Social class migration and chronic bronchitis. A study of male hospital patients in the London area.

Morbidity studies by Logan (1960) have also shown a similar, though less steep, social class gradient. These class differences are generally thought to be due to adverse factors associated with life in the lower social classes (Registrar General, 1938, 1958b; Vernon, 1939; Goodman, Lane, and Rampling 1953; Pemberton, 1953; Lane, 1954; Fletcher, 1956; Stuart-Harris and Hanley, 1957). It is also possible that a drift down the social class scale of those disabled by bronchitis might contribute to the gradient in men, particularly the excess in Social Class V. A pilot inquiry by Public Health students at the London School of Hygiene and