condition mean min max ZT0-3 32.809599999999996 32.809599999999996 32.809599999999996 ZT4-7 22.920650000000002 22.920650000000002 22.920650000000002 ZT8-11 16.6474 16.6474 16.6474 ZT12-15 19.25505 19.25505 19.25505 ZT16-19 15.7819 15.7819 15.7819 ZT20-23 27.469866666666668 27.469866666666668 27.469866666666668