condition mean min max ZT0-3 20.571376467500002 20.29523514 20.847517795 ZT4-7 22.739742803333336 22.295992376666668 23.18349323 ZT8-11 28.490898405000003 26.99165894 29.99013787 ZT12-15 30.929003285 29.961408393333333 31.896598176666668 ZT16-19 28.996515561666666 27.938081229999998 30.054949893333333 ZT20-23 24.35057336 23.035376539999998 25.66577018