Table 2.
Reading Task Outcomes with the Liquid Crystal Display and Non-Liquid Crystal Display Screens
| A. Wilcoxon Signed Rank Test for the Liquid Crystal Display Screen Performance | |||||
|---|---|---|---|---|---|
| Outcome | LCD screen (Pre) | LCD screen (Post) | LCD screen (delta) | Sum of signed ranks (W) | p value |
| Total symptom severity (SCAT3 total symptom score) | 30.2 (25.8) | 42.7 (20.1) | 12.5 (2.5) | 390 | <0.01 |
| Number of SCAT3 symptoms produced | 12.1 (6.3) | 14.1 (6.5) | 2.0 (0.5) | 257 | <0.01 |
| B. Wilcoxon Signed Rank Test for the non- Liquid Crystal Display Screen Performance | |||||
|---|---|---|---|---|---|
| Outcome | non-LCD screen (pre) | non-LCD screen (post) | non-LCD screen (delta) | Sum of signed ranks (W) | p value |
| Total symptom severity (SCAT3 total symptom score) | 30.0 (21.1) | 33.1 (21.0) | 3.0 (1.5) | 138 | 0.063 |
| Number of SCAT3 symptoms produced | 12.9 (5.8) | 13.2 (5.9) | 0.3 (0.4) | 41 | 0.49 |
| C. Wilcoxon Matched-Pairs Signed Rank Test Comparing the Two Screens | |||||
|---|---|---|---|---|---|
| Outcome | LCD minus non-LCD (pre) | LCD minus non-LCD (post) | LCD minus non-LCD (delta) | Sum of Signed Ranks (W) | p value |
| Total symptom severity (SCAT3 total symptom score) | 0.2 (24.3) | 9.6 (20.3) | 5 | 315 | < 0.01 |
| Number of SCAT3 symptoms produced | −0.8 (5.9) | 0.9 (6.2) | 1 | 148 | <0.01 |
| Number of questions answered correctly | 1 | 95 | 0.26 | ||
| Number of questions answered | 3 | 127 | 0.11 | ||
| % of questions answered correctly | 0.5 | 25 | 0.77 | ||
| Number of words read | 261 | 146 | 0.098 | ||
| Time of reading (seconds) | −48 | 147 | 0.009 | ||
LCD, liquid crystal display; SCAT3, Sports Concussion Assessment Tool 3.