Correlations Between Variables Preoperatively The Cotton-Myer classification showed a marginally significant weak correlation with PEF, EDI, PIF, and TPF, whereas the DI and VHI did not correlate with the spirometry measures or with the Cotton-Myer scale ( Table 2 ).
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Monitoring Adult Subglottic Stenosis With Spirometry and Dyspnea Index: A Novel Approach.
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