condition mean min max ZT0-3 1851.5 1851.5 1851.5 ZT4-7 1576.3 1576.3 1576.3 ZT8-11 1636.55 1636.55 1636.55 ZT12-15 1816.7 1816.7 1816.7 ZT16-19 1995.25 1995.25 1995.25 ZT20-23 2216.65 2216.65 2216.65