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A brief note on overlapping confidence intervals

Austin PC, Hux JE. J Vasc Surg. 2002; 36(1):194-5.

Clinical researchers frequently assess the statistical significance of the difference between two means by examining whether the two 95% confidence intervals overlap. The purpose of this brief communication is to illustrate that the 95% confidence intervals for two means can overlap and yet the two means can be statistically significantly different from one another at the alpha = 0.05 level.

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Keywords: Research and statistical methods