condition mean min max ZT0-3 0.20470149999999998 0.115859 0.29354399999999997 ZT4-7 0.53587 0.53587 0.53587 ZT8-11 0.4708775 0.4708775 0.4708775 ZT12-15 0 0 0 ZT16-19 0.750138 0.750138 0.750138 ZT20-23 0.2902555 0.2902555 0.2902555