condition mean min max ZT0-3 6.1081975 5.860015000000001 6.35638 ZT4-7 4.611775 4.611775 4.611775 ZT8-11 13.108149999999998 13.108149999999998 13.108149999999998 ZT12-15 0 0 0 ZT16-19 9.46698 9.46698 9.46698 ZT20-23 7.238695 7.238695 7.238695