condition mean min max ZT0-3 10.517389999999999 10.517389999999999 10.517389999999999 ZT4-7 9.266784999999999 9.266784999999999 9.266784999999999 ZT8-11 6.249005 6.249005 6.249005 ZT12-15 9.075955 9.075955 9.075955 ZT16-19 9.201765 9.201765 9.201765 ZT20-23 10.3741 10.3741 10.3741