condition mean min max ZT0-3 1.94231 1.94231 1.94231 ZT4-7 1.4226800000000002 1.4226800000000002 1.4226800000000002 ZT8-11 1.502145 1.502145 1.502145 ZT12-15 1.7003599999999999 1.7003599999999999 1.7003599999999999 ZT16-19 1.680915 1.680915 1.680915 ZT20-23 1.9072900000000002 1.9072900000000002 1.9072900000000002