Figure 3.

Misclassification of obstructive sleep apnea (OSA) presence and severity as a function of hour(s) studied. The respiratory event index (REI) measured at each time interval was compared with the final REI_TRT for each patient to determine whether the measured REI would have rendered a diagnosis or severity classification different from the REI_TRT. If the misclassification would have resulted in a reduced severity designation, it was considered an underestimate. The most extreme underestimate is a false negative, which is shown distinctly from those that underestimated disease severity. Conversely, if the misclassification would have resulted a false positive diagnosis of OSA or a higher severity level, these were both considered an overestimate. TRT, total recording time.