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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 | 4 (8.5%) | 43 (91.5%) | 19 (40.4%) | 28 (59.6%) | 0.001 |
| Placebo group | 14 (27.5%) | 37 (72.5%) | 19 (37.3%) | 32 (62.7%) | 0.302 |
| Pearson χ 2 | 5.852 | 0.104 | |||
| P | 0.016 | 0.748 | |||
