condition mean min max ZT0-3 590.122089 590.122089 590.122089 ZT4-7 120.4188915 120.4188915 120.4188915 ZT8-11 91.9706345 91.9706345 91.9706345 ZT12-15 222.7213605 222.7213605 222.7213605 ZT16-19 319.7824635 319.7824635 319.7824635 ZT20-23 249.9629 249.9629 249.9629