condition mean min max ZT0-3 11.177392 11.177392 11.177392 ZT4-7 11.604631 11.604631 11.604631 ZT8-11 9.916842500000001 9.916842500000001 9.916842500000001 ZT12-15 11.1083505 11.1083505 11.1083505 ZT16-19 11.3869125 11.3869125 11.3869125 ZT20-23 11.177392 11.177392 11.177392