condition mean min max ZT0-3 52.141164 52.141164 52.141164 ZT4-7 55.601616500000006 55.601616500000006 55.601616500000006 ZT8-11 51.9410635 51.9410635 51.9410635 ZT12-15 55.449935499999995 55.449935499999995 55.449935499999995 ZT16-19 57.199535 57.199535 57.199535 ZT20-23 61.32729 61.32729 61.32729