condition mean min max ZT0-3 47.864487 47.864487 47.864487 ZT4-7 50.190723 50.190723 50.190723 ZT8-11 50.678172 50.678172 50.678172 ZT12-15 45.930549 45.930549 45.930549 ZT16-19 44.369179 44.369179 44.369179 ZT20-23 48.4901955 48.4901955 48.4901955