condition mean min max ZT0-3 2075.584342 2075.584342 2075.584342 ZT4-7 1924.5526074999998 1924.5526074999998 1924.5526074999998 ZT8-11 2065.1496225 2065.1496225 2065.1496225 ZT12-15 1770.1008695 1770.1008695 1770.1008695 ZT16-19 1853.730597 1853.730597 1853.730597 ZT20-23 2066.1205595 2066.1205595 2066.1205595