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Table 2 Patient's characteristics

From: Analysis of nitrogen oxides (NOx) in the exhaled breath condensate (EBC) of subjects with asthma as a complement to exhaled nitric oxide (FeNO) measurements: a cross-sectional study

  Asthma (n = 23) Controls (n = 23) Statistics1
Age (years) a 50.0 [30.0 - 56.0] 46 [28.0 - 51.0] 0.534
Height (meter) a 1.65 [1.62 - 1.75] 1.68 [1.62 - 1.75] 0.767
Weight (kg) a 73.0 [63.0 - 84.0] 70.0 [61.0 - 75.0] 0.347
BMI (kg/m2) a 26.5 [22.5 - 27.7] 23.4 [21.7 - 26.1] 0.173
Male b 12 (52.2) 7 (30.4) 0.134
Smoking b    1.0
   Ex-smoker 4 (17.4) 4 (17.4)  
   Smoker 6 (26.1) 6 (26.1)  
   Non-smoker 13 (56.5) 13 (56.5)  
TLC (obs/pred) a,c 106.4 [100.6 - 116.0] 108.6 [100.2 - 112.6] 0.859
SVC (obs/pred) a,c 90.5 [81.0 - 95.4] 106.6 [100.4 - 119.2] < 0.001
FEV1 (obs/pred) a,c 56.5 [50.3 - 73.7] 107.1 [100.8 - 115.6] < 0.001
FEV1/SVC (obs/pred) a,c 69.4 [57.2 - 77.9] 102.8 [96.7 - 105.9] < 0.001
MMEF (obs/pred) a,c 23.4 [14.5 - 38.5] 95.7 [79.2 - 107.6] < 0.001
TLCO (obs/pred) a,c 78.5 [68.5 - 94.0] 90.0 [81.0 - 103.5] 0.102
Total expired volume (L) a 204 [200 - 250] 205 [200 - 225] 0.6292
Total volume of EBC (mL) a 4.00 [3.50 - 5.00] 4.00 [3.75 - 4.50] 0.7872
Time (min) a 20 [16 - 25] 20 [18 - 24] 0.9112
  1. BMI: body mass index, TLC: total lung capacity, SVC: slow vital capacity, FEV1: forced expiratory volume in 1s, MMEF: Maximum mid-expiratory flow, TLCO: carbon monoxide gas transfer
  2. a data expressed as median [IQR]
  3. b data expressed as n (%)
  4. c data expressed as % of predicted values
  5. 1 p(Chi-2)
  6. 2 ANOVA on the ranks