condition mean min max ZT0-3 1.05797775 1.018895 1.0970605 ZT4-7 0.9036975 0.9036975 0.9036975 ZT8-11 1.291305 1.291305 1.291305 ZT12-15 0 0 0 ZT16-19 1.65011 1.65011 1.65011 ZT20-23 1.46597 1.46597 1.46597