Table 2.
Measures of central tendency, reliability, and effect sizes for Level A neurocognitive measures
| ImPACT verbal memory | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 3154 | 87.90 (10.36) | 90 | 81 | 96 | 0.50 (0.48–0.53) | 0.05 |
| Year 2 | 88.40 (10.52) | 91 | 82 | 97 | |||
| Year 1 | 505 | 87.61 (10.78) | 90 | 81 | 96 | 0.47 (0.40–0.53) | 0.23 |
| Year 3 | 90.00 (9.93) | 93 | 84 | 99 |
| ImPACT visual memory | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 3154 | 78.24 (13.31) | 80 | 70 | 89 | 0.58 (0.55–0.60) | 0.11 |
| Year 2 | 79.65 (13.25) | 81 | 72 | 90 | |||
| Year 1 | 505 | 78.04 (13.36) | 80 | 70 | 89 | 0.47 (0.40–0.54) | 0.22 |
| Year 3 | 80.86 (12.84) | 82 | 73 | 91 |
| ImPACT visual motor speed | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 3154 | 41.78 (6.47) | 42.12 | 37.17 | 47.02 | 0.72 (0.70–0.74) | 0.13 |
| Year 2 | 42.64 (6.42) | 43.29 | 38.2 | 47.75 | |||
| Year 1 | 505 | 42.11 (6.41) | 42.4 | 37.6 | 47.08 | 0.66 (0.61–0.71) | 0.22 |
| Year 3 | 43.47 (5.98) | 44.03 | 39.47 | 48.22 |
| ImPACT reaction time | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 3149 | 0.5867 (0.09) | 0.57 | 0.53 | 0.63 | 0.47 (0.44–0.50) | 0.05 |
| Year 2 | 0.5828 (0.08) | 0.57 | 0.53 | 0.62 | |||
| Year 1 | 503 | 0.598 (0.11) | 0.57 | 0.53 | 0.64 | 0.34 (0.26–0.42) | 0.14 |
| Year 3 | 0.585 (0.08) | 0.58 | 0.53 | 0.63 |
| CCAT composite processing speeda | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 447 | 102.76 (6.11) | 103.8 | 100.1 | 106.5 | 0.49 (0.41–0.55) | 0.09 |
| Year 2 | 103.31 (5.86) | 104.2 | 100.9 | 107 |
| CCAT composite attentiona | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 448 | 106.39 (4.71) | 107 | 103.8 | 109.82 | 0.56 (0.49–0.62) | 0.01 |
| Year 2 | 106.36 (5.24) | 106.9 | 103.3 | 109.82 |
| CCAT composite learninga | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 446 | 104.64 (10.25) | 103.7 | 98.2 | 111.2 | 0.54 (0.47–0.6) | 0.28 |
| Year 2 | 107.46 (10.12) | 107.3 | 100.73 | 115.3 |
| CCAT working memory speed: speeda | n | Mean (SD) | Median | 1st quartile | 3rd quartile | ICC (lower, upper bound) | Cohen’s d |
|---|---|---|---|---|---|---|---|
| Year 1 | 448 | 103.52 (6.15) | 104 | 99.38 | 107.8 | 0.59 (0.53–0.65) | 0.15 |
| Year 2 | 104.47 (6.1) | 104.5 | 100.57 | 108.5 |
CCAT computerized concussion assessment tool, ICC intraclass correlation coefficient, ImPACT immediate post-concussion assessment and cognitive test, SD standard deviation
aIndicates insufficient sample size to complete the year 1–3 estimates