title: Seasonal variation in the incidence of farmer's lung.
abstract: The seasonal variation in the incidence of 78 consecutive cases of farmer's lung was investigated according to a statistical method described by Roger. The cyclic trend was statistically highly significant (P less than or equal to 0.0001) and the centre of gravity of incidence appeared in the latter half of April. The reasons for the variation are discussed.
mesh_terms: D005203:Farmer's Lung / Q000453:epidemiology*; D005387:Finland; D006801:Humans; D012621:Seasons