condition mean min max ZT0-3 68.085149 68.085149 68.085149 ZT4-7 81.7392295 81.7392295 81.7392295 ZT8-11 85.94990899999999 85.94990899999999 85.94990899999999 ZT12-15 50.666971000000004 50.666971000000004 50.666971000000004 ZT16-19 46.002144 46.002144 46.002144 ZT20-23 45.635965 45.635965 45.635965