condition mean min max ZT0-3 1202.275851 1202.275851 1202.275851 ZT4-7 1016.1699495 1016.1699495 1016.1699495 ZT8-11 840.6892339999999 840.6892339999999 840.6892339999999 ZT12-15 1079.6390055 1079.6390055 1079.6390055 ZT16-19 803.102388 803.102388 803.102388 ZT20-23 1232.540814 1232.540814 1232.540814