Table 3.
Parameter Estimates from the Growth Curve Model Examining Group Differences in Keeptrack Performance
| Parameter | Estimates | t value | p value |
|---|---|---|---|
| Hit percentage | |||
| Intercept | 71.0441 | 12.56 | <0.0001 |
| RPQ_low vs. TD | −8.2255 | −2.05 | 0.0419 |
| RPQ_high vs. TD | −9.9248 | −2.58 | 0.0104 |
| OI vs. TD | −11.1839 | −3.30 | 0.0011 |
| Age at baseline | .5141 | 2.13 | 0.0340 |
| SCI | 2.5447 | 1.63 | 0.1050 |
| Interval (linear slope) | 0.1100 | 5.24 | <0.0001 |
| Interval2 (quadratic) | −.00075 | −1.87 | 0.0627 |
| CC category percentage | |||
| Intercept | 96.2942 | 76.52 | <0.0001 |
| RPQ low vs. TD | −7.1545 | −4.03 | 0.0001 |
| RPQ high vs. TD | −4.9167 | −2.90 | 0.0047 |
| OI vs. TD | −4.6198 | −3.07 | 0.0028 |
| SCI | .9628 | 1.52 | 0.1312 |
| Interval (Slope) | .04876 | 2.76 | 0.0070 |
| Group*slope (RPQ low vs. TD) | .06023 | 2.89 | 0.0048 |
| Group*slope (RPQ high vs. TD) | −.00867 | −.42 | 0.6775 |
| Group*slope (OI vs. TD) | .01630 | .90 | 0.3713 |
| Interval2 (quadratic) | −.00071 | −3.23 | 0.0017 |
RPQ, Rivermead Post-Concussive Symptom Questionnaire; TD, typically developing; OI, orthopedic injuries; SCI, Socioeconomic Composite Index; CC, Categories Correct.