condition mean min max ZT0-3 6.71262 5.955025 7.4702150000000005 ZT4-7 16.53155 16.53155 16.53155 ZT8-11 26.540399999999998 26.540399999999998 26.540399999999998 ZT12-15 0 0 0 ZT16-19 6.715624999999999 6.715624999999999 6.715624999999999 ZT20-23 4.6654599999999995 4.6654599999999995 4.6654599999999995