condition mean min max ZT0-3 1675.693595 1675.693595 1675.693595 ZT4-7 1785.5560795 1785.5560795 1785.5560795 ZT8-11 1104.8718975000002 1104.8718975000002 1104.8718975000002 ZT12-15 841.6171425 841.6171425 841.6171425 ZT16-19 540.7809135 540.7809135 540.7809135 ZT20-23 596.655491 596.655491 596.655491