Table 1.

Clinical features of all and unrelated patients in 87 sibpairs concordant for MS

All patientsUnrelated patients
nMean ± SEMRangenMean ± SEMRange
SEM = standard error of the mean; EDSS = Expanded Disability Status Scale; PI = progression index.
Age at onset, y17728.70 ± 0.6010–538729.60 ± 0.8613–53
EDSS score1773.73 ± 0.190.0–9.5873.44 ± 0.280.0–9.5
Disease duration, y17715.30 ± 0.761–458715.05 ± 1.101–45
PI1220.28 ± 0.020.0–1.4610.27 ± 0.030.0–1.2