condition mean min max ZT0-3 823.001869 823.001869 823.001869 ZT4-7 706.709069 706.709069 706.709069 ZT8-11 605.4862385 605.4862385 605.4862385 ZT12-15 684.6703665 684.6703665 684.6703665 ZT16-19 633.353026 633.353026 633.353026 ZT20-23 896.6805435 896.6805435 896.6805435