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Figure 1.

Flow chart outlining selection criteria of articles for content analysis.

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Table 1.

Characteristics of 361 articles published in JAMA, 1990, 2000, 2010.

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Table 2.

Primary focus of 361 articles published in JAMA 1990, 2000, 2010.

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Table 3.

Statistical measures and methods in JAMA articles published in 1990, 2000, and 2010*.

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