condition mean min max ZT0-3 29.04587333333333 8.32772 47.317449999999994 ZT4-7 8.608765 8.608765 8.608765 ZT8-11 10.95105 10.95105 10.95105 ZT12-15 16.42435 13.6445 19.2042 ZT16-19 23.6946 23.6946 23.6946 ZT20-23 43.50875 43.50875 43.50875