condition mean min max ZT0-3 365.338188 365.338188 365.338188 ZT4-7 581.8330980000001 581.8330980000001 581.8330980000001 ZT8-11 579.065743 579.065743 579.065743 ZT12-15 534.9981005 534.9981005 534.9981005 ZT16-19 504.2981715 504.2981715 504.2981715 ZT20-23 517.9794529999999 517.9794529999999 517.9794529999999