Signal Quality of Reflective-Mode Photoplethysmograms Across Anatomical Sites.

The differences between finger and wrist were highly significant ( p < 0.001, Wilcoxon test, for all wavelengths and sensors), confirming the finger as the most reliable site and the wrist as the most challenging location for reflective-mode PPG acquisition.

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HR estimation across different kurtosis ranges did not show a clear trend, indicating that this SQI does not provide a direct criterion for identifying PPG signal conditions associated with HR estimation, unlike skewness and perfusion index.

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