Directions for Use
Appendix D Predictive Norms, etc.
69
About Norm Extrapolation
Extrapolation is the practice of applying a norm’s formula to a patient who doesn’t fit that
norm’s demographics. For example, if you were testing an 88-year-old man, and the
primary (selected) norm were based on males 85 or younger, the predicted values would
be extrapolated values.
•
When it takes place, extrapolation is indicated in the test record.
•
Pediatric norms do not provide any age, weight, or height extrapolation.
•
Adult norms allow extrapolation of age up, but not down.
•
Adult norms allow extrapolation of height, weight, and smoke years, up and down.
About Race Adjustment
Although expected values for certain parameters vary significantly between ethnic
groups, some norm studies do not include separate regression equations for different
races. For those studies, the following table describes the adjustments made by the
CP 200 software for the FVC and FEV1 predicted values. Where applicable, norm values
are multiplied by the percentages identified in the following table.
Race Choices
FVC & FEV1
Recommendation Source
Caucasian
No adjustment
—
Black
88%
ATS
Asian
94%
NIOSH
Hispanic
No adjustment
None found
Native American
94%
NIOSH
Polynesian
94%
NIOSH
Aboriginal
94%
NIOSH
Indian
94%
NIOSH
Note
Race adjustment applies for adults only.
If a race adjustment percentage is used, the same adjustment is applied to the
LLN value.
Summary of Contents for CP 200
Page 1: ...CP 200 Spirometry Option Directions for Use ...
Page 34: ...30 Chapter 3 Calibrating the Spirometer Welch Allyn CP 200 Spirometry Option ...
Page 52: ...48 Chapter 4 Performing Spirometry Tests Welch Allyn CP 200 Spirometry Option ...
Page 53: ...49 5 Troubleshooting Problem Solving Suggestions 50 Limited Warranty 51 Service Policy 51 ...
Page 56: ...52 Chapter 5 Troubleshooting Welch Allyn CP 200 Spirometry Option ...
Page 80: ...76 Appendix D Predictive Norms etc Welch Allyn CP 200 Spirometry Option ...
Page 91: ......