Table 1.

Demographic and clinical data for patients with multiple sclerosis on prevalence day, 1 January 2013

	n	Per cent	Mean age at onset (years)	p Value
Diagnostic classification
Poser
Definite MS	493	47.6	31.7	0.97
Probable MS	112	10.8	33.0
McDonald	430	41.5	31.5
Course of disease at onset
Remitting–relapsing MS	950	91.8	30.7	0.065
Primary–progressive MS	85	8.2	43.8
Gender
Women	660	63.8	33.4	0.35
Men	375	36.2	34.3
Total	1035		31.8

MS, multiple sclerosis.