Table 4.6.

Distribution of patients with multiple sclerosis (%) by age at onset: data from the literature

Age at onset of multiple sclerosis (years)	R. Müller 1951 n = 793	McAlpine and Compston 1952 n = 840	Leibowitz et al 1964a; 1964b n = 266	Panelius 1969 n = 146	Confavreux et al 1980 n = 349	S. Poser et al 1982b n = 1529	Confavreux et al 2000; 2003 n = 1844
<20	22	12	15	11	11	10	12
20–29	46	35	27	48	36	36	37
30–39	24	33	28	31	33	33	30
40–49	7	17	22	9	14	21	15
≥50	1	3	8	1	6		6