Table 3.
Correlations between the 24-item Hamilton Depression Rating Scale (HDRS-24) and the Beck Depression Inventory (BDI) and their respective factor scores (N = 40, PET subjects only).
| BF1 | BF2 | BF3 | BDI total | ||
|---|---|---|---|---|---|
| HF1 | Pearson correlation | 0.24 | 0.40 | 0.11 | 0.33 |
| Psychic depression |
p (2-tailed) | 0.14 | 0.01 | 0.52 | 0.04 |
| % variance shared | 6% | 16% | 1% | 11% | |
| HF2 | Pearson correlation | 0.40 | −0.04 | 0.60 | 0.37 |
| Loss of motivated |
p (2-tailed) | 0.01 | 0.79 | 0.00 | 0.02 |
| % variance shared | 16% | 0% | 35% | 14% | |
| behavior | |||||
| HF3 | Pearson correlation | 0.33 | 0.24 | 0.34 | 0.36 |
| Psychosis | p (2-tailed) | 0.04 | 0.14 | 0.03 | 0.02 |
| % variance shared | 11% | 6% | 11% | 13% | |
| HF4 | Pearson correlation | −0.03 | 0.23 | 0.09 | 0.12 |
| Anxiety | p (2-tailed) | 0.86 | 0.15 | 0.57 | 0.45 |
| % variance shared | 0% | 5% | 1% | 2% | |
| HF5 | Pearson correlation | 0.14 | 0.26 | 0.25 | 0.26 |
| Sleep disturbance |
p (2-tailed) | 0.38 | 0.11 | 0.11 | 0.11 |
| % variance shared | 2% | 7% | 6% | 7% | |
| HDRS-24 | Pearson correlation | 0.41 | 0.44 | 0.50 | 0.55 |
| Total score | p (2-tailed) | 0.01 | 0.00 | 0.00 | 0.00 |
| % variance shared | 17% | 20% | 25% | 30% |
Abbreviations: HF1–5 = HDRS factor 1–5; BF1–3 = BDI factor 1–3.