condition mean min max ZT0-3 201.234699 201.234699 201.234699 ZT4-7 144.140687 144.140687 144.140687 ZT8-11 156.1979105 156.1979105 156.1979105 ZT12-15 160.141186 160.141186 160.141186 ZT16-19 203.4538285 203.4538285 203.4538285 ZT20-23 249.576477 249.576477 249.576477