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Bivariate correlations. (A) Correlation between apneahypopnea index (AHI) and average exercise time (min) in the Long-Term Concordia participants (P < 0.05), and between (B) AHI and the mean coefficient of variation for pulsed-oxygen saturation (mean SpO2 CV; an indirect measure of altered ventilatory drive) in the Concordia over-winter participants.
