condition mean min max ZT0-3 1.71352 1.67503 1.7520099999999998 ZT4-7 1.258255 1.258255 1.258255 ZT8-11 2.3840649999999997 2.3840649999999997 2.3840649999999997 ZT12-15 0 0 0 ZT16-19 3.2737 3.2737 3.2737 ZT20-23 3.1280400000000004 3.1280400000000004 3.1280400000000004