condition mean min max ZT0-3 0.75624210375 0.5513047375 0.96117947 ZT4-7 1.4953234725 0.9206113785 2.0700355665 ZT8-11 3.1216860134999997 2.892008566 3.351363461 ZT12-15 3.4174291552500002 2.909266154 3.9255921565000005 ZT16-19 3.743332228 3.0738097925 4.4128546635 ZT20-23 7.1461153025 6.1242494375 8.1679811675