condition mean min max ZT0-3 1916.65 1916.65 1916.65 ZT4-7 2445.3 2445.3 2445.3 ZT8-11 1895.6 1895.6 1895.6 ZT12-15 1708.1999999999998 1708.1999999999998 1708.1999999999998 ZT16-19 1702.8000000000002 1702.8000000000002 1702.8000000000002 ZT20-23 1978.4499999999998 1978.4499999999998 1978.4499999999998