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Table 7 Mean and 5th percentile as limit of normal value in asymptomatic subjects

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

Parameter N Mean 5thntil
FEV1/FVC 285 0.96 0.88
FEV0.75/FVC 311 0.92 0.83
FEV0.5/FVC 327 0.81 0.69
  1. FEV1/FVC = ratio of forced expiratory volume in one second and forced vital capacity;
  2. FEV0.75/FVC = ratio of forced expiratory volume in 3/4 of a second and forced vital capacity;
  3. FEV0.5/FVC = ratio of forced expiratory volume in half a second and forced vital capacity;