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 |
QTcb =Bazett’s corrected QTc; QTcf =Fridericia’s corrected QTc; QTch = Hodges’ corrected QTc; A-A=artesunate-amodiaquine; A-L=artemether-lumefantrine; RR=RR interval.