condition mean min max ZT0-3 1.07673175 0.9178934999999999 1.23557 ZT4-7 1.2222035 1.2222035 1.2222035 ZT8-11 0.6150694999999999 0.6150694999999999 0.6150694999999999 ZT12-15 0 0 0 ZT16-19 0.607399 0.607399 0.607399 ZT20-23 1.2183555 1.2183555 1.2183555