condition mean min max ZT0-3 0.687173 0.687173 0.687173 ZT4-7 0.04581005 0.04581005 0.04581005 ZT8-11 0.04970825 0.04970825 0.04970825 ZT12-15 0.1507865 0.1507865 0.1507865 ZT16-19 0.67927 0.67927 0.67927 ZT20-23 0.830403 0.830403 0.830403