condition mean min max ZT0-3 1.2373649185 0.442158738 2.032571099 ZT4-7 3.4291560202499998 2.926482376 3.9318296645 ZT8-11 5.675266753000001 4.590306746 6.76022676 ZT12-15 12.438227287499998 10.88393616 13.992518415 ZT16-19 16.547484937500002 13.7807095 19.314260375 ZT20-23 28.51588122 24.582702750000003 32.44905969