condition mean min max ZT0-3 20.90635 20.3189 21.4938 ZT4-7 10.554875 10.554875 10.554875 ZT8-11 7.4103449999999995 7.4103449999999995 7.4103449999999995 ZT12-15 0 0 0 ZT16-19 10.027655 10.027655 10.027655 ZT20-23 12.95715 12.95715 12.95715