condition mean min max ZT0-3 0.262148 0.18616100000000002 0.338212 ZT4-7 0.285887 0.285887 0.285887 ZT8-11 2.458425 2.458425 2.458425 ZT12-15 1.42744075 1.1741815 1.6806999999999999 ZT16-19 2.22952 2.22952 2.22952 ZT20-23 0.3570145 0.3570145 0.3570145