condition mean min max ZT0-3 5.640689999999999 4.290895 6.990485 ZT4-7 2.2485150000000003 2.2485150000000003 2.2485150000000003 ZT8-11 1.6233650000000002 1.6233650000000002 1.6233650000000002 ZT12-15 0 0 0 ZT16-19 3.34742 3.34742 3.34742 ZT20-23 3.2248099999999997 3.2248099999999997 3.2248099999999997