 4.8

0.44*

0.562

Hypertension

14

12

0.27

0.603

Coronary artery disease

7

6

0.10

0.751

Stroke

4

4

0.14

0.708

Type 2 diabetes

3

4

0.001

0.974

Numbers of concomitant diseases

2.3 ± 0.7

2.2 ± 1.0

0.53*

0.467

Resting blood gas findings (FiO2 21 %)

 PaO2 <60 mmHg

3

2

0.001

0.467

 PaCO2 >45 mmHg

4

6

0.48

0.488

 PH <7.35

2

1

0.001

0.974

FVC (% of predicted)

65.3 ± 14.8

68.7 ± 15.5

1.05*

0.306

FEV1 (% of predicted)

43.33 ± 3.6

41.9 ± 2.6

0.616*

0.533

 50–80

3

5

0.14

0.708

 30–50

11

10

0.07

0.791

 ~30

16

15

0.07

0.791

  1. FVC forced vital capacity, FEV1 forced expiratory volume in one-second