condition mean min max ZT0-3 778.895607 778.895607 778.895607 ZT4-7 913.708793 913.708793 913.708793 ZT8-11 985.4232890000001 985.4232890000001 985.4232890000001 ZT12-15 964.1868704999999 964.1868704999999 964.1868704999999 ZT16-19 657.385903 657.385903 657.385903 ZT20-23 556.2986915 556.2986915 556.2986915