Table 5 Correlation between QTc and RR, using the various correction formulae
Hodges formula | QTC | RR | Pearson’s correlation coefficient |
|---|---|---|---|
QTC vs RR day 0 (A-L) | 391.80 (24.40) | 0.54 (0.09) | −0.675 |
QTC vs RR day 3 (A-L) | 376.47 (22.66) | 0.72 (0.12) | −0.256 |
QTC vs RR day 7 (A-L) | 374.18 (19.19) | 0.69 (0.14) | 0.065 |
QTC vs RR day 0 (A-A) | 390.28 (26.59) | 0.52 (0.10) | −0.252 |
QTC vs RR day 3 (A-A) | 374.81 (21.77) | 0.78 (0.15) | −0.239 |
QTC vs RR day 7 (A-A) | 372.09 (21.94) | 0.70 (0.12) | 0.458 |
Bazett’s formula | QTc | RR | Correlation coefficient |
QTCb vs RR day 0 (A-L) | 406.03 (27.84) | 0.54 (0.09) | −0.373 |
QTCb vs RR day 3 (A-L) | 392.71 (27.99) | 0.72 (0.12) | −0.366 |
QTCb vs RR day 7 (A-L) | 389.36 (23.56) | 0.69 (0.14) | −0.14 |
QTCb vs RR day 0 (A-A) | 399.57 (33.44) | 0.52 (0.10) | 0.097 |
QTCb vs RR day 3 (A-A) | 388.04 (26.70) | 0.78 (0.15) | −0.492 |
QTCb vs RR day 7 (A-A) | 387.67 (27.20) | 0.70 (0.12) | −0.283 |
Fridericia’s formula | QTc | RR | Correlation coefficient |
QTCf vs RR day 0 (A-L) | 365.16 (23.11) | 0.54 (0.09) | 0.026 |
QTCf vs RR day 3 (A-L) | 370.54 (24.72) | 0.72 (0.12) | 0.032 |
QTCf vs RR day 7 (A-L) | 364.90 (22.85) | 0.69 (0.14) | 0.364 |
QTCf vs RR day 0 (A-A) | 357.42 (33.27) | 0.52 (0.10) | 0.419 |
QTCf vs RR day 3 (A-A) | 370.77 (22.20) | 0.78 (0.15) | −0.023 |
QTCf vs RR day 7 (A-A) | 364.71 (25.04) | 0.70 (0.12) | 0.116 |