Defining and grading an obstructive ventilatory defect (OVD): ‘FEV₁/FVC lower limit of normal (LLN) vs. Z-score’ and ‘FEV₁ percentage predicted (%pred) vs. Z-score’

Rim KammounDepartment of Physiology and Functional Explorations, Farhat HACHED Hospital, Sousse, TunisiaView further author information

Ines GhannouchiDepartment of Physiology and Functional Explorations, Farhat HACHED Hospital, Sousse, Tunisia;Laboratory of Physiology, Faculty of Medicine of Sousse, University of Sousse, Sousse, TunisiaView further author information

Sonia RouatbiDepartment of Physiology and Functional Explorations, Farhat HACHED Hospital, Sousse, Tunisia;Heart Failure (LR12SP09) Research Laboratory, Farhat Hached Hospital, Sousse, Tunisia

http://orcid.org/0000-0003-3411-1182 View further author information

Helmi Ben SaadDepartment of Physiology and Functional Explorations, Farhat HACHED Hospital, Sousse, Tunisia;International Center of Functional Explorations, Sousse, TunisiaCorrespondence[email protected]

http://orcid.org/0000-0002-7477-2965 View further author information

Defining and grading an obstructive ventilatory defect (OVD): ‘FEV₁/FVC lower limit of normal (LLN) vs. Z-score’ and ‘FEV₁ percentage predicted (%pred) vs. Z-score’

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Defining and grading an obstructive ventilatory defect (OVD): ‘FEV1/FVC lower limit of normal (LLN) vs. Z-score’ and ‘FEV1 percentage predicted (%pred) vs. Z-score’

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Defining and grading an obstructive ventilatory defect (OVD): ‘FEV₁/FVC lower limit of normal (LLN) vs. Z-score’ and ‘FEV₁ percentage predicted (%pred) vs. Z-score’