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Scatter plot of the apnea hypopnea index (AHI) derived from the 2-hr PSG versus the FN-PSG along with the line of unity
The adjusted concordance correlation coefficient (CCC) for these data (adjusted for time spent supine and in stage REM) was 0.93, indicating a high degree of both precision and accuracy. Very few of our patients with an AHI ≥ 5 on the 2-hr PSG had an AHI < 5 on the FN-PSG (specificity = 93.1 (95% CI = 83.3, 98.1).
