condition mean min max ZT0-3 832.185827 832.185827 832.185827 ZT4-7 1896.7717435 1896.7717435 1896.7717435 ZT8-11 2724.5456145 2724.5456145 2724.5456145 ZT12-15 1888.200124 1888.200124 1888.200124 ZT16-19 1381.2346425 1381.2346425 1381.2346425 ZT20-23 1309.6745270000001 1309.6745270000001 1309.6745270000001