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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