condition mean min max ZT0-3 0.26553483333333333 0.163331 0.4173855 ZT4-7 0.15418700000000002 0.15418700000000002 0.15418700000000002 ZT8-11 0.0532935 0.0532935 0.0532935 ZT12-15 0.22741724999999996 0.0799945 0.37483999999999995 ZT16-19 0.0497873 0.0497873 0.0497873 ZT20-23 0.08635765000000001 0.08635765000000001 0.08635765000000001