condition mean min max ZT0-3 1.942965 1.942965 1.942965 ZT4-7 0.4587715 0.4587715 0.4587715 ZT8-11 1.1549900000000002 1.1549900000000002 1.1549900000000002 ZT12-15 1.70758 1.70758 1.70758 ZT16-19 1.603615 1.603615 1.603615 ZT20-23 0.898239 0.898239 0.898239