condition mean min max ZT0-3 10.67232024825 8.8454955065 12.49914499 ZT4-7 8.4260692165 8.165714513000001 8.68642392 ZT8-11 7.666246366999999 7.255022254 8.077470479999999 ZT12-15 8.057343521 7.2189535330000005 8.895733509 ZT16-19 10.749460404 8.809914115 12.689006693 ZT20-23 14.302394585 13.163608305 15.441180865