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| Treatment group | Before intervention | After intervention | P value of McNemar's test | ||
|---|---|---|---|---|---|
| No or slight | Severe | No or slight | Severe | ||
| BrainPower group | 3 (6.4%) | 44 (93.6%) | 16 (34.0%) | 31 (66.0%) | 0.001 |
| Placebo group | 12 (23.5%) | 39 (76.5%) | 14 (27.5%) | 37 (72.5%) | 0.791 |
| Pearson χ 2 | 5.547 | 0.5 | |||
| P | 0.019 | 0.479 | |||
