condition mean min max ZT0-3 7.82097 7.82097 7.82097 ZT4-7 6.481339999999999 6.481339999999999 6.481339999999999 ZT8-11 6.17267 6.17267 6.17267 ZT12-15 6.746665 6.746665 6.746665 ZT16-19 9.088754999999999 9.088754999999999 9.088754999999999 ZT20-23 7.719659999999999 7.719659999999999 7.719659999999999