Table 2.
Values for different cutoffs of manually edited AHI 4% measured by HSAT and the in-laboratory PM vs PSG.
| AHI 4%, Events/h | Prevalence | Sensitivity | Exact 95% CI | Specificity | Exact 95% CI | PPV | NPV | |||
|---|---|---|---|---|---|---|---|---|---|---|
| LB | UB | LB | UB | |||||||
| HSAT vs PSG | ≥ 5 | 77.9 | 86.7 | 74.9 | 93.7 | 76.5 | 49.8 | 92.2 | 92.9 | 61.9 |
| ≥ 10 | 58.4 | 95.6 | 83.6 | 99.2 | 75.0 | 56.2 | 87.9 | 84.3 | 92.3 | |
| ≥ 15 | 53.2 | 92.7 | 79.0 | 98.1 | 83.3 | 66.5 | 93.0 | 86.4 | 90.9 | |
| ≥ 30 | 40.3 | 71.0 | 51.8 | 85.1 | 97.8 | 87.0 | 99.9 | 95.7 | 83.3 | |
| In-laboratory PM vs PSG | ≥ 5 | 76.0 | 91.2 | 80.0 | 96.7 | 83.3 | 57.7 | 95.6 | 94.5 | 75.0 |
| ≥ 10 | 58.7 | 95.4 | 83.3 | 99.2 | 87.1 | 69.2 | 95.8 | 91.3 | 93.1 | |
| ≥ 15 | 53.3 | 97.5 | 85.3 | 99.9 | 91.4 | 75.8 | 97.8 | 92.9 | 97.0 | |
| ≥ 30 | 40.0 | 83.3 | 64.5 | 93.7 | 97.8 | 86.8 | 99.9 | 96.2 | 89.8 | |
Prevalence, sensitivity, specificity, PPV, and NPV for different cutoffs of manually edited AHI 4% from HSAT and the in-laboratory PM vs the PSG. Scoring of hypopneas required ≥ 4% oxygen desaturation according to HSAT and the in-laboratory PM and ≥ 4% oxygen desaturation and/or an arousal according to PSG. AHI = apnea-hypopnea index, CI = confidence interval, HSAT = home sleep apnea test, LB = lower bound, NPV = negative predictive value, PM = portable monitor, PPV = positive predictive value, PSG = polysomnography, UB = upper bound.