condition mean min max ZT0-3 17.052599999999998 17.052599999999998 17.052599999999998 ZT4-7 13.33625 13.33625 13.33625 ZT8-11 13.649899999999999 13.649899999999999 13.649899999999999 ZT12-15 12.71745 12.71745 12.71745 ZT16-19 24.0914 24.0914 24.0914 ZT20-23 16.50305 16.50305 16.50305