condition mean min max ZT0-3 0.854055 0.707314 1.000796 ZT4-7 0.28649199999999997 0.28649199999999997 0.28649199999999997 ZT8-11 0.565505 0.565505 0.565505 ZT12-15 0 0 0 ZT16-19 0.8437285 0.8437285 0.8437285 ZT20-23 0.2814735 0.2814735 0.2814735