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Table 5 Distribution (mean and standard deviation) of lung function parameter by symptom status

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

  Asymptomatic Symptomatic Total
  N m (sd) § N m (sd) § N m (sd) §
FVC (lt)a 327 1.10(0.22) 128 1.07(0.24) 455 1.09(0.23)
FEV1 (lt)b 409 1.09(0.20) 169 1.05(0.21) 578 1.08(0.21)
FEV0.75(lt)d 493 1.04(0.19) 190 0.98(0.19) 683 1.02(0.19)
FEV0.5 (lt)c 562 0.90(0.16) 205 0.86(0.16) 767 0.89(0.16)
FEV1/FVC 285 0.96(0.04) 116 0.96(0.04) 401 0.96(0.04)
FEV0.75/FVC 311 0.92(0.05) 123 0.91(0.07) 434 0.92(0.06)
FEV 0.5/FVC 327 0.81(0.07) 128 0.80(0.09) 455 0.81(0.08)
MEF75(lt/s)e 327 2.32(0.50) 128 2.18(0.53) 455 2.28(0.51)
MEF50(lt/s)f 327 1.66(0.38) 128 1.57(0.40) 455 1.64(0.39)
MEF25(lt/s)g 327 0.85(0.24) 128 0.82(0.28) 455 0.84(0.25)
  1. §m(sd) = mean (standard deviation)
  2. aFVC = forced vital capacity;
  3. bFEV1= forced expiratory volume in one second;
  4. cFEV0.75 = forced expiratory volume in 3/4 of a second;
  5. dFEV0.5 = forced expiratory volume in half a second;
  6. eMEF75 = instantaneous expiratory flow when 25% of FVC has to be expired
  7. fMEF50 = instantaneous expiratory flow when 50% of FVC has to be expired
  8. gMEF25 = instantaneous expiratory flow when 75% of FVC has to be expired