4 Age (in years) Education (in years) WAIS-III information (SS) GCS score in ED Days tested after Injury Duration of loss of consciousness (minutes) Duration of posttraumatic amnesia (minutes) Duration of retrograde amnesia (minutes) Number of days to return to work Gender Male Mechanism of injury MVA Other bodily injuries CT: day of injury Abnormal Rehabilitation Research and Practice Table 2: Demographic and injury severity characteristics. Uncomplicated MTBI M SD 30.8 9.0 13.1 2.3 10.9 2.4 14.9 0.3 26.0 2.9 Complicated MTBI M SD 29.2 10.9 12.9 2.3 10.4 1.4 14.9 0.3 25.4 3.0 0.6 333.0 9.2 12.9 f 17 15 9 0 1.5 448.2 23.6 18.8 % 50.0 44.1 26.5 0 1.0 366.7 21.5 58.0 f 7 5 4 8 1.5 420.8 66.6 83.8 % 53.8 38.5 30.8 61.5 p 0.601 0.859 0.492 0.693 0.523 0.514 0.822 0.354 0.002 χ2 0.813 0.726 0.768 — d .17 .06 .23 .13 .21 .25 .08 .34 1.2 — — — — MRI: 3 weeks after Abnormal 0 0 12 92.3 — — Not available 0 0 1 7.7 Note: N = 47 (uncomplicated MTBI, n = 34; complicated MTBI, n = 13). Cohen’s eﬀect size (d): small (.20), medium (.50), large (.80). CT= computed tomography; MRI: magnetic resonance imaging; GCS: Glasgow Coma Scale; MTBI: mild traumatic brain injury; MVA: motor vehicle accident. A Mann- Whitney U test was used for the number of days to return to work comparison. Table 3: Descriptive statistics (raw scores) and eﬀect sizes: self-report and neurocognitive tests. Uncomplicated MTBI M SD Complicated MTBI M SD p d Self-report Measures BDI-II total 7.6 6.7 4.5 4.0 .130 .52 RPSQ total 11.6 11.8 7.2 6.2 .358 .43 Barrow Fatigue Scale 16.4 15.3 13.0 9.7 .464 .25 Neurocognitive Tests RAVLT total 56.9 7.8 60.2 10.1 .237 .39 RAVLT delay 11.1 2.8 12.4 2.6 .159 .47 RCFT copy 35.7 0.7 35.6 0.8 .792 .09 RCFT Immediate 25.4 5.9 23.8 5.2 .402 .28 Phonemic Fluency total 38.7 9.4 39.8 13.4 .766 .10 Animal Naming total 25.1 6.4 22.5 5.0 .194 .43 Trails A (in seconds) 27.3 9.5 28.5 8.7 .685 .13 Trails B (in seconds) 62.5 24.8 57.5 13.3 .495 .23 Stroop Color-Word 42.1 8.2 45.9 7.2 .157 .47 Note: N = 47 (uncomplicated MTBI, n = 34; complicated MTBI, n = 13); Cohen’s eﬀect size (d): small (.20), medium (.50), large (.80). BDI-II: Beck Depression Inventory-Second Edition; RPSQ: Rivermead Postconcussion Scale; RCFT: Rey Complex Figure Test; RAVLT:Rey Auditory Verbal Learning Test; MTBI:mild traumatic brain injury.