condition mean min max ZT0-3 0.481001 0.481001 0.481001 ZT4-7 0.15468500000000002 0.15468500000000002 0.15468500000000002 ZT8-11 0.3782765 0.3782765 0.3782765 ZT12-15 1.378095 1.378095 1.378095 ZT16-19 2.0262000000000002 2.0262000000000002 2.0262000000000002 ZT20-23 1.1311900000000001 1.1311900000000001 1.1311900000000001