condition mean min max ZT0-3 0.0322554 0.0322554 0.0322554 ZT4-7 0.042019 0.042019 0.042019 ZT8-11 0.05165775 0.05165775 0.05165775 ZT12-15 0.0464679 0.0464679 0.0464679 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0139897 0.0139897 0.0139897