Table 4:

Observed SDs of the relative changes in BPF at baseline and at 1, 2, and 4 years after inclusion^{^a}

	Baseline (%)	1 Year (%)	2 Years (%)	4 Years (%)
Uncorrected	0.508	0.526	0.454	0.687
Corr. for brain R₁	0.362 (28.8%)	0.506 (3.7%)	0.327 (28.1%)	0.599 (12.8%)
Corr. for brain PD	0.385 (24.2%)	0.500 (4.9%)	0.303 (33.3%)	0.567 (17.4%)
Corr. for GM R₂	0.506 (0.4%)	0.465 (11.5%)	0.297 (34.7%)	0.561 (16.2%)
Corr. for GM PD	0.481 (5.3%)	0.539 (−2.4%)	0.398 (12.5%)	0.673 (1.9%)
Corr. for WM R₁	0.343 (32.6%)	0.463 (12.0%)	0.349 (23.2%)	0.568 (17.3%)
Corr. for WM PD	0.399 (21.5%)	0.474 (9.8%)	0.326 (28.3%)	0.492 (28.3%)

Note:—Corr. indicates corrected.
↵a When BPF is corrected for average R₁, R₂, or PD values for brain, GM, or WM, the SDs of the observations decrease. The percentage reduction is given in parentheses. Corrections were only included when a high significance was found in Table 2.