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Editor's Correspondence
February 12, 2001

Lack of Objectivity in the Debate Concerning Third-Generation Oral Contraceptives and Venous Thrombosis—Reply

Arch Intern Med. 2001;161(3):484-485. doi:

In reply

The phenomenon that Dr Egermayer so aptly describes is usually called "consistency" and is one of the criteria of causality of A. B. Hill.1 The consistency of study results on venous thrombosis and third-generation oral contraceptives has been uniform for about a dozen studies now—at least for studies without a conflict of interest with the manufacturers of these contraceptives, as was described in a recent editorial in the British Medical Journal.2

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