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Table 1 Characteristics of the study population

From: Is generalization of exhaled CO assessment in primary care helpful for early diagnosis of COPD?

Variable

All

Without eCO assessment

With eCO assessment

P-value

(n = 410)

(n = 194)

(n = 216)

Female (%)

216 (53.3)

103 (53.9)

113 (52.8)

.875c

Age (years)

60.6 ± 16.2

61.8 ± 15.8

59.5 ± 16.5

.144t

Smoking status

   

.095c

Current smokers (%)

96 (23.4)

37 (19.1)

59 (27.3)

 

Former smokers (%)

130 (31.7)

61 (31.4)

69 (31.9)

 

Never smokers (%)

184 (44.9)

96 (49.5)

88 (40.7)

 

Pack-years

22.4 ± 15.9

22.4 ± 16.6

22.3 ± 15.6

.918m

Exhaled CO (ppm)

3.88 ± 7.01

NA

3.88 ± 7.01

NA

  1. (t) Student t-test, (m) Mann-Whitney rank sum test, (c) Pearson’s Chi-squared test.
  2. Categorical data are defined in number and percentage. Continuous data are expressed as mean and standard deviation. Comparisons were made between patients who ended up with an exhaled CO measurement and patients without measurement.