condition mean min max ZT0-3 1918.5500000000002 1918.5500000000002 1918.5500000000002 ZT4-7 1858.6 1858.6 1858.6 ZT8-11 1686.7 1686.7 1686.7 ZT12-15 1832.65 1832.65 1832.65 ZT16-19 1990.9499999999998 1990.9499999999998 1990.9499999999998 ZT20-23 2046.45 2046.45 2046.45