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Table 4 Calculation of mean QT intervals and coefficients of variation on all noisy Resultant Vector ECGs by all Automatic Algorithms. T1, T2, T3, S1, S2 and Novel are the algorithms as described in main body of text. Res1, Res2, Res3, Res4, Res5, Res6, Res7 and Res8 are the resultant vector ECGs as described in the main body of text. The mean values and their standard deviations are in milliseconds and the coefficients of variation are in percentages.

From: Accuracy of popular automatic QT Interval algorithms assessed by a 'Gold Standard' and comparison with a Novel method: computer simulation study

  T1 T2 T3 S1 S2 Novel
Res1       
Mean 448.72 431.74 466.39 426.04 446.69 493.62
SD 3.43 1.64 14.92 3.88 6.19 0.895
%CV 0.76 0.38 3.20 0.91 1.39 0.18
Res2       
Mean 406.67 388.46 429.92 365.63 401.16 462.28
SD 2.03 1.06 17.34 7.64 5.38 0.88
%CV 0.50 0.27 4.05 2.09 1.34 0.19
Res3       
Mean 352.59 348.85 370.44 350.61 364.09 462.87
SD 0.74 0.70 0.81 2.34 3.61 5.68
%CV 0.21 0.20 0.22 0.67 0.99 1.22
Res4       
Mean 346.10 343.44 385.33 346.83 348.42 490.10
SD 0.71 0.74 1.33 0.64 1.17 0.63
%CV 0.21 0.22 0.34 0.19 0.34 0.13
Res5       
Mean 447.03 430.49 462.51 427.14 443.69 495.41
SD 1.94 0.78 17.09 3.75 2.11 1.63
%CV 0.43 0.18 3.69 0.88 0.48 0.33
Res6       
Mean 406.05 388 433.85 367.32 399.15 469.54
SD 1.89 1.01 14.64 7.04 5.93 8.41
%CV 0.47 0.26 3.38 1.92 1.49 1.79
Res7       
Mean 352.15 348.74 370.77 351.88 361.12 463.72
SD 0.48 0.44 0.92 2.07 3.29 4.58
%CV 0.14 0.13 0.25 0.59 0.91 0.99
Res8       
Mean 345.64 343.03 385.21 346.59 348.2 493.15
SD 0.58 0.70 1.36 0.60 1.48 0.70
%CV 0.17 0.20 0.35 0.17 0.42 0.14