condition mean min max ZT0-3 28.4068 28.115099999999998 28.698500000000003 ZT4-7 30.77765 30.77765 30.77765 ZT8-11 35.749449999999996 35.749449999999996 35.749449999999996 ZT12-15 0 0 0 ZT16-19 35.12225 35.12225 35.12225 ZT20-23 31.3645 31.3645 31.3645