condition mean min max ZT0-3 4.2136933333333335 1.5382449999999999 5.76796 ZT4-7 4.840115 4.840115 4.840115 ZT8-11 2.0946 2.0946 2.0946 ZT12-15 5.671055 5.533075 5.809035 ZT16-19 5.16753 5.16753 5.16753 ZT20-23 3.9748650000000003 3.9748650000000003 3.9748650000000003