Comparison of PLM members' individual and disease characteristics with those of patients followed at the Partners MS Center.

NB. For individual variables, as some subjects had missing data, the N used for calculation of percentages was lower than the total N of respondents.注：针对单个变量，由于部分受访者存在数据缺失情况，用于计算百分比的样本量（N）低于受访对象的总样本量。