condition mean min max ZT0-3 1975.4 1975.4 1975.4 ZT4-7 2179.5 2179.5 2179.5 ZT8-11 1956.15 1956.15 1956.15 ZT12-15 1715.55 1715.55 1715.55 ZT16-19 1963.85 1963.85 1963.85 ZT20-23 1971.65 1971.65 1971.65