Skip to main content

Table 4 Description of lung function, sensitisation and health-care utilisation

From: Frequent cough in unsatisfactory controlled asthma – results from the population-based West Sweden Asthma Study

Variables No Current asthma No Controls P values
Overall number of subjects 744   847   
FEV1% predicted 707 90.6 ± 17.6 816 101.0 ± 12.9 <0.001
FEV1% predicted below 80% 707 164 (23.2) 816 43 (5.3) <0.001
Positive reversibility after a bronchodilator 444 110 (24.8) 465 16 (3.4) <0.001
FEV1/FVC ratio < 0.7 705 96 (13.6) 817 33 (4.0) <0.001
FeNO ppb# 597 26.88 ± 24.3 676 19.03 ± 11.0 <0.001
Reactiveness to PD20 ≤ 1.96 mg** 275 195 (70.9) 328 105 (32.0) <0.001
At least 1 positive SPT 575 413 (71.8) 577 191 (33.1) <0.001
Number of positive SPT in the sensitised subjects 413   191   
    1   79 (19.1)   68 (35.6) <0.001*
    2   63 (15.3)   54 (28.3)
    3   75 (18.2)   29 (15.2)
    ≥4   196 (47.4)   40 (20.9)
Doctor's office visits 740 263 (35.3) 844 80 (9.5) <0.001
Hospitalisations 735 16 (2.2) 844 1 (0.1) <0.001
Emergency visits due to respiratory problems 733 78 (10.6) 842 11 (1.3) <0.001
  1. Comparisons of FEV1/FVC ratio, PD20 reactiveness, positive reversibility after a bronchodilator and BMI are done using Chi-square test, other clinical parameters are compared using unpaired t-test. *p-value from the test for trend.
  2. #measured at 50 ml/s.
  3. **% of subjects reacted to methacholine dose ≤ of 1.96 mg with 20% fall in the FEV1.
  4. Data are presented as number of subjects No (%) or mean ± SD.