condition mean min max ZT0-3 1.77046 1.77046 1.77046 ZT4-7 1.26152 1.26152 1.26152 ZT8-11 1.6022750000000001 1.6022750000000001 1.6022750000000001 ZT12-15 1.588955 1.588955 1.588955 ZT16-19 2.4934849999999997 2.4934849999999997 2.4934849999999997 ZT20-23 1.605005 1.605005 1.605005