condition mean min max ZT0-3 12.405899999999999 12.405899999999999 12.405899999999999 ZT4-7 8.16993 8.16993 8.16993 ZT8-11 9.29195 9.29195 9.29195 ZT12-15 9.09006 9.09006 9.09006 ZT16-19 15.3629 15.3629 15.3629 ZT20-23 12.1512 12.1512 12.1512