Table 2.
Sparsity of graphs as a function of the type of correlation matrix.
| Diagnostic group | Pearson correlation |
Pearson correlation (controlling for mean cortical thickness) |
Partial correlation |
|||||
|---|---|---|---|---|---|---|---|---|
| Absolute values | Pos. values | Absolute values | Pos. values | Neg. values | Absolute values | Pos. values | Neg. values | |
| Normal | 80.3% | 80.3% | 12.7% | 7.9% | 4.6% | 8.5% | 5.0% | 3.3% |
| MCI-stable | 78.0% | 77.9% | 10.5% | 6.5% | 3.7% | 14.9% | 8.9% | 6.0% |
| MCI-progressive | 87.4% | 87.4% | 20.1% | 12.0% | 8.2% | 15.8% | 9.1% | 6.8% |
| AD-Dementia | 89.5% | 89.5% | 20.3% | 11.7% | 8.6% | 22.6% | 12.9% | 9.7% |
Abbreviations: Pos. = positive; Neg. = negative.
Note: In each graph, all edges are significant using FDR correction of q < 0.05.