condition mean min max ZT0-3 2.08352 2.08352 2.08352 ZT4-7 1.40378 1.40378 1.40378 ZT8-11 1.094815 1.094815 1.094815 ZT12-15 1.2128615 1.2128615 1.2128615 ZT16-19 3.5877549999999996 3.5877549999999996 3.5877549999999996 ZT20-23 2.136905 2.136905 2.136905