condition mean min max ZT0-3 11.657544666666668 0.6044015 33.59434 ZT4-7 13.826799999999999 13.826799999999999 13.826799999999999 ZT8-11 6.0629599999999995 6.0629599999999995 6.0629599999999995 ZT12-15 3.2745325 2.8749849999999997 3.67408 ZT16-19 0.8716600005633 0.8716600005633 0.8716600005633 ZT20-23 0.8191314999999999 0.8191314999999999 0.8191314999999999