Table 3.
Diagnostic performance of Omron and Merlin single-lead ECGs for detecting atrial fibrillation
| n=999 Prevalence 7.9% | Interpretation | Omron single-lead ECG (95% CI) | Merlin single-lead ECG (95% CI) |
|---|---|---|---|
| Sensitivity (%) | Cardiologist: 1 | 95 (82 to 99) | 97 (85 to 100) |
| 2 | 95 (82 to 99) | 91 (77 to 98) | |
| 3 | 90 (77 to 97) | 98 (87 to 100) | |
| 4 | 98 (87 to 100) | 88 (74 to 96) | |
| Specificity (%) | Cardiologist: 1 | 75 (71 to 79) | 76 (71 to 80) |
| 2 | 98 (96 to 99) | 95 (93 to 97) | |
| 3 | 97 (96 to 99) | 92 (89 to 94) | |
| 4 | 95 (92 to 97) | 91 (88 to 94) | |
| Positive likelihood ratio | Cardiologist: 1 | 3.8 (3.2 to 4.6) | 3.99 (3.3 to 4.8) |
| 2 | 41.8 (22.5 to 77.5) | 18.8 (12.2 to 28.8) | |
| 3 | 35.8 (20.3 to 63.1) | 11.5 (8.5 to 15.6) | |
| 4 | 18.5 (12.6 to 27.2) | 10.1 (7.4 to 13.9) | |
| Negative likelihood ratio | Cardiologist: 1 | 0.07 (0.02 to 0.28) | 0.04 (0.01 to 0.26) |
| 2 | 0.05 (0.01 to 0.21) | 0.09 (0.03 to 0.27) | |
| 3 | 0.098 (0.04 to 0.25) | 0.03 (0.004 to 0.18) | |
| 4 | 0.02 (0.004 to 0.17) | 0.13 (0.06 to 0.3) | |
| Positive predictive value | Cardiologist: 1 | 24.1 (17.4 to 31.9) | 24.5 (17.6 to 32.5) |
| 2 | 77.8 (62.9 to 88.8) | 60.4 (46.0 to 73.5) | |
| 3 | 76.0 (61.8 to 86.9) | 50.6 (39.3 to 61.9) | |
| 4 | 62.1 (49.3 to 73.8) | 47.4 (36.0 to 59.1) | |
| Negative predictive value | Cardiologist: 1 | 99.4 (97.9 to 99.9) | 99.7 (98.3 to 100) |
| 2 | 99.5 (98.3 to 99.9) | 99.3 (97.9 to 99.8) | |
| 3 | 99.1 (97.8 to 99.8) | 99.8 (98.7 to 100) | |
| 4 | 99.8 (98.8 to 100) | 98.9 (97.3 to 99.6) |