condition mean min max ZT0-3 1.2796500000000002 1.2796500000000002 1.2796500000000002 ZT4-7 0.867238 0.867238 0.867238 ZT8-11 1.55685 1.55685 1.55685 ZT12-15 1.49938 1.49938 1.49938 ZT16-19 1.57943 1.57943 1.57943 ZT20-23 1.438445 1.438445 1.438445