condition mean min max ZT0-3 28.989075 26.7178 31.26035 ZT4-7 16.6089 16.6089 16.6089 ZT8-11 19.81695 19.81695 19.81695 ZT12-15 0 0 0 ZT16-19 20.6358 20.6358 20.6358 ZT20-23 25.6751 25.6751 25.6751