Table 3.

Dependency of compartment volumes and ratios on subject and protocol parameters.

	icv (ml)	brv (ml)	gmv (ml)	wmv (ml)	brr (%)	gwr (%)
Sample mean	1616.0	1195.3	555.4	604.7	71.5	93.9
Age (years)	n.s	−3.48	−1.21	−2.27	−0.170	0.150
Gender (f–m)	142.3	106.0	41.3	65.0	n.s	−3.45
Group (AD-MCI)	n.s	18.7	13.3	n.s	0.856	1.33
Group (AD-Normal)	n.s	38.2	30.8	n.s	2.16	4.29
Body weight (kg)	2.78	1.64	0.802	0.888	−0.015	n.s
Field strength (T)	n.s	n.s	30.5	−24.0	0.820	9.89
WM/GM contrast ratio	n.s	−406.0	−111.4	−324.1	−27.5	32.8
Exp. variance (%)	44.2	48.0	48.1	59.9	55.0	68.6

Data in the first line are grand means in the sample, and may be used to relate to the regression coefficients in the subsequent lines (entries n.s. denote insignificant coefficients). Entries for categorial factors (gender, group) are differences “from-to”, e.g., males have an ICV that is 142.3 ml larger.