condition mean min max ZT0-3 0.2604224 0.1912348 0.32961 ZT4-7 0.6449435 0.6449435 0.6449435 ZT8-11 0.7160505 0.7160505 0.7160505 ZT12-15 0 0 0 ZT16-19 0.4931015 0.4931015 0.4931015 ZT20-23 0.40108 0.40108 0.40108