Table 3.
Diagnostic Performance of the Sleepimage Ring with polysomnography (N = 39)
| Variable | Values (95% CI) | ||
|---|---|---|---|
| AHI ≥ 5 (N = 37) | AHI ≥ 15 (N = 23) | AHI ≥ 30 (N = 17) | |
| Sensitivity | 1.00 (1.00, 1.00) | 0.87 (0.73, 1.00) | 0.88 (0.73, 1.00) |
| Specificity | 1.00 (1.00, 1.00) | 0.69 (0.46, 0.91) | 0.91 (0.79, 1.00) |
| False-positive rate | 0.00 (0.00, 0.00) | 0.31 (0.09, 0.54) | 0.09 (0.00, 0.21) |
| False-negative rate | 0.00 (0.00, 0.00) | 0.13 (0.00, 0.27) | 0.12 (0.00, 0.27) |
| Positive likelihood ratio | NA | 2.78 (1.32, 5.85) | 9.71 (2.56, 36.80) |
| Negative likelihood ratio | NA | 0.19 (0.06, 0.57) | 0.13 (0.03, 0.48) |
| Positive predictive value | 1.00 (1.00, 1.00) | 0.80 (0.64, 0.96) | 0.88 (0.73, 1.00) |
| Negative predictive value | 1.00 (1.00, 1.00) | 0.79 (0.57, 1.00) | 0.91 (0.79, 1.00) |
| Accuracy | 1.00 (1.00, 1.00) | 0.79 (0.67, 0.92) | 0.90 (0.80, 0.99) |
| Youden index | 1.00 (1.00, 1.00) | 0.56 (0.29, 0.82) | 0.79 (0.60, 0.99) |
| Optimal cut-off value | 4 | 16 | 17 |
NPV, Negative predictive value; PPV, Positive predictive value; LR+, Positive likelihood ratio; LR-, Negative likelihood ratio