condition mean min max ZT0-3 12.449649999999998 11.9719 12.927399999999999 ZT4-7 11.919599999999999 11.919599999999999 11.919599999999999 ZT8-11 11.15845 11.15845 11.15845 ZT12-15 0 0 0 ZT16-19 14.29225 14.29225 14.29225 ZT20-23 12.4917 12.4917 12.4917