Agreement between the in-laboratory flow respiratory disturbance index (RDI) and apnoea/hypopnoea index (AHI)
| FNH | TCH | All | |
| Subjects | 50 | 50 | 100 |
| Correlation between AHI and flow-RDI r | 0.95 | 0.93 | 0.94 (0.91–0.96) |
| Difference between AHI and flow-RDI | -8.2±9.1 | -10.8±12.0 | -9.5±10.7 |
| Diagnostic ability of flow-RDI | |||
| AHI >5 events·h−1 | |||
| Sensitivity | 0.96 | 0.96 | 0.96 (0.91–1.00) |
| Specificity | 0.83 | 0.80 | 0.82 (0.59–1.00) |
| P-LR | 5.7 | 4.8 | 5.3 (2.4–11.7) |
| N-LR | 0.05 | 0.06 | 0.05 (0.03–0.09) |
| AUC | 0.94 | 0.95 | 0.95 (0.90–0.99) |
| AHI >15 events·h−1 | |||
| Sensitivity | 0.90 | 0.91 | 0.91 (0.84–0.98) |
| Specificity | 0.90 | 0.73 | 0.82 (0.70–0.95) |
| P-LR | 8.6 | 3.4 | 5.2 (3.9–6.8) |
| N-LR | 0.11 | 0.12 | 0.11 (0.08–0.15) |
| AUC | 0.97 | 0.94 | 0.96 (0.92–0.99) |
| AHI >30 events·h−1 | |||
| Sensitivity | 0.83 | 0.93 | 0.89 (0.80–0.97) |
| Specificity | 0.92 | 1.00 | 0.96 (0.90–1.00) |
| P-LR | 10.8 | NA | 21.2 (8.3–54.6) |
| N-LR | 0.18 | 0.07 | 0.12 (0.09–0.16) |
| AUC | 0.96 | 0.99 | 0.98 (0.94–1.00) |
Data are presented as n or mean±sd, unless otherwise stated. 95% confidence intervals are given in parentheses. FNH: Fukuoka National Hosiptal, Fukuoka, Japan; TCH: Tenri City Hospital, Tenri, Japan; r: Pearson's correlation coefficient; P-LR: positive likelihood ratio; N-LR: negative likelihood ratio; AUC: area under the receiver-operating characteristic curve; NA: not available.