condition mean min max ZT0-3 74.515393 74.515393 74.515393 ZT4-7 78.93915799999999 78.93915799999999 78.93915799999999 ZT8-11 73.50966149999999 73.50966149999999 73.50966149999999 ZT12-15 81.8764965 81.8764965 81.8764965 ZT16-19 82.0442875 82.0442875 82.0442875 ZT20-23 84.5489365 84.5489365 84.5489365