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J. Palo, MD; M. Jokelainen, MD
Dept of Neurology Univ of Helsinki Haartmaninkatu 4 00290 Helsinki, Finland

Arch Neurol. 1977;34(11):724.

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To the Editor.—

A search for clues to the etiology of amyotrophic lateral sclerosis (ALS) has revealed a clustering of the disease in the western Pacific regions, the Island of Guam, New Guinea, and the Kii Peninsula of Japan.¹ Recent epidemiological studies in Finland have shown some clustering of the cases to the southeastern

Social Class Distribution Among 421 Amyotrophic Lateral Sclerosis (ALS) Patients and the Whole Population of Finland

Social Class No. (%) of ALS Patients No. (%) of Whole Population I 44 (10) 367,783 (8) 104 (25) 1,152,003 (25) 164 (39) 2,279,530 (50) IV 99 (24) 659,776 (14) Unknown 10 (2) 139,244 (3) Total 421 (100) 4,598,336(100) counties of the country.² Based on the death certificates of 421 patients and expressed as deaths caused by ALS per 100,000 population in three-year periods,³ prevalences up to 6.81 were recorded in those counties while the mean for the whole . . . [Full Text PDF of this Article]

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