condition mean min max ZT0-3 3.79390999275 1.95766914 5.6301508455 ZT4-7 13.872311784999999 11.761822944999999 15.982800625 ZT8-11 19.49412779 16.576673635 22.411581945000002 ZT12-15 61.705211167499996 55.364965444999996 68.04545689 ZT16-19 74.47041952749998 71.29218768499999 77.64865137 ZT20-23 73.2880683275 71.441231665 75.13490499