Table 2:
Comparison of demographic and clinical characteristics of patients with mTBI with and without PTMs
| + PTM | − PTM | P Valuea | |
|---|---|---|---|
| Mean age (range) (yr) | 17.6 (10–38) | 19.7 (12–47) | .26 |
| No. of males | 39 (67%) | 12 (71%) | 1.00 |
| Median time to presentation (range) (day) | 22 (2–506) | 24 (1–261) | .79 |
| Prior concussion (No.) | 24 (41%) | 8 (47%) | .56 |
| Sports injury (No.) | 34 (59%) | 8 (47%) | .42 |
| Mean ImPACTb Total Symptom Score (percentile) (range) | 36.1 (1–97) | 20.8 (1–74) | .01 |
| Mean Verbal Memory Score (percentile) (range) | 30.2 (1–99) | 37.5 (7–92) | .20 |
| Mean Visual Memory Score (percentile) (range) | 28.1 (1–97) | 36.5 (1–88) | .13 |
| Mean reaction time (percentile) (range) | 34.6 (1–95) | 43.1 (1–94) | .18 |
| Mean processing speed (percentile) (range) | 33.5 (1–98) | 47.7 (1–94) | .05 |
| Median time to recovery (range) (week) | 51.9 (1–252) | 39.4 (3–194) | .50 |
a
P values were 2-tailed and calculated with the use of an unpaired t test for continuous variables and a Fisher exact test for categoric variables.
b
ImPACT indicates Immediate Post-Concussion Assessment and Cognitive Test. Scores are percentiles determined by normative data from baseline testing of >17,000 athletes as part of their presport participation with percentile information accounting for both sex and age.