condition mean min max ZT0-3 12.047799999999999 12.047799999999999 12.047799999999999 ZT4-7 6.068375 6.068375 6.068375 ZT8-11 9.12524 9.12524 9.12524 ZT12-15 13.26585 13.26585 13.26585 ZT16-19 19.37805 19.37805 19.37805 ZT20-23 19.3385 19.3385 19.3385