Table 1.

Summary of quantitative results in this study with the cohort as a whole and stratified by site. N is the number of subjects remaining after QC in relation to initial number of subjects (N_total). The corresponding characteristics (mean ± standard deviation) include age, brain volume, WMHv and association of WMHv with age, characterized by parameter m in Eq. (1).

Site	N/Ntotal	Age (years)	Brain volume (cc)	ln(WMHv (cc))	Association ln(WMHv (cc)) ~ age (years)
All	2533	63.38 ± 14.58	1471.65 ± 150.86	1.66 ± 1.35	0.051 ± 0.001
01	335/351	64.85 ± 15.00	1465.38 ± 139.58	1.84 ± 1.27	0.047 ± 0.002
02	150/202	65.21 ± 13.49	1444.81 ± 144.42	2.06 ± 1.25	0.051 ± 0.002
03	448/452	65.06 ± 14.36	1471.24 ± 151.98	1.70 ± 1.30	0.051 ± 0.001
04	241/253	61.78 ± 13.82	1451.94 ± 144.94	1.85 ± 1.12	0.038 ± 0.001
05	59/61	42.59 ± 5.80	1451.94 ± 144.94	0.45 ± 1.09	0.065 ± 0.007
06	110/120	70.15 ± 11.10	1512.19 ± 139.58	2.30 ± 1.13	0.042 ± 0.003
07	60/64	64.60 ± 15.71	1463.68 ± 153.96	1.56 ± 1.91	0.081 ± 0.002
08	208/289	63.89 ± 12.91	1439.15 ± 140.96	1.69 ± 1.33	0.049 ± 0.002
09	159/188	52.28 ± 11.68	1514.68 ± 142.48	0.81 ± 1.54	0.071 ± 0.002
10	202/210	60.43 ± 13.63	1420.39 ± 131.28	1.55 ± 1.24	0.052 ± 0.002
11	127/148	62.71 ± 13.01	1523.09 ± 157.05	1.62 ± 1.31	0.047 ± 0.003
12	434/445	67.12 ± 14.45	1483.62 ± 152.30	1.62 ± 1.33	0.048 ± 0.001