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Grades of the quality of respiratory muscle strength tests are useful indicators of the degree of confidence that a clinician may have in the results

Grades of the quality of respiratory muscle strength tests are useful indicators of the degree of confidence that a clinician may have in the results
A: Excellent effort with excellent repeatability (<5 cm H2O difference among measurements)
B: Good effort with good repeatability (5 to 10 cm H2O difference among measurements)
C: Fair to good effort with fair repeatability (10 to 20 cm H2O difference among measurements)
D: Only one apparently good maneuver
F: Unable to obtain good maneuvers or very poor repeatability
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