condition mean min max ZT0-3 17.081850000000003 16.372700000000002 17.791 ZT4-7 13.7492 13.7492 13.7492 ZT8-11 7.492635 7.492635 7.492635 ZT12-15 0 0 0 ZT16-19 14.04035 14.04035 14.04035 ZT20-23 16.381149999999998 16.381149999999998 16.381149999999998