condition mean min max ZT0-3 0.528302 0.360753 0.695851 ZT4-7 0.265461 0.265461 0.265461 ZT8-11 0.2975835 0.2975835 0.2975835 ZT12-15 0 0 0 ZT16-19 0.590922 0.590922 0.590922 ZT20-23 1.0788675 1.0788675 1.0788675