Comparison of the Diagnostic Performance of Five Clinical Questionnaires for Chronic Obstructive Pulmonary Disease
Table 1
General characteristics of the population.
Total population n = 681
COPD n = 187
No COPD n = 494
value
Age in years, mean (SD)
65.9 (11.8)
70.8 (11.1)
64 (11.5)
<0.001
Males, n (%)
315 (46.3)
114 (61)
201 (40.7)
<0.001
Academic training in years, mean (SD)
8.2 (5.6)
6.8 (5.5)
8.7 (5.6)
<0.001
Age at onset of symptoms, mean (SD)
57.9 (16.2)
59.4 (18.1)
57.3 (15.3)
0.180
Dyspnea, n (%)
437 (64.2)
135 (72.2)
302 (61.1)
0.007
Cough and expectoration, n (%)
287 (42.1)
92 (49.2)
195 (39.5)
<0.001
Wheezing, n (%)
216 (31.7)
76 (40.6)
140 (28.3)
0.002
Smoking history, n (%)
304 (44.6)
93 (49.7)
211 (42.7)
0.100
IPA, mean (SD)
15.7 (26.1)
19.4 (27.6)
14.2 (25.3)
0.122
Passive smoker, n (%)
145 (21.3)
36 (19.3)
109 (22.1)
0.423
Passive smoker years of exposure, mean (SD)
26.2 (17.1)
21.4 (14.5)
27.8 (17.6)
0.055
Exposure to wood smoke, n (%)
397 (58.3)
129 (69)
268 (54.3)
0.001
Wood smoke years of exposure, mean (SD)
24.5 (19.6)
26.2 (21.3)
23.7 (18.7)
0.269
Prior diagnosis of COPD, n (%)
209 (30.7)
94 (50.3)
115 (23.3)
<0.001
COPD: chronic obstructive pulmonary disease, SD: standard deviation, and IPA: index package/year. The p value prior diagnosis of COPD, n (%) in Table 1 is <0.001. The significance level of the bold values is <0.05.
