condition mean min max ZT0-3 1.9286825 1.7539850000000001 2.10338 ZT4-7 2.27388 2.27388 2.27388 ZT8-11 3.175525 3.175525 3.175525 ZT12-15 0 0 0 ZT16-19 1.771915 1.771915 1.771915 ZT20-23 2.43425 2.43425 2.43425