the difference in minimum head height that occurs during RF mid stance compared to during LF mid stance. Ref range: -6.0 to +6.0 mm 

• Measured in mm and reported as a mean value of all strides. 
• Diff Min Head determines side of asymmetry (positive value = RF, negative value = LF). 
• Diff Min Head = Min height of head during RF mid-stance minus (-) min height of head during LF mid-stance.