condition mean min max ZT0-3 10.859077500000001 9.81893 11.899225000000001 ZT4-7 16.08925 16.08925 16.08925 ZT8-11 18.074849999999998 18.074849999999998 18.074849999999998 ZT12-15 0 0 0 ZT16-19 23.34115 23.34115 23.34115 ZT20-23 21.81525 21.81525 21.81525