condition mean min max ZT0-3 33.4865 32.501599999999996 34.4714 ZT4-7 32.864850000000004 32.864850000000004 32.864850000000004 ZT8-11 19.119799999999998 19.119799999999998 19.119799999999998 ZT12-15 0 0 0 ZT16-19 12.61325 12.61325 12.61325 ZT20-23 20.4095 20.4095 20.4095