condition mean min max ZT0-3 0.0715006375 0.0 0.143001275 ZT4-7 0.359842691 0.3255835795 0.39410180250000004 ZT8-11 0.07332640275 0.0 0.1466528055 ZT12-15 0.583865375 0.2085982095 0.9591325405 ZT16-19 2.1521599900000004 2.054726092 2.249593888 ZT20-23 1.8010959645 1.64108827 1.9611036590000002