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Scatter plot (left) and Bland-Altman plot (right) for obstructive (top) and central (bottom) apnea-hypopnea index with mean bias (---) along with the ±1.96 SD limits of bias (---). Hypopneas were scored using the 3% desaturation or arousal criteria for polysomnography and 3% desaturation only for respiratory polygraphy.
