condition mean min max ZT0-3 220.597141 220.597141 220.597141 ZT4-7 67.17914300000001 67.17914300000001 67.17914300000001 ZT8-11 89.1088685 89.1088685 89.1088685 ZT12-15 201.8967935 201.8967935 201.8967935 ZT16-19 95.09385449999999 95.09385449999999 95.09385449999999 ZT20-23 90.27049149999999 90.27049149999999 90.27049149999999