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Figure 3. Associations among outcome variables: Posttraumatic Stress Disorder Checklist-Military Version (PCL-M) scores, Montreal Cognitive Assessment (MOCA) scores, Epworth Sleepiness Scale (ESS) scores, headache pain intensity (PAIN), and headache frequency (Freq). Arrows indicate positive (+) or negative (–) associations. OLF = olfaction. Ruff RL, Riechers RG 2nd, Wang X-F, Piero T, Ruff SS. For veterans with mild traumatic brain injury, improved posttraumatic stress disorder severity and sleep correlated with symptomatic improvement. J Rehabil Res Dev. 2012;49(9):1305–20.http://dx.doi.org/10.1682/JRRD.2011.12.0251