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Bland Altman plots showing the mean difference (thin lines) and the limits of agreement (2 SD; thick lines) for polysomnography apnea hypopnea index (PSG AHI), nasal flow respiratory disturbance index (NF RDI) and oxygen desaturation index ≥3% (ODI 3%) on the first night (A and B) and after 3 nights (C and D) at home. NF RDI overestimated AHI while ODI 3% underestimated AHI. The limits of agreement were comparable for both devices and were generally lower at low AHI.
