Table 2: Correlations among studied formulae and non-preexcited QT interval (QTi).
|
Formula |
Corrected formula |
Pearson correlation coefficient1 |
F |
Spearman rank1 |
|
1) QT = QTwpw - ∆ (mQT) |
BZT |
0.891 (p = 0.0002) |
34.687 |
0.864 (p = 0.0006) |
|
RBK |
0.917 (p < 0.001) |
47.653 |
0.900 (p = 0.0002) |
|
|
FRD |
0.929 (p < 0.0001) |
56.494 |
0.882 (p = 0.0003) |
|
|
FRM |
0.930 (p < 0.0001) |
57.561 |
0.945 (p < 0.0001) |
|
|
2) QT = QTwpw × (mQT/QTwpw) |
BZT |
0.788 (p = 0.004) |
14.738 |
0.845 (p = 0.001) |
|
RBK |
0.838 (p = 0.001) |
21.186 |
0.882 (p = 0.0003) |
|
|
FRD |
0.853 (p = 0.0008) |
24.199 |
0.827 (p = 0.002) |
|
|
FRM |
0.871 (p = 0.0004) |
28.333 |
0.936 (p < 0.0001) |
|
|
3) QT = QTwpw x(mQRS/QRSwpw + (QTi – QTwpw × (mQRS/QRSwpw)) |
BZT |
0.788 (p = 0.004) |
14.738 |
0.845 (p = 0.001) |
|
RBK |
0.838 (p = 0.001) |
21.186 |
0.882 (p = 0.0003) |
|
|
FRD |
0.853 (p = 0.0008) |
24.199 |
0.827 (p = 0.002) |
|
|
FRM |
0.871 (p = 0.0004) |
28.333 |
0.936 (p < 0.0001) |
|
|
4) QT = QTwpw – ((QTwpw – QTi)/QRSwpw) × QRSwpw |
BZT |
0.929 (p < 0.0001) |
56.472 |
0.927 (p < 0.0001) |
|
RBK |
0.953 (p < 0.0001) |
89.215 |
0.945 (p < 0.0001) |
|
|
FRD |
0.961 (p < 0.0001) |
109.846 |
0.918 (p < 0.0001) |
|
|
FRM |
0.964 (p < 0.0001) |
118.981 |
0.945 (p < 0.0001) |
|
|
5) QT = QTwpw – (∆/QRSwpw) × QRSw |
BZT |
0.918 (p < 0.0001) |
47.932 |
0.927 (p < 0.0001) |
|
RBK |
0.953 (p < 0.0001) |
89.82 |
0.945 (p < 0.0001) |
|
|
FRD |
0.956 (p < 0.0001) |
96.565 |
0.891 (p = 0.0002) |
|
|
FRM |
0.964 (p < 0.0001) |
119.774 |
0.945 (p < 0.0001) |
|
|
6) QT = QTwpw – m1(QRSwpw) + b1 |
BZT |
0.948 (p < 0.0001) |
79.871 |
0.936 (p < 0.0001) |
|
RBK |
0.971 (p < 0.0001) |
148.096 |
0.982 (p < 0.0001) |
|
|
FRD |
0.975 (p < 0.0001) |
174.699 |
0.927 (p < 0.0001) |
|
|
FRM |
0.977 (p < 0.0001) |
191.902 |
0.991 (p < 0.0001) |
|
|
7) QT = m2(QTwpw) + b2) |
BZT |
0.788 (p = 0.004) |
14.738 |
0.845 (p = 0.001) |
|
RBK |
0.838 (p = 0.001) |
21.186 |
0.882 (p = 0.0003) |
|
|
FRD |
0.853 (p = 0.0008) |
24.199 |
0.827 (p = 0.002) |
|
|
FRM |
0.871 (p = 0.0004) |
28.333 |
0.936 (p < 0.0001) |
|
|
JTwpw |
BZT |
0.953 (p < 0.0001) |
88.695 |
0.900 (p = 0.0004) |
|
RBK |
0.952 (p < 0.0001) |
87.927 |
0.973 (p < 0.0001) |
|
|
FRD |
0.967 (p < 0.0001) |
128.4 |
0.972 (p < 0.0001) |
|
|
FRM |
0.962 (p < 0.0001) |
111.944 |
0.936 (p < 0.0001) |
1Of each formula compared against non pre-excited QT (QTi) or JT(JTi).