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Table 4: Correlation coefficients between CSA (GM and SC) and clinical scores at baseline and at 1 year^{^a}
Predictors At Baseline At 1 Year
ALSFRS-R Subscore MMT Arm Subscore ALSFRS-R Subscore
GMCSA R = 0.56 R = 0.40 R = 0.48
P = .004^{^b} P = .049^{^a} P = .035^{^c}
SCCSA R = 0.55 R = 0.40 R = 0.54
P = .005^{^b} P = .054 P = .017^{^c}
Note:—MMT indicates manual muscle testing.
↵a CSA was averaged across the C4–C6 vertebral levels. Clinical scores included: 1) ALSFRS-R at baseline; 2) MMT subscores at baseline; and 3) ALSFRS-R subscore at 1 year.
↵b Significant (P ≤ .01).
↵c Significant (P ≤ .05).

Predictors	At Baseline		At 1 Year
Predictors	ALSFRS-R Subscore	MMT Arm Subscore	ALSFRS-R Subscore
GMCSA	R = 0.56	R = 0.40	R = 0.48
	P = .004^{^b}	P = .049^{^a}	P = .035^{^c}
SCCSA	R = 0.55	R = 0.40	R = 0.54
	P = .005^{^b}	P = .054	P = .017^{^c}