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Table 1 Characteristics of the study population. Values are number (proportion) or mean (SD); OAD = obstructive airway disease; COPD = Chronic obstructive airway disease (n = 219)

From: Diagnostic accuracy of spirometry in primary care

  Overall
n (%)
Asthma
n (%)
COPD
n (%)
No OAD
n (%)
n 219 (100) 90 (100) 50 (100) 79 (100)
Female 127 (57.7) 55 (61.1) 26 (54.1) 46 (58.2)
Obesity 30 (13.7) 8 (8.9) 10 (20.0) 12 (15.2)
Age (mean in years [sd]) 43.8 [15.6] 37.9 [14.4] 56.9 [11.5] 42.1 [14.4]
Do you sometimes suffer from shortness of breath? (yes) 135 (61.4) 55 (61.1) 39 (76.3) 41 (51.9)
Have you suffered from wheezing in your chest? (yes) 108 (49.1) 47 (52.2) 30 (63.2) 30 (38.0)
Do you often suffer from a cough? (yes) 126 (57.3) 39 (43.3) 32 (65.8) 55 (69.6)
Do you often suffer from expectoration? (yes) 74 (33.6) 22 (24.4) 20 (36.8) 32 (40.5)
Have you been woken up with a feeling of tightness in your chest? (yes) 49 (22.3) 27 (30.0) 9 (10.5) 13 (16.5)
Have you been woken up by an attack of shortness of breath? (yes) 48 (21.8) 24 (26.7) 10 (18.4) 14 (17.7)
Have you suffered an asthma attack? (yes) 14 (6.4) 11 (12.2) 2 (2.6) 1 (1.3)
Do you suffer from any nasal allergies? (yes) 92 (41.8) 44 (48.9) 14 (31.6) 34 (43.0)
Do you often suffer from a common cold? (yes) 73 (33.2) 18 (20.0) 18 (26.3) 37 (46.8)
Do you smoke or did you smoke? (yes) 118 (53.4) 35 (38.9) 43 (86.8) 39 (49.4)
How much do/did you smoke? (mean in pack year [SD]) 11.6 [17.7] 6.6 [12.9] 28.8 [21.7] 6.4 [11.9]