condition mean min max ZT0-3 3.032208333333333 1.6609349999999998 4.693015 ZT4-7 2.366825 2.366825 2.366825 ZT8-11 0.8245 0.8245 0.8245 ZT12-15 1.6193657499999998 0.2739765 2.964755 ZT16-19 0.76733 0.76733 0.76733 ZT20-23 1.186632 1.186632 1.186632