About composite norm values – Welch Allyn CP 200 Spirometry Option - User Manual User Manual
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Appendix D Predictive Norms, etc.
Welch Allyn CP 200 Spirometry Option
About Composite Norm Values
When the primary (selected) norm does not support a given parameter — and when
composite norm values are enabled in the operation settings — the missing value is filled
in from one of the alternative (composite) norm sources, listed here. For example, since
the Crapo norm does not support FEV6, this value is filled in from NHANES III.
The primary norm takes precedence over the composite source. For example, since the
Crapo norm supports the FVC parameter, this value always comes from Crapo, not from
the composite source.
Composite values are used when the patient does not fit the demographics of either
primary norm (adult or pediatric). For example, if the primary norms are Dockery and
Morris, a 14-year-old patient fits neither norm due to age restrictions. The software would
use values from the appropriate composite norms, for example, NHANES III or ECCS/
Quanjer 1993. It would not use values from Dockery or Morris.
On the screen and in reports, an abbreviation identifies the norm source for each
composite value used. For example, the abbreviation for Polgar is “po.” All norm
abbreviations are listed under
Also see
on page 66 for a listing of the parameters included in each
norm.
To learn how to enable or disable composite norm values, see
Composite Norm Source
Parameters Filled In When Not Supported in Primary Norm
NHANES III
FVC, FEV1, FEV1%, FEV6, FEV1/FEV6, PEF, FEF25-75
Crapo 1981
FEV0.5, FEV3, FEV3/FVC
Morris 1971
FEF0.2-1.2
ECCS/Quanjer 1993
FEF25, FEF50, FEF75