condition mean min max ZT0-3 1094.867473 1094.867473 1094.867473 ZT4-7 1595.403364 1595.403364 1595.403364 ZT8-11 1591.512764 1591.512764 1591.512764 ZT12-15 1672.9843685 1672.9843685 1672.9843685 ZT16-19 1991.565577 1991.565577 1991.565577 ZT20-23 2165.633688 2165.633688 2165.633688