| Intra-observer variability | Inter-observer variability | ||
---|---|---|---|---|
Correlation coefficient (r) | p-value | Correlation coefficient (r) | p-value | |
Standard method (3a) | Â | Â | Â | Â |
 PER | 0.93 |  < 0.001 | 0.81 |  < 0.001 |
 tPER | 0.59 | 0.002 | 0.57 | 0.003 |
 PER/EDV | 0.83 |  < 0.001 | 0.45 | 0.021 |
 PFR | 0.93 |  < 0.001 | 0.83 |  < 0.001 |
 tPFR | 0.41 | 0.028 | -0.02 | 0.54 |
 PFR/EDV | 0.91 |  < 0.001 | 0.69 |  < 0.001 |
Compressed method (3b) | Â | Â | Â | Â |
 PER | 0.84 |  < 0.001 | 0.81 |  < 0.001 |
 tPER | 0.20 | 0.129 | 0.38 | 0.028 |
 PER/EDV | 0.85 |  < 0.001 | 0.76 |  < 0.001 |
 PFR | 0.85 |  < 0.001 | 0.79 |  < 0.001 |
 tPFR | 0.51 | 0.004 | 0.09 | 0.325 |
 PFR/EDV | 0.89 |  < 0.001 | 0.87 |  < 0.001 |