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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: J Neurol Neurosurg Psychiatry. 2015 Jan 24;86(12):1324–1330. doi: 10.1136/jnnp-2014-309421

Table 4.

Exploratory factor analysis for nine biomarkers identifying four factors with the contribution of each biomarker to that factor shown

Variables Factor 1 Factor 2 Factor 3 Factor 4
T exec   0.59   0.06 −0.11 −0.27
NAA white matter   0.63 −0.15   0.03   0.39
CHO white matter   0.61 −0.13 −0.2   0.32
CR white matter   1 −0.01   0.05 −0.07
Albumin ratio −0.09   0.91 −0.09   0.11
Log MMP-2 index −0.12 −0.68 −0.05   0.09
Log MMP-9 index −0.01 −0.04   0.99   0.03
Aβ1–42/log P-τ181 −0.01   0.09   0.03   0.81
Mean Ki   0.14   0.42   0.36 −0.11

Bold numbers show the important loadings for each factor. Note that the signs are arbitrary. T exec is T score for executive function.

Aβ42, amyloid-β1–42; CHO, choline; CR, creatine; MMP, matrix metalloproteinase; NAA, N-acetylaspartate; P-τ181, phosphorylated-τ181.