Diagnostic performance of the machine learning algorithm before and after revisions to the automatic real-time user feedback that significantly increased the signal quality of the PPG recordings, with AFL recordings excluded
| Diagnostic performance . | Before revision . | After revision . | P . |
|---|---|---|---|
| Participants, n | 196 | 84 | – |
| Recordings, n | 12 826 | 5179 | – |
| Recording duration | 60 s | 60 s | – |
| PPG recordings with insufficient quality, n (%) | 526 (4.1) | 0 (0) | <0.0001 |
| PPG recordings with low certainty algorithmic classification, n (%) | 164 (1.4) | 29 (0.6) | <0.0001 |
| Sensitivity (%) | 99.6 [99.4–99.8] | 100.0 [100.0–100.0] | 0.0411 |
| Specificity (%) | 99.6 [99.5–99.7] | 99.8 [99.6–99.9] | 0.1170 |
| Accuracy (%) | 99.6 [99.5–99.7] | 99.8 [99.7–99.9] | 0.0195 |
| PPV (%) | 99.2 [98.9–99.5] | 99.2 [98.7–99.8] | 0.9137 |
| NPV (%) | 99.8 [99.7–99.9] | 100.0 [100.0–100.0] | 0.0065 |
| Diagnostic performance . | Before revision . | After revision . | P . |
|---|---|---|---|
| Participants, n | 196 | 84 | – |
| Recordings, n | 12 826 | 5179 | – |
| Recording duration | 60 s | 60 s | – |
| PPG recordings with insufficient quality, n (%) | 526 (4.1) | 0 (0) | <0.0001 |
| PPG recordings with low certainty algorithmic classification, n (%) | 164 (1.4) | 29 (0.6) | <0.0001 |
| Sensitivity (%) | 99.6 [99.4–99.8] | 100.0 [100.0–100.0] | 0.0411 |
| Specificity (%) | 99.6 [99.5–99.7] | 99.8 [99.6–99.9] | 0.1170 |
| Accuracy (%) | 99.6 [99.5–99.7] | 99.8 [99.7–99.9] | 0.0195 |
| PPV (%) | 99.2 [98.9–99.5] | 99.2 [98.7–99.8] | 0.9137 |
| NPV (%) | 99.8 [99.7–99.9] | 100.0 [100.0–100.0] | 0.0065 |
Corresponding 95% confidence intervals are shown within brackets.
AFL, atrial flutter; NPV, negative predictive value; PPG, photoplethysmography; PPV, positive predictive value.
Diagnostic performance of the machine learning algorithm before and after revisions to the automatic real-time user feedback that significantly increased the signal quality of the PPG recordings, with AFL recordings excluded
| Diagnostic performance . | Before revision . | After revision . | P . |
|---|---|---|---|
| Participants, n | 196 | 84 | – |
| Recordings, n | 12 826 | 5179 | – |
| Recording duration | 60 s | 60 s | – |
| PPG recordings with insufficient quality, n (%) | 526 (4.1) | 0 (0) | <0.0001 |
| PPG recordings with low certainty algorithmic classification, n (%) | 164 (1.4) | 29 (0.6) | <0.0001 |
| Sensitivity (%) | 99.6 [99.4–99.8] | 100.0 [100.0–100.0] | 0.0411 |
| Specificity (%) | 99.6 [99.5–99.7] | 99.8 [99.6–99.9] | 0.1170 |
| Accuracy (%) | 99.6 [99.5–99.7] | 99.8 [99.7–99.9] | 0.0195 |
| PPV (%) | 99.2 [98.9–99.5] | 99.2 [98.7–99.8] | 0.9137 |
| NPV (%) | 99.8 [99.7–99.9] | 100.0 [100.0–100.0] | 0.0065 |
| Diagnostic performance . | Before revision . | After revision . | P . |
|---|---|---|---|
| Participants, n | 196 | 84 | – |
| Recordings, n | 12 826 | 5179 | – |
| Recording duration | 60 s | 60 s | – |
| PPG recordings with insufficient quality, n (%) | 526 (4.1) | 0 (0) | <0.0001 |
| PPG recordings with low certainty algorithmic classification, n (%) | 164 (1.4) | 29 (0.6) | <0.0001 |
| Sensitivity (%) | 99.6 [99.4–99.8] | 100.0 [100.0–100.0] | 0.0411 |
| Specificity (%) | 99.6 [99.5–99.7] | 99.8 [99.6–99.9] | 0.1170 |
| Accuracy (%) | 99.6 [99.5–99.7] | 99.8 [99.7–99.9] | 0.0195 |
| PPV (%) | 99.2 [98.9–99.5] | 99.2 [98.7–99.8] | 0.9137 |
| NPV (%) | 99.8 [99.7–99.9] | 100.0 [100.0–100.0] | 0.0065 |
Corresponding 95% confidence intervals are shown within brackets.
AFL, atrial flutter; NPV, negative predictive value; PPG, photoplethysmography; PPV, positive predictive value.
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