(a).
| Distribution of SAD symptom severity | ||||||
|---|---|---|---|---|---|---|
| Group | 1, none or slight | 2, mild | 3, moderate | 4, severe | 5, very severe | |
| Before intervention | BrainPower group | 1 (2.1%) | 3 (6.4%) | 16 (34.0%) | 19 (40.4%) | 8 (17.0%) |
| Placebo group | 7 (13.7%) | 7 (13.7%) | 8 (15.7%) | 22 (43.1%) | 7 (13.7%) | |
| Total | 8 (8.2%) | 10 (10.2%) | 24 (24.5%) | 41 (41.8%) | 15 (15.3%) | |
|
| ||||||
| After intervention | BrainPower group | 4 (8.5%) | 15 (31.9%) | 21 (44.7%) | 6 (12.8%) | 1 (2.1%) |
| Placebo group | 2 (3.9%) | 17 (33.3%) | 16 (31.4%) | 15 (29.4%) | 1 (2.0%) | |
| Total | 6 (6.1%) | 32 (32.7%) | 37 (37.8%) | 21 (21.4%) | 2 (2.0%) | |