<prompt> Z score measures the bone mineral density compred to -Age, Race and sex matched individualsRace and sex matched individualsSex matched individualsNone of the above  <response>: A Z-score compares your bone density to the average values for a person of your same age and gender. A low Z-score below -2.0 is a warning sign that you have lessbone mass andor may be losingbone more rapidly than expected for someone your age. Ref essential ohopaedic maheshwari and mhaskar 9TH ED 