Table 3.
Correlations between cognitive tests and brain volumes corrected for ICA
| WBV | (ICV-WBV)/ICV | WBV corr for ICA | RFL corr for ICA | LFL corr for ICA | RTL corr for ICA | LTL corr for ICA | RAHC corr for ICA | LAHC corr for ICA | |
| NART | .23* | .01 | -.00 | -.01 | -.13 | -.02 | -.00 | .08 | .14 |
| RSPM | .27** | -.11 | .11 | .05 | -.09 | .17 | .09 | .01 | .03 |
| MHT | .25* | -.05 | .05 | .11 | -.06 | .15 | .04 | .03 | .06 |
| VF | .15 | -.07 | .07 | .03 | -.02 | .10 | .10 | .17 | .18 |
| LM | -.18 | .22* | -.22* | -.01 | -.09 | -.19 | -.20* | -.08 | -.04 |
| g | .21* | -.03 | .03 | .07 | -.09 | .11 | .03 | .05 | .08 |
| g corr for NART | .11 | -.04 | .04 | .09 | -.02 | .14 | .04 | .01 | .01 |
* P < .05 ** P < .01
Partial correlation, corrected for sex (df = 96) WBV: whole brain volume, ICA: intracranial area, CCA: corpus callosum area, VV: ventricular volume, RFL: right frontal lobe volume, LFL: left frontal lobe volume, RTL: right temporal lobe volume, LTLV: left temporal lobe volume, RAHC: right amygdalo-hippocampal complex volume, LAHC: left amygdalo-hippocampal complex volume
NART: National Adult Reading Test, RSPM: Raven's Standard Progressive Matrices, MHT: Moray House Test, VF: Verbal Fluency, LM: Logical Memory
g: general cognitive factor (The first unrotated principal component of MHT, RSPM, VF and LM, accounting for 51.9% of the total variance: see text.)
g corr for NART: estimate of cognitive change (see text)