Читать книгу Applied Biostatistics for the Health Sciences - Richard J. Rossi - Страница 24
Example 1.4
ОглавлениеIn 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.