condition mean min max ZT0-3 2.10595 1.620795 2.5911049999999998 ZT4-7 0.776171 0.776171 0.776171 ZT8-11 0.4609685 0.4609685 0.4609685 ZT12-15 0 0 0 ZT16-19 1.585861 1.585861 1.585861 ZT20-23 1.5908 1.5908 1.5908