condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 10.3834605 10.3834605 10.3834605 ZT8-11 9.6991205 9.6991205 9.6991205 ZT12-15 9.7899885 9.7899885 9.7899885 ZT16-19 9.404234 9.404234 9.404234 ZT20-23 10.5506475 10.5506475 10.5506475