Table 3.
Differences in age at peak volume and surface area
| Age at peak (unweighted) | Age at peak (weighted) | Difference in age at peak (unweighted−weighted) | |
|---|---|---|---|
| Total cortical volume measures | |||
| Total cortical volume | 6.1 | 5.3 | 0.8 |
| Total cortical volume (L) | 6.3 | 5.5 | 0.8 |
| Total cortical volume (R) | 5.9 | 5.1 | 0.8 |
| Total and regional cortical surface area measures | |||
| Total surface area | 12.1 | 9.7 | 2.4 |
| Total surface area (L) | 12.1 | 9.7 | 2.4 |
| Total surface area (R) | 12.1 | 9.7 | 2.4 |
| Frontal lobe (L) | 12.6 | 10.8 | 1.8 |
| Frontal lobe (R) | 12.5 | 11.0 | 1.5 |
| Occipital lobe (L) | 13.1 | 9.0 | 4.1 |
| Occipital lobe (R) | 12.3 | 8.8 | 3.5 |
| Temporal lobe (L) | 12.3 | 10.2 | 2.1 |
| Temporal lobe (R) | 12.7 | 10.7 | 2.0 |
| Parietal lobe (L) | 9.8 | 8.6 | 1.2 |
| Parietal lobe (R) | 9.7 | 8.6 | 1.1 |
| Subcortical volume measures | |||
| Total subcortical volume | 12.1 | 9.4 | 2.7 |
| Amygdala (bilateral) | 10.7 | 6.7 | 4.0 |
| Basal ganglia (bilateral) | 11.4 | 9.0 | 2.4 |
| Hippocampus (bilateral) | 10.0 | 8.3 | 1.7 |
Left hemisphere, Right hemisphere
Note: Thickness estimates not included because best-fitting models in unweighted and weighted models were effectively linear and declining over time