condition mean min max ZT0-3 1.223978 1.223978 1.223978 ZT4-7 0.8480844999999999 0.8480844999999999 0.8480844999999999 ZT8-11 0.938688 0.938688 0.938688 ZT12-15 0.42441799999999996 0.42441799999999996 0.42441799999999996 ZT16-19 0.1411809 0.1411809 0.1411809 ZT20-23 0.576055 0.576055 0.576055