Table 4 Initial contact detection (ICD) performance measures. Sensitivity, positive predictive value, absolute and relative errors, and overall performance index for the ICD algorithms. Values are expressed as mean and 95% confidence intervals (CI) for each cohort. In italic face: recommended algorithms. Underlined performance index indicates top-ranked algorithm for the specific cohort of that row
Cohort | Initial contact detection | ||||
|---|---|---|---|---|---|
Sensitivity | Positive predictive value | Absolute error [s] | Relative error [%] | Performance index | |
ICDA | |||||
 HA | 0.80 [0.79, 0.81] | 0.91 [0.90, 0.92] | 0.06 [0.05, 0.06] | 8.0 [7.7, 8.3] | 0.804 |
 CHF | 0.79 [0.77, 0.80] | 0.89 [0.88, 0.91] | 0.07 [0.06, 0.07] | 10.9 [10.1, 11.8] | 0.771 |
 COPD | 0.81 [0.81, 0.82] | 0.93 [0.92, 0.94] | 0.07 [0.06, 0.07] | 9.1 [8.8, 9.3] | 0.790 |
 MS | 0.80 [0.79, 0.82] | 0.92 [0.91, 0.93] | 0.06 [0.06, 0.06] | 8.4 [8.1, 8.7] | 0.805 |
 PD | 0.79 [0.77, 0.80] | 0.90 [0.89, 0.91] | 0.06 [0.06, 0.06] | 8.3 [7.9, 8.6] | 0.798 |
 PFF | 0.80 [0.78, 0.81] | 0.89 [0.88, 0.90] | 0.05 [0.05, 0.06] | 7.6 [7.3, 7.9] | 0.818 |
ICDB | |||||
 HA | 0.80 [0.79, 0.81] | 0.86 [0.85, 0.87] | 0.13 [0.13, 0.13] | 18.0 [17.8, 18.3] | 0.641 |
 CHF | 0.80 [0.78, 0.81] | 0.88 [0.86, 0.90] | 0.13 [0.13, 0.14] | 19.9 [19.3, 20.4] | 0.641 |
 COPD | 0.78 [0.77, 0.79] | 0.85 [0.84, 0.86] | 0.15 [0.15, 0.15] | 21.2 [20.9, 21.5] | 0.590 |
 MS | 0.75 [0.73, 0.77] | 0.81 [0.79, 0.83] | 0.14 [0.14, 0.15] | 19.8 [19.3, 20.4] | 0.595 |
 PD | 0.80 [0.78, 0.81] | 0.86 [0.84, 0.88] | 0.14 [0.14, 0.14] | 19.2 [18.9, 19.6] | 0.620 |
 PFF | 0.80 [0.79, 0.82] | 0.86 [0.85, 0.88] | 0.13 [0.13, 0.13] | 17.9 [17.5, 18.2] | 0.641 |
ICDC | |||||
 HA | 0.82 [0.81, 0.83] | 0.86 [0.85, 0.88] | 0.06 [0.06, 0.07] | 8.9 [8.6, 9.2] | 0.795 |
 CHF | 0.81 [0.80, 0.82] | 0.87 [0.85, 0.88] | 0.07 [0.07, 0.08] | 11.1 [10.2, 11.9] | 0.771 |
 COPD | 0.83 [0.82, 0.83] | 0.90 [0.89, 0.91] | 0.07 [0.07, 0.07] | 9.7 [9.4, 9.9] | 0.786 |
 MS | 0.82 [0.81, 0.84] | 0.89 [0.87, 0.90] | 0.07 [0.06, 0.07] | 9.2 [8.8, 9.6] | 0.783 |
 PD | 0.80 [0.78, 0.81] | 0.84 [0.82, 0.86] | 0.07 [0.07, 0.07] | 9.4 [9.0, 9.8] | 0.766 |
 PFF | 0.80 [0.79, 0.82] | 0.81 [0.79, 0.82] | 0.07 [0.07, 0.07] | 9.6 [9.2, 10.0] | 0.759 |
ICDD | |||||
 HA | 0.78 [0.77, 0.79] | 0.88 [0.87, 0.89] | 0.10 [0.10, 0.10] | 14.1 [13.8, 14.5] | 0.705 |
 CHF | 0.79 [0.78, 0.81] | 0.92 [0.91, 0.93] | 0.09 [0.09, 0.10] | 13.8 [13.4, 14.3] | 0.735 |
 COPD | 0.76 [0.75, 0.77] | 0.89 [0.88, 0.90] | 0.11 [0.11, 0.12] | 15.9 [15.5, 16.3] | 0.680 |
 MS | 0.78 [0.77, 0.80] | 0.89 [0.88, 0.91] | 0.10 [0.10, 0.11] | 14.4 [13.9, 15.0] | 0.706 |
 PD | 0.76 [0.75, 0.78] | 0.86 [0.84, 0.87] | 0.11 [0.11, 0.11] | 15.4 [15.0, 15.8] | 0.674 |
 PFF | 0.80 [0.78, 0.81] | 0.86 [0.85, 0.88] | 0.10 [0.09, 0.10] | 13.6 [13.1, 14.1] | 0.706 |