Factors Affecting Acoustics and Speech Intelligibility in the Operating Room: Size Matters.

Multiple linear regression model fits and β coefficients for V R were highly significant for each of the intelligibility indices and were best for RT 60 (R 2 = 0.666, F(2, 37) = 39.9, P < .0001).

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Principal component analysis indicates that 79.42% of the variance in these indices can be explained by 1 component, and that 95.80% can be explained by 2 components, although the second component just missed significance due to an eigenvalue (0.983) <1.

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