| Scale/checklist | Sample | Reliability | Validity | Sensitivity | Specificity | Change scores | ||
| Measure | Statistic | Test-retest interval | ||||||
| Post-concussion scale (20 item)38 | 200 Control | Cronbach α | 0.87 | NA | NR | NR | NR | NR |
| 76 Concussed | Spearman nonparametric | 0.55 | NR | NR | NR | NR | SEM = 4.17 | |
| Coefficient (r) | Change = 14.8 points | |||||||
| Post-concussion scale (ImPACT)-22 item22 | 1746 Control | Cronbach α | 0.88 to 0.94* | NA | NR | NR | NR | SEM = 2.66 change = +3.4 points (young men) |
| 260 Concussed | Cronbach α | 0.93 | NA | NR | NR | NR | SEM = 3.46 change = ±4.4 points (young women) | |
| SEM = 5.29 change = 6.8 points | ||||||||
| Post-concussion scale (ImPACT)-22 item‡102 | 635 Control | Cronbach α | NA | NA | Construct | NR | NR | NR |
| 115 Concussed | ||||||||
| Post-concussion scale (ImPACT)-21 item85 | 56 Control | Pearson test-retest correlation | 0.65 (composite scores) | 5.8 days | NR | NA | Sdiff = 7.17 | |
| 41 Concussed | NA | NA | PS and <72 hrs | NA | Between group effect size; d = 0.99 | 80% CI = 9.18 | ||
| Post-concussion scale (ImPACT)-21 item47 | 66 Control | NR | NR | NA | NR | 81.9% (combined with ImPACT) | 89.4% (combined with ImPACT) | NR |
| 72 Concussed | ||||||||
| Graded Symptom Scale-17 item4 | 56 Control | NR | NR | NA | NR | 0.94–0.04† | 1.00 | NR |
| 94 Concussed | ||||||||
| SCAT post-concussion symptom scale-25 item6 | NA | NR | NR | NA | Face/content | NR | NR | NR |
| Head injury scale-16 item8 21 | 279 Control | Cronbach α | 0.84 | NA | Factorial | NR | NR | NR |
| Head injury scale-9 item8 21 | 279 Control | Cronbach α | 0.78 | NA | Factorial | NR | NR | NR |
| 17 Concussed | NA | NA | NA | Construct | NA | NA | NR | |
| 16 Control | ||||||||
| Head injury scale-16 item8 21 | 1089 Control | NA | NA | NA | Factorial | NR | NR | NR |
| Head injury scale-9 item8 21 | 1089 Control | NA | NA | NA | Factorial | NR | NR | NR |
*Varies across the various samples of healthy high school and college students. †From time of injury to day-7 post-injury. ‡Pediatric population, abstract presented at 2nd international concussion in sport conference.
CI, confidence interval; NA, not applicable; NR, not reported; PS, preseason; Sdiff, standard error of difference; SEM, standard error of measurement.