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Example 1.4

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In the article “Hospitalization before and after gastric bypass surgery” published in the Journal of the American Medical Association (Zingmond et al., 2005), the authors reported the results of a retrospective research study designed to investigate the amount of time spent in a hospital 1–3 years after an individual receives a Roux-en-Y gastric bypass (RYGB). This study consisted of n=60,077 patients who underwent RYGB from 1995 to 2004 in California.

Applied Biostatistics for the Health Sciences

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