condition mean min max ZT0-3 0.32163966666666666 0.226115 0.3771655 ZT4-7 0.286184 0.286184 0.286184 ZT8-11 0.223519 0.223519 0.223519 ZT12-15 1.17186675 0.7091385 1.634595 ZT16-19 0.9194875 0.9194875 0.9194875 ZT20-23 0.874573 0.874573 0.874573