condition mean min max ZT0-3 47.873850000000004 44.4067 51.341 ZT4-7 46.14795 46.14795 46.14795 ZT8-11 63.874849999999995 63.874849999999995 63.874849999999995 ZT12-15 0 0 0 ZT16-19 78.0111 78.0111 78.0111 ZT20-23 61.95425 61.95425 61.95425