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Bentley has compared 677 persons treated by artificial pneumothorax with 3,329 treated by bed rest and other measures in the absence of collapse therapy. The average time over which artificial pneumothorax treatment was continued was 18.8 months, but of the patients alive at the end of the study the treatment had been continued over a period of approximately three years. Two hundred and sixty-six of the 677 patients treated by pneumothorax were followed for a minimum period of three years and 411 of the patients were followed for a period of five years, while the 3,329 treated without collapse therapy were followed for a period of five years. The 411 observed for five years showed a gain in the number alive of 19.8 per cent at the end of five years over those treated conservatively. Of the total 677 treated by artificial pneumothorax, in 267 the collapse was incomplete and
Artificial Pneumothorax: Experience of the London County Council. JAMA. 1937;108(20):1740. doi:10.1001/jama.1937.02780200062027