condition mean min max ZT0-3 12.4938 12.2707 12.716899999999999 ZT4-7 12.23815 12.23815 12.23815 ZT8-11 16.928649999999998 16.928649999999998 16.928649999999998 ZT12-15 0 0 0 ZT16-19 14.6079 14.6079 14.6079 ZT20-23 12.32625 12.32625 12.32625