condition mean min max ZT0-3 6.094578802249999 2.3882940565 9.800863547999999 ZT4-7 0.6223215787499999 0.5845570885 0.6600860689999999 ZT8-11 0.48298736350000004 0.320594563 0.6453801640000001 ZT12-15 0.4050745355 0.2085066495 0.6016424215 ZT16-19 0.1817575845 0.1620572495 0.20145791950000003 ZT20-23 0.2248873185 0.147364758 0.302409879