condition mean min max ZT0-3 45.293526 45.293526 45.293526 ZT4-7 269.4559585 269.4559585 269.4559585 ZT8-11 212.34874200000002 212.34874200000002 212.34874200000002 ZT12-15 170.079051 170.079051 170.079051 ZT16-19 59.671302999999995 59.671302999999995 59.671302999999995 ZT20-23 26.906174 26.906174 26.906174