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Table 2 Comparison of clinical characteristics between pneumoconiosis patients with and without COPD

From: Prevalence and characteristics of COPD among pneumoconiosis patients at an occupational disease prevention institute: a cross-sectional study

Characteristics

Non-COPD (n = 519)

COPD (n = 119)

P Value

 

N

%

N

%

 

Pneumoconiosis category

 I

323

62.24

29

24.37

0.00 a,**

 II

114

21.97

18

15.13

 III

82

15.80

72

60.50

Exposure type

 Silicosis

113

21.77

29

24.37

0.54 a

 Coal

406

78.23

90

75.63

Engaged in Air drill

 Yes

264

50.87

74

62.18

0.03 a,*

 No

255

49.13

45

37.82

 Age,y

49.00(46.00,53.00)

53.00(48.00,60.00)

0.00 b,**

 BMI, kg/m2

23.14(21.30,25.22)

22.32(20.10,24.37)

0.01 b,**

 Exposure time, y

15.00 (10.00,25.00)

20.00(13.00,25.00)

0.01 b,*

 Smoking index

12.50(0.00,27.00)

20.00(1.25,32.00)

0.02 b,*

 Education

2.00(1.00,2.00)

2.00(1.00,2.00)

0.25

 Category

1.00(1.00,2.00)

3.00(2.00,3.00)

0.00 b,**

Pulmonary function

 Airflow limitation

0.00(0.00,0.00)

2.00(2.00,3.00)

0.00 b,**

 Pre-FEV1

89.70(81.40,98.60)

57.90(41.60,70.60)

0.00 b,**

 Pre-FVC

91.30(83.30,99.40)

76.80(65.40,87.20)

0.00 b,**

 FEV1/FVC

80.56(75.94,84.55)

62.19(51.84,65.63)

0.00 b,**

 DLCO

8.29(7.13,9.44)

6.86(5.42,7.99)

0.00 b,**

 DLCO%

91.90(79.20,104.50)

76.40(60.60,88.50)

0.00 b,**

Severity scores

 Cough

1.00(1.00,3.00)

2.00(1.00,3.00)

0.37

 Sputum

1.00(1.00,3.00)

2.00(1.00,3.00)

0.39

 Wheeze

0.00(0.00,0.00)

0.00(0.00,1.00)

0.00 b,**

 Dyspnea

2.00(2.00,2.00)

2.00(2.00,2.00)

0.00 b,**

 Chest tightness

2.00(1.00,3.00)

2.00(1.00,3.00)

0.29

 CAT

10.00(7.00,14.00)

13.00(8.00,17.00)

0.00 b,**

 CCQ

21.00(16.00,26.00)

25.00(21.00,29.00)

0.00 b,**

  1. Note: Airflow limitation are presented as average rating, 1 = mild, 2 = moderate, 3 = severe, 4 = very severe
  2. *p<0.05, **p<0.01
  3. aChi-square test
  4. bMann-Whitney U test