condition mean min max ZT0-3 6.8566899999999995 5.6787849999999995 8.034595 ZT4-7 13.1909 13.1909 13.1909 ZT8-11 41.362700000000004 41.362700000000004 41.362700000000004 ZT12-15 0 0 0 ZT16-19 25.7551 25.7551 25.7551 ZT20-23 18.186 18.186 18.186