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 = .004b	P = .049a	P = .035c
SCCSA	R = 0.55	R = 0.40	R = 0.54
	P = .005b	P = .054	P = .017c

Note:—MMT indicates manual muscle testing.

^aCSA 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.

^bSignificant (P ≤ .01).

^cSignificant (P ≤ .05).