condition mean min max ZT0-3 3.3794983333333333 2.25812 4.185605 ZT4-7 1.410965 1.410965 1.410965 ZT8-11 2.02644 2.02644 2.02644 ZT12-15 2.59879 2.3155650000000003 2.882015 ZT16-19 3.205065 3.205065 3.205065 ZT20-23 5.096534999999999 5.096534999999999 5.096534999999999