Fig. 6. Knee PPT changes (initial, 2nd week, and 3rd month). The line inside the boxes show the median value, the upper and lower borders of the box show the 25% and 75% percentiles, the mustaches 10% and 90% percentiles, the circles show the extreme values. TENS: transcutaneous electrical nerve stimulation, IFC: interferential current, PPT: pressure pain threshold (kg/cm2).
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