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Table 2 Numbers and percentage of excluded subjects by exclusion criteria and number of acceptable tests

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

Exclusion criteria and acceptable test N %
Curves with a sub-maximal expiratory effort 56 6.1
Only 1 acceptable manoeuvre 4 0.4
Early interruption 100 10.9
Expiration time < 0.5 sec 7 0.8
Total excluded subjects 149 16.3
Subjects with acceptable tests 766 83.7