condition mean min max ZT0-3 1.816865 1.816865 1.816865 ZT4-7 1.0208525000000002 1.0208525000000002 1.0208525000000002 ZT8-11 1.56246 1.56246 1.56246 ZT12-15 1.967555 1.967555 1.967555 ZT16-19 3.3243400000000003 3.3243400000000003 3.3243400000000003 ZT20-23 2.2458400000000003 2.2458400000000003 2.2458400000000003