condition mean min max ZT0-3 9.711611666666668 8.855885 10.422270000000001 ZT4-7 10.15635 10.15635 10.15635 ZT8-11 4.726274999999999 4.726274999999999 4.726274999999999 ZT12-15 5.4715050000000005 4.356725 6.586285 ZT16-19 4.04732 4.04732 4.04732 ZT20-23 4.54925 4.54925 4.54925