condition mean min max ZT0-3 14.03966486925 11.1404787785 16.93885096 ZT4-7 5.19061823675 4.7042004109999995 5.6770360625 ZT8-11 6.124075578499999 4.88521713 7.362934027 ZT12-15 7.71411948425 7.429244903 7.9989940655 ZT16-19 13.43538220075 11.2181480665 15.652616335000001 ZT20-23 15.6775064475 15.17693598 16.178076915000002