condition mean min max ZT0-3 0.863362 0.2678145 1.2259425 ZT4-7 0.660012 0.660012 0.660012 ZT8-11 0.6833715 0.6833715 0.6833715 ZT12-15 1.0119682500000002 0.5728565000000001 1.4510800000000001 ZT16-19 1.523925 1.523925 1.523925 ZT20-23 1.359475 1.359475 1.359475