Table 3.
Diagnostic agreement of AHI for the simultaneous (in-laboratory) PSG and PDX, the in-laboratory PSG and at-home PDX, and the simultaneous in-laboratory and separate PSGs, and diagnostic agreement/disagreement criteria
| Simultaneous PDX versus simultaneous PSG | At-home PDX versus simultaneous PSG | Separate PSG versus simultaneous PSG | |
|---|---|---|---|
| Agreement (%) | 96.5 | 83.5 | 85.9 |
| Overestimation (%) | 1.2 | 5.9 | 3.5 |
| Underestimation (%) | 2.4 | 10.6 | 10.6 |
| Diagnostic classification | PSG AHI | PDX AHI | |
| Agreement | ≥30 | ≥30 | |
| Agreement | <30 | PSG AHI ≤10 | |
| Overestimation | <30 | PSG AHI +>10 | |
| Underestimation | <30 | PSG AHI –>10 |
Abbreviations: AHI, apnea hypopnea index; PSG, polysomnography.