condition mean min max ZT0-3 724.155134 724.155134 724.155134 ZT4-7 723.1979895 723.1979895 723.1979895 ZT8-11 826.8008595 826.8008595 826.8008595 ZT12-15 871.3534629999999 871.3534629999999 871.3534629999999 ZT16-19 676.5376329999999 676.5376329999999 676.5376329999999 ZT20-23 614.8532580000001 614.8532580000001 614.8532580000001