condition mean min max ZT0-3 33.587475000000005 21.2223 45.952650000000006 ZT4-7 7.37468 7.37468 7.37468 ZT8-11 1.81513 1.81513 1.81513 ZT12-15 15.141472499999999 12.241444999999999 18.0415 ZT16-19 19.486116666666668 16.416 22.556233333333335 ZT20-23 0 0 0