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Table 1 Demographic characteristics of the total and subgroup patients

From: Utility of the CAT in the therapy assessment of COPD exacerbations in China

Variable

Total group

Sub group

P value

 

(n = 78)

(n = 39)

 

Age, years

69.01 ± 10.39

67.90 ± 11.02

0.56a

Females, n (%)

34(43.58)

18(46.15)

0.78b

BMI, kg/m2

21.82 ± 4.02

21.06 ± 3.87

0.89a

Smoking status, %

   

  Current smoker

35.14

40.93

0.66b

  Ex-smoker

35.12

33.26

 

  Never smoked

29.74

25.81

 

Smoking index, pack-years

43.00 ± 26.00

41.00 ± 23.00

0.67a

Comorbidities, n (%)

33(49.25)

18(46.15)

0.69b

Exacerbation frequency

2.55 ± 1.44

2.58 ± 1.62

0.92a

Education, years

6.79 ± 5.17

6.51 ± 4.89

0.63a

PaO2, mm Hg

67.05 ± 18.90

67.80 ± 23.40

0.54a

PaCO2, mm Hg

44.48 ± 11.85

43.42 ± 15.08

0.31a

Pulmonary function at exacerbation

   

FEV1, % predicted

46.79 ± 19.14

45.37 ± 20.27

0.71a

FEV1, L

0.90 ± 0.33

0.82 ± 0.38

0.39a

FVC, L

1.57 ± 0.56

1.49 ± 0.57

0.44a

  1. Data are presented as mean ± standard deviation, except where indicated otherwise. Comorbidities included hypertension, diabetes mellitus, cerebral infarction, coronary artery disease, and these comorbidities were all in stable state which confirmed by physicians from related departments. BMI = Body Mass Index. at-test. bχ2 test.