condition mean min max ZT0-3 12.6218875 11.321625000000001 13.922149999999998 ZT4-7 6.947900000000001 6.947900000000001 6.947900000000001 ZT8-11 6.674015000000001 6.674015000000001 6.674015000000001 ZT12-15 0 0 0 ZT16-19 9.504825 9.504825 9.504825 ZT20-23 9.181899999999999 9.181899999999999 9.181899999999999