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Change in disc height. (A) Percent disc height index (%DHI) was measured for 60 weeks after injection of the platelet-rich plasma releasate (PRPr) or corticosteroid (CS). The number in parentheses indicates weeks after the optional injection. Data were expressed as means ± standard error of the means (SEMs). (B) Change in disc height index (DHI) from baseline. * p < 0.05.
