condition mean min max ZT0-3 366.385903 366.385903 366.385903 ZT4-7 119.622466 119.622466 119.622466 ZT8-11 108.67387049999999 108.67387049999999 108.67387049999999 ZT12-15 177.058182 177.058182 177.058182 ZT16-19 927.6640924999999 927.6640924999999 927.6640924999999 ZT20-23 669.7429975 669.7429975 669.7429975