condition mean min max ZT0-3 4063.966958 4063.966958 4063.966958 ZT4-7 3800.2525754999997 3800.2525754999997 3800.2525754999997 ZT8-11 4115.45825 4115.45825 4115.45825 ZT12-15 3959.785502 3959.785502 3959.785502 ZT16-19 4942.9928945 4942.9928945 4942.9928945 ZT20-23 4497.3440665 4497.3440665 4497.3440665