condition mean min max ZT0-3 8.70779 8.70779 8.70779 ZT4-7 8.475235 8.475235 8.475235 ZT8-11 7.962899999999999 7.962899999999999 7.962899999999999 ZT12-15 11.9179 11.9179 11.9179 ZT16-19 10.99222 10.99222 10.99222 ZT20-23 8.4451 8.4451 8.4451