condition mean min max ZT0-3 27.8052 27.8052 27.8052 ZT4-7 19.1759 19.1759 19.1759 ZT8-11 13.729199999999999 13.729199999999999 13.729199999999999 ZT12-15 18.7804 18.7804 18.7804 ZT16-19 24.06595 24.06595 24.06595 ZT20-23 27.479950000000002 27.479950000000002 27.479950000000002