condition mean min max ZT0-3 697.636011 697.636011 697.636011 ZT4-7 745.055689 745.055689 745.055689 ZT8-11 841.5900795 841.5900795 841.5900795 ZT12-15 927.5526864999999 927.5526864999999 927.5526864999999 ZT16-19 1057.336559 1057.336559 1057.336559 ZT20-23 1129.9546875 1129.9546875 1129.9546875