Table 2.
Reproducibility agreement of ECG measurements (n = 247 participants)
| Parameter | ECG 1 (mean±SD) |
ECG 2 (mean±SD) |
Bias | % Bias |
95% Limits of Agreement |
Pearson, r |
Lin’s, ρc [95%CI] |
Bradley- Blackwood F (P) |
|---|---|---|---|---|---|---|---|---|
| Heart rate, bpm | 67.06±15.26 | 67.52±15.35 | −0.46 | −0.67 | [−7.45; 6.54] | 0.97 | 0.97[0.97–0.98] | 2.11(0.123) |
| Average QRS, ms | 93.43±17.19 | 93.47±16.67 | −0.04 | −0.04 | [−8.80; 8.80] | 0.97 | 0.97 [0.96–0.97] | 1.67(0.191) |
| QRS axis, deg | 51.35±42.47 | 52.74±42.10 | −1.39 | −2.64 | [−29.83; 27.06] | 0.94 | 0.94 [0.93–0.96] | 1.20(0.303) |
| T axis, deg | 41.74±39.14 | 41.91±38.04 | −0.17 | −0.41 | [−21.51; 21.16] | 0.96 | 0.96 [0.95–0.97] | 1.35(0.262) |
| Average QTc, ms | 427.24±30.12 | 429.32±27.81 | −2.07 | −0.48 | [−39.70; 35.55] | 0.78 | 0.78 [0.73–0.83] | 3.47(0.033) |
| Average QT, ms | 411.41±45.32 | 411.99±44.37 | −0.58 | −0.14 | [−29.90; 28.73] | 0.95 | 0.94 [0.93–0.96] | 0.70(0.500) |
| QRS V1, ms | 90.74±17.67 | 90.85±17.43 | −0.10 | −0.11 | [−12.77; 12.56] | 0.93 | 0.93 [0.92–0.95] | 0.21(0.814) |
| QRS V2, ms | 88.67±16.56 | 88.75±15.92 | −0.09 | −0.10 | [−11.13; 10.96] | 0.94 | 0.94 [0.93–0.95] | 1.65(0.193) |
| QRS V3, ms | 88.19±16.92 | 87.87±17.34 | 0.32 | 0.36 | [−10.39; 11.03] | 0.95 | 0.95 [0.94–0.96] | 1.16(0.314) |
| Intrinsicoid V1, ms | 41.74±11.57 | 41.98±11.72 | −0.243 | −0.58 | [−8.47; 7.98] | 0.94 | 0.94 [0.92–0.95] | 0.57(0.564) |
| Intrinsicoid V2, ms | 43.45±11.26 | 43.55±11.11 | −0.097 | −0.22 | [−9.61; 9.42] | 0.91 | 0.91 [0.88–0.93] | 0.18(0.832) |
| Intrinsicoid V3, ms | 42.45±12.79 | 42.83±13.71 | −0.39 | −0.91 | [−15.48; 14.70] | 0.83 | 0.83 [0.79–0.87] | 2.26(0.106) |
| TAD V1, ms | 49.00±15.42 | 48.87±15.41 | 0.140 | 0.29 | [−13.23; 13.51] | 0.90 | 0.90 [0.88–0.93] | 0.05(0.945) |
| TAD V2, ms | 45.21±15.61 | 45.21±15.25 | 0.008 | 0.02 | [−12.42; 12.44] | 0.92 | 0.92 [0.90–0.94] | 0.43(0.649) |
| TAD V3, ms | 45.7±17.0 | 45.0±17.2 | 0.709 | 1.58 | [−17.61; 19.02] | 0.85 | 0.85[0.82–0.88] | 0.73(0.482) |
| T amplitude V1, µV | −98.0±144.5 | −96.2±143.2 | −1.81 | −1.84 | [−74.33; 70.70] | 0.97 | 0.97 [0.96–0.98] | 0.37(0.688) |
| T amplitude V2, µV | 211.9±329.9 | 215.5±327.2 | −3.64 | −1.69 | [−119.0; 111.7] | 0.98 | 0.98 [0.98–0.99] | 0.60(0.549) |
| T amplitude V3, µV | 251.4±322.0 | 244.2±322.7 | 7.18 | 2.85 | [−125.8; 140.1] | 0.98 | 0.98 [0.97–0.98] | 1.39(0.252) |
| T amplitude V4, µV | 305.7±302.0 | 302.2±297.2 | 3.49 | 1.14 | [−124.8; 131.8] | 0.98 | 0.98 [0.97–0.98] | 1.02(0.361) |