Table 3.

Logistic modeling^a

	Parameter	P	R-square (%)	AUC
Log distal PEC	PEC	0.006	9.0	69.8
PC1	PC1	0.003	10.6	77.6
PC1-PC2	PC1	0.0009	17.0	77.8
	PC2	0.02
PC1-PC3	PC1	0.0006	17.8	78.3
	PC2	0.016
	PC3	0.42

^aA composite measure of the EoEHSS scores was generated using PCA. Model fit was compared using R-square and AUC. PC1 included EI, BZH, DIS, EA, and SEA proximal and distal grade and stage scores weighted similarly. PC2 included negative weights for DIS and positive weights for SL and EA. PC3 included negative weights for SEA and SL and positive weights for EI.