condition mean min max ZT0-3 1.129589 1.093798 1.1653799999999999 ZT4-7 2.73964 2.73964 2.73964 ZT8-11 3.12167 3.12167 3.12167 ZT12-15 0 0 0 ZT16-19 2.563475 2.563475 2.563475 ZT20-23 2.202185 2.202185 2.202185