condition mean min max ZT0-3 9.379541666666666 2.16897 21.244999999999997 ZT4-7 4.61803 4.61803 4.61803 ZT8-11 0.41796 0.41796 0.41796 ZT12-15 0.46879824999999997 0.1840595 0.753537 ZT16-19 0.0577645 0.0577645 0.0577645 ZT20-23 0.38152699999999995 0.38152699999999995 0.38152699999999995