Duration (h) | 1 | 2 | 3 | 4 | 5 | 6 | 8 | 12 | 18 | 24 |
Bell’s ratios | 0.435 | 0.565 | 0.626 | 0.678 | 0.721 | 0.750 | 0.802 | 0.877 | 0.948 | 1.000 |