condition mean min max ZT0-3 0.8750955 0.6462064999999999 1.1912850000000001 ZT4-7 0.869452 0.869452 0.869452 ZT8-11 0.6460635 0.6460635 0.6460635 ZT12-15 0.2550525 0.251897 0.258208 ZT16-19 0.250174 0.250174 0.250174 ZT20-23 0.559169 0.559169 0.559169