condition mean min max ZT0-3 1620.35 1620.35 1620.35 ZT4-7 1622.6 1622.6 1622.6 ZT8-11 1749.3000000000002 1749.3000000000002 1749.3000000000002 ZT12-15 1686.1999999999998 1686.1999999999998 1686.1999999999998 ZT16-19 1709.65 1709.65 1709.65 ZT20-23 1733.85 1733.85 1733.85