condition mean min max ZT0-3 26.7551 26.7551 26.7551 ZT4-7 43.44372 43.44372 43.44372 ZT8-11 36.671949999999995 36.671949999999995 36.671949999999995 ZT12-15 35.58121666666666 35.58121666666666 35.58121666666666 ZT16-19 34.04049 34.04049 34.04049 ZT20-23 49.058479999999996 49.058479999999996 49.058479999999996