condition mean min max ZT0-3 25.25645 25.25645 25.25645 ZT4-7 21.146552 21.146552 21.146552 ZT8-11 19.069573499999997 19.069573499999997 19.069573499999997 ZT12-15 19.352764 19.352764 19.352764 ZT16-19 19.3658765 19.3658765 19.3658765 ZT20-23 18.235098999999998 18.235098999999998 18.235098999999998