condition mean min max ZT0-3 1.1612665 1.0070875 1.256952 ZT4-7 1.0290599999999999 1.0290599999999999 1.0290599999999999 ZT8-11 1.55412 1.55412 1.55412 ZT12-15 4.840999999999999 4.543559999999999 5.13844 ZT16-19 2.0459449999999997 2.0459449999999997 2.0459449999999997 ZT20-23 1.580705 1.580705 1.580705