condition mean min max ZT0-3 34.284262 34.284262 34.284262 ZT4-7 33.292977 33.292977 33.292977 ZT8-11 48.796053 48.796053 48.796053 ZT12-15 34.932368999999994 34.932368999999994 34.932368999999994 ZT16-19 43.0989175 43.0989175 43.0989175 ZT20-23 25.205048500000004 25.205048500000004 25.205048500000004