condition mean min max ZT0-3 0.5251418333333333 0.34620650000000003 0.6974075 ZT4-7 0.35045499999999996 0.35045499999999996 0.35045499999999996 ZT8-11 0.4599855 0.4599855 0.4599855 ZT12-15 0.7839419999999999 0.610561 0.9573229999999999 ZT16-19 0.9055835 0.9055835 0.9055835 ZT20-23 0.8128795 0.8128795 0.8128795