Table 2.

Principal component analysis on SOD1G93A mice disease-related data.

	Components (variance explained)
Variables	PC1 (67%)	PC2 (33%)
Age at peak BW (onset)	−0.617	0.787
Disease Duration	0.999	0.003
Survival	0.795	0.606

Days at peak body weight (BW), i.e. age at disease onset, disease duration and survival variables from SOD1G93A low-copy mutant mice (n = 52). A clearly bipartite two components solution was obtained, accounting for 100% of total variance. PC1 was interpreted as “disease duration/prognosis,” PC2 as “life time without disease” unrelated to duration. Data are factor loadings (in bold >|0.6|).