condition mean min max ZT0-3 0.5344311666666667 0.52642 0.541023 ZT4-7 0.257687 0.257687 0.257687 ZT8-11 0.395613 0.395613 0.395613 ZT12-15 0.8792644999999999 0.604524 1.154005 ZT16-19 0.9431375 0.9431375 0.9431375 ZT20-23 1.33624 1.33624 1.33624