Skip to main content

Table 3 Repeatability within subject of lung function parameters expressed as within subjects variation coefficient (standard deviation within the two best/mean of the two best%)

From: Reference values of Forced Expiratory Volumes and pulmonary flows in 3–6 year children: a cross-sectional study

  FVCa FEV1 b FEV0.75 c FEV0.5 d MEF75 e MEF50 f MEF25 g
N 458 576 680 766 458 458 458
Mean (%) 2.0 2.2 2.2 2.1 6.0 9.1 16.3
Max (%) 12.4 13.6 13.7 14.1 51.9 51.9 92.3
0–5% (%) 90.8 90.8 92.1 90.9 65.0 41.1 23.9
6–10% (%) 8.1 8.5 7.5 8.4 19.4 33.5 20.2
10%+ (%) 1.1 0.7 0.4 0.8 15.6 25.3 56.0
  1. aFVC = forced vital capacity;
  2. bFEV1= forced expiratory volume in one second;
  3. cFEV0.75 = forced expiratory volume in 3/4 of a second;
  4. dFEV0.5 = forced expiratory volume in half a second;
  5. eMEF75 = instantaneous expiratory flow when 25% of FVC has to be expired
  6. fMEF50 = instantaneous expiratory flow when 50% of FVC has to be expired
  7. gMEF25 = instantaneous expiratory flow when 75% of FVC has to be expired