They have no or mild primary dysmenorrhea.

They have moderate and sever primary dysmenorrhea.

No intervention

The Overall Stability Index (OSI) is the primary measure of dynamic postural control obtained from the balance assessment system. It reflects the standard deviation of the participant's sway from the platform's center across both the medial-lateral and anterior-posterior directions. Higher OSI values indicate greater instability and poorer balance performance. As an integrated measure of sway variability, the OSI is considered the most comprehensive indicator of overall balance ability and is commonly used to evaluate changes in postural control in response to therapeutic interventions.

The Medial-Lateral Stability Index (MLSI) quantifies the degree of side-to-side sway during balance testing. It represents the standard deviation of medial-lateral movement from the platform's center point, providing a directional measure of postural stability. Elevated MLSI scores reflect increased lateral instability, which may be associated with impaired neuromuscular control or deficits in weight-shifting ability. This variable is useful for identifying balance impairments that predominantly affect frontal plane stability.

The Anterior-Posterior Stability Index (APSI) measures front-to-back sway during dynamic balance assessment. Calculated as the standard deviation of anterior-posterior deviations from the center of the platform, the APSI provides insight into sagittal plane stability. Higher APSI values indicate greater instability and reduced capacity to control forward and backward movements. This index is important for evaluating postural control related to gait, stepping, and activities requiring controlled anterior or posterior shifts in the center of gravity.

It will be assessed using the Visual analog scale (VAS) for all females in both groups. They will score their level of pain from 1-10, with higher scores indicating more severe pain. It is valid and reliable in pain assessment