condition mean min max ZT0-3 1544.734647 1544.734647 1544.734647 ZT4-7 1910.5474865 1910.5474865 1910.5474865 ZT8-11 1933.4198300000003 1933.4198300000003 1933.4198300000003 ZT12-15 1680.348504 1680.348504 1680.348504 ZT16-19 1677.594653 1677.594653 1677.594653 ZT20-23 1670.914074 1670.914074 1670.914074