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Effect of postural change on RMSSD in adolescent concussion, separated by sex. Values are reported as mean. *Significantly different from control < 0.05. There was no group interaction between concussed and controls (P = 0.1). A group × sex × posture interaction was identified (P = 0.04). A measure of simple effects revealed a reduction of RMSSD in the female seated posture, compared with controls.
