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Table 2: Corticospinal tract (CST) volumes in patients with amyotrophic lateral sclerosis (ALS) and healthy subjects
Measurement Healthy Control Subjects (n = 17) ALS Patients (n = 16)
Left (10⁻³ mm³) Right (10^-3 mm³) Affected (10⁻³ mm³) Nonaffected (10⁻³ mm³)
CST volume (mean ± SD) 10.19 ± 0.94 10.43 ± 0.96 9.18 ± 0.70^* 9.33 ± 0.64^*
* Statistically different by unpaired t-test (P < .01).

Measurement	Healthy Control Subjects (n = 17)		ALS Patients (n = 16)
Measurement	Left (10⁻³ mm³)	Right (10^-3 mm³)	Affected (10⁻³ mm³)	Nonaffected (10⁻³ mm³)
CST volume (mean ± SD)	10.19 ± 0.94	10.43 ± 0.96	9.18 ± 0.70^*	9.33 ± 0.64^*