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Table 1 Baseline characteristics of the study participants

From: Role of PM2.5 in the development and progression of COPD and its mechanisms

 

Urban (Wuhan)

Rural (Haokou)

P-value

No. subjects

1372

1843

 

<40y, No. subjects/Total(%)

191/1372 (13.9)

226/1843 (12.3)

 

≥40y, No. subjects/Total(%)

1181/1372 (86.1)

1617/1843 (87.7)

0.17

Gender

 Male, n/T(%)

1013/1372 (73.8)

1294/1843 (79.2)

 

 Female, n/T(%)

359/1372 (26.2)

549/1843 (20.8)

0.02

Smoking status

 Smoking(>0), n/T (%)

352/1372 (25.7)

1097/1843 (59.5)

 

 Never smoking (=0), n/T (%)

1020/1372 (74.3)

746/1843 (40.5)

< 0.001

 Smoking(≥10), n/T (%)

259/1372 (18.9)

1000/1843 (54.3)

 

 Smoking(<10), n/T (%)

1113/1372 (81.1)

843/1843 (45.7)

< 0.001

Smoking amount, pack-year (mean ± SD)

 Total

6.2 ± 15.1

20.8 ± 27.6

< 0.001

 Smoking(>0)

24.3 ± 21.3

35.1 ± 28.1

< 0.001

 Never smoking(=0)

0

0

Not Applicable

 Smoking(≥10)

31.4 ± 20.6

38.0 ± 27.7

< 0.001

 Smoking(<10)

0.4 ± 1.5

0.5 ± 1.8

0.18

Lung function

   Total, n/T (%)

1372/1372 (100)

1843/1843 (100)

 

  FVC, ml (mean ± SD)

3.37 ± 0.83

3.40 ± 0.82

0.31

 FEV1, ml (mean ± SD)

2.73 ± 0.71

2.68 ± 0.76

0.057

 FEV1/FVC, % (mean ± SD)

81.22 ± 8.10

78.31 ± 10.45

< 0.001

 Smoking(>0), n/T (%)

352/1372 (25.7)

1097/1843 (59.5)

 

 FVC, ml (mean ± SD)

3.97 ± 0.73

3.51 ± 0.84

< 0.001

 FEV1, ml (mean ± SD)

3.08 ± 0.69

2.68 ± 0.81

< 0.001

 FEV1/FVC, % (mean ± SD)

77.55 ± 9.80

75.33 ± 11.18

< 0.001

 Never smoking (=0), n/T (%)

1020/1372 (74.3)

746/1843 (40.5)

 

 FVC, ml (mean ± SD)

3.17 ± 0.76

3.23 ± 0.77

0.1

 FEV1, ml (mean ± SD)

2.61 ± 0.68

2.68 ± 0.68

0.03

 FEV1/FVC, % (mean ± SD)

82.49 ± 6.99

82.71 ± 7.32

0.52

 Smoking(≥10), n/T (%)

259/1372 (18.9)

1000/1843 (54.3)

 

 FVC, ml (mean ± SD)

3.89 ± 0.69

3.48 ± 0.83

< 0.001

 FEV1, ml (mean ± SD)

2.95 ± 0.63

2.64 ± 0.80

< 0.001

 FEV1/FVC, % (mean ± SD)

75.74 ± 10.18

74.85 ± 11.13

0.24

 Smoking(<10), n/T (%)

1113/1372 (81.1)

843/1843 (45.7)

 

 FVC, ml (mean ± SD)

3.25 ± 0.81

3.30 ± 0.81

0.18

 FEV1, ml (mean ± SD)

2.68 ± 0.72

2.73 ± 0.70

0.12

 FEV1/FVC, % (mean ± SD)

82.50 ± 6.94

82.42 ± 7.80

0.81

COPD morbidity

 Total, n/T (%)

92/1372 (6.7)

229/1834 (12.5)

< 0.001

 Smoking(>0), n/T (%)

52/352 (14.8)

208/1097 (19.0)

0.075

 Never smoking (=0), n/T (%)

40/1020 (3.9)

21/746 (2.8)

0.21

 Smoking(≥10), n/T (%)

49/259 (18.9)

203/1000 (20.3)

0.62

 Smoking(<10), n/T (%) mm

43/1113 (3.9)

26/843 (3.1)

0.36