condition mean min max ZT0-3 3.0402500000000003 3.0402500000000003 3.0402500000000003 ZT4-7 3.98081 3.98081 3.98081 ZT8-11 5.14905 5.14905 5.14905 ZT12-15 3.548385 3.548385 3.548385 ZT16-19 3.5623449999999997 3.5623449999999997 3.5623449999999997 ZT20-23 2.1251499999999997 2.1251499999999997 2.1251499999999997