Figure 3. Percent of MS patients with cognitive impairment by disease duration.

The percent of patients with impairment in GCS at a cutoff of 85 (1SD below the normalized mean, white bars) and at a cutoff of 70 (2SD below the normalized mean, black bars) is presented by disease duration. The dashed bars represent the percent of patients with GCS ≥85. N = number of patients; *p≤0.005; **p<0.001; ***p<0.05.