condition mean min max ZT0-3 8.530765 8.530765 8.530765 ZT4-7 30.85135 30.85135 30.85135 ZT8-11 13.28005 13.28005 13.28005 ZT12-15 3.4569199999999998 3.4569199999999998 3.4569199999999998 ZT16-19 0.443137 0.443137 0.443137 ZT20-23 0.539447 0.539447 0.539447