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Table 1 Demographics, smoking habit, presence of comorbid disorders and chronic treatment other than that for COPD according to final COPD diagnosis (N = 227)

From: Diagnostic accuracy of a pocket screening spirometer in diagnosing chronic obstructive pulmonary disease in general practice: a cross sectional validation study using tertiary care as a reference

Variables All (N = 227) COPD (n = 43) Non-COPD (n = 184) Statistics
Women (%) 115 (50.7) 17 (39.5) 99 (53.2) χ2 = 2.711, P = 0.100
Age (years), mean ± SD 52.5 ± 6.8 53.6 ± 7.0 52.3 ± 6.7 t = 1.139, P = 0.256
BMI (kgm−2), mean ± SD 26.5 ± 4.2 26.5 ± 5.2 26.5 ± 3.9 t = 0.100, P = 0.921
Active smokers (%) 185 (84.9) 32 (84.2) 153 (85.0) χ2 = 0.015, P = 0.902
Years of smoking, mean ± SD 30.6 ± 6.9 32.0 ± 6.4 30.3 ± 6.9 z = 1.641, P = 0.101
Cigarettes/day, mean ± SD 24.6 ± 9.1 24.4 ± 8.0 24.6 ± 9.2 z = 0.241, p = 0.809
Pack-years, mean ± SD 37.9 ± 17.4 39.1 ± 14.3 37.5 ± 17.5 z = 1.310, p = 0.190
Presence of comorbid disorders (%) 126 (55.5) 22 (51.2) 104 (56.5) χ2 = 0.049, P = 0.825
Chronic treatment (%) 99 (43.6) 16 (37.2) 83 (45.1) χ2 = 0.125, P = 0.724
  1. χ2 chi-square test results, t result of Student’s t-test, z result of Mann-Whitney U test, SD standard deviation, BMI body mass index calculated as the ratio of body weight in kg and squared body height in meters