condition mean min max ZT0-3 14.30125 13.054549999999999 15.865549999999999 ZT4-7 12.79025 12.79025 12.79025 ZT8-11 14.661200000000001 14.661200000000001 14.661200000000001 ZT12-15 17.447074999999998 17.2807 17.61345 ZT16-19 17.9839 17.9839 17.9839 ZT20-23 21.718899999999998 21.718899999999998 21.718899999999998