condition mean min max ZT0-3 8.709248333333333 1.676855 14.74985 ZT4-7 1.934925 1.934925 1.934925 ZT8-11 2.909445 2.909445 2.909445 ZT12-15 5.8571425 3.8482700000000003 7.866015 ZT16-19 13.5154 13.5154 13.5154 ZT20-23 12.114899999999999 12.114899999999999 12.114899999999999