Group mean (SE)
| Group | Day 1 mean (SE) | Day 2 mean (SE) | Mean difference between days | SE for difference | 95% Confidence interval for difference | |
|---|---|---|---|---|---|---|
| Lower bound | Upper bound | |||||
| Approximate entropy values for medial-lateral (ML) centre of pressure time series in athletes without postural instability after concussion (n = 27) and in healthy subjects (n = 30) tested on separate occasions. Athletes were tested at preseason (day 1) and within 48 h after injury (day 2). | ||||||
| Difference scores reflect comparisons across days and were significant for athletes with concussion (p = 0.02). Negative differences indicate a decline in ApEn values from day 1 to day 2. SE, standard error. | ||||||
| Concussion | 1.25 (0.06) | 1.06 (0.06) | −0.19 | 0.05 | −0.29 | −0.10 |
| Healthy | 0.86 (0.06) | 0.83 (0.06) | −0.03 | 0.05 | −0.12 | 0.07 |