condition mean min max ZT0-3 1971.35 1971.35 1971.35 ZT4-7 2091.5 2091.5 2091.5 ZT8-11 1946.15 1946.15 1946.15 ZT12-15 1917.65 1917.65 1917.65 ZT16-19 1981.9 1981.9 1981.9 ZT20-23 1882.0 1882.0 1882.0