condition mean min max ZT0-3 7673.406666666667 7153.27 8177.5 ZT4-7 8190.639999999999 8190.639999999999 8190.639999999999 ZT8-11 8441.21 8441.21 8441.21 ZT12-15 8310.5825 8230.265 8390.9 ZT16-19 8637.04 8637.04 8637.04 ZT20-23 7295.8150000000005 7295.8150000000005 7295.8150000000005