condition mean min max ZT0-3 79.743225 79.743225 79.743225 ZT4-7 73.86789999999999 73.86789999999999 73.86789999999999 ZT8-11 77.45890833333334 77.45890833333334 77.45890833333334 ZT12-15 79.69645 79.69645 79.69645 ZT16-19 80.26569166666667 80.26569166666667 80.26569166666667 ZT20-23 86.047875 86.047875 86.047875