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Previous Volume 332:888-890 March 30, 1995 Number 13 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: It is informative to contrast the results of the two clinical trials comparing bypass surgery and angioplasty (Oct. 20 issue)^1,2 with the results of a previous observational study.³ Neither clinical trial found any difference in mortality rates at one year between coronary bypass surgery and angioplasty. However, the observational study found that the patients who underwent coronary bypass surgery had a higher mortality rate, even after adjustment for risk factors. The difference was greatest for low-risk patients.

Differences between the studies may have been due to chance, but there are also potential structural reasons for the differences. . . . [Full Text of this Article]

References

This article has been cited by other articles:

• Benson, K., Hartz, A. J. (2000). A Comparison of Observational Studies and Randomized, Controlled Trials. NEJM 342: 1878-1886 [Abstract] [Full Text]