condition mean min max ZT0-3 8.821924 8.821924 8.821924 ZT4-7 9.9442625 9.9442625 9.9442625 ZT8-11 9.7641895 9.7641895 9.7641895 ZT12-15 8.7437875 8.7437875 8.7437875 ZT16-19 9.461614 9.461614 9.461614 ZT20-23 9.971852 9.971852 9.971852