condition mean min max ZT0-3 281.8208333333333 210.2535 345.70500000000004 ZT4-7 172.687 172.687 172.687 ZT8-11 158.252 158.252 158.252 ZT12-15 246.79049999999998 215.32 278.26099999999997 ZT16-19 267.8635 267.8635 267.8635 ZT20-23 352.781 352.781 352.781