Appendix C: Predicted Normals - NDD EasyOne-CS Manuel De L'utilisateur

2030434-002 Rev. B

19 Appendix C: Predicted Normals

This document describes in detail which predicted normals are implemented in the current version of
EasyOne and the PC companion software EasyWare. The following table shows implementation details
and the publications on which the reference values are based.
The first table has the following entries:
Reference: Name of predicted normal reference used in EasyOne and EasyWare. The name is the study
name, or the name of the authors of the publication.
Publ. Year: Year when the study was published.
Abbrev.: Abbreviation for the study. The abbreviation is used if parameters from other studies are cop-
ied. Example: For most studies 'Cherniak' (CH) values are used for the MVV parameter.
Age Range: Age range of the study. If range was extended beyond the study range the extended range is
shown in parenthesis.
Height Range: Height range of the study. Extended range also listed in parenthesis, as in age range.
Weight Range: Weight range of the study. In most studies weight is not used.
Built in: The studies that are marked with an X are integrated into all EasyOne. Studies that are not
marked can be loaded into EasyOne by ndd or a local dealer.
Ethnic: Ethnic group that is supported by the study.
Parameter: In the parameter list the following indicators are used:
X
X (green)
X (orange)
FVC, IVC
FEV1/FVC
Lower Limit of Normal of Parameter: This table lists which lower limits of normal (LLN) are provided by the study. If
the study does not have a formula for LLN, the LLN is set to 80% of the predicted for normal pa-
rameters (FVC, FEV1 etc.) and 90% of predicted for relative parameters like FEV1/FVC%.
Additional remarks:
Lung Age: Lung Age is computed according to the following publication: Spirometric "Lung Age" Estima-
tion for Motivating Smoking Cessation. J.F. Morris, W. Temple. Prev Med 14, 655-662 (1985).
Scandinavian References: These predicted normals are always combined with the Zapletal references
for children.
the parameter is available in the study
the parameter is available in the study and it is used in EasyOne
the LLN of the parameter (see below) is computed according to the ATS recom-
mendations: LLN = Predicted - 1.645 * SEE (Standard Error of Estimate)
the value of the parameter is copied from listed parameter of the same source
FEV1/FVC% is computed from the predicted of FEV1 and FVC of the same source
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