PCORnet Bariatric Study

Providing real-world evidence to help make informed decisions about bariatric surgery


Welcome to the PCORnet Bariatric Study (PBS) website. PBS was one of the first studies to conduct comparative effectiveness research that used data, engagement, and governance infrastructure from PCORnet, the National Patient-Centered Clinical Research Network.

We, and other PCORnet partners, developed the idea for this study as part of the PCORnet Obesity Task Force during 2014. After review by the standing Advisory Panel on Disparities at PCORI (Patient-Centered Outcomes Research Institute), the PCORI Board of Governors approved a call for proposals on the safety and effectiveness of bariatric surgery in January 2015.

Our goals

Our goals were to compare the health benefits and safety associated with the 3 main methods of bariatric (also called weight loss) surgery. We sought to provide accurate estimates of the 1-, 3-, and 5-year benefits and risks of having one of the following surgeries:

  • Roux-en-y gastric bypass (RYGB)
  • Adjustable gastric banding (AGB)
  • Sleeve gastrectomy (SG)

We focused on the following health outcomes, which have been shown to be most important to adults and adolescents who are affected by severe obesity:

  • Weight loss
  • Improvement in diabetes
  • Risk of adverse events

Our ultimate goal was to provide patients and their health care providers the information they need to choose which surgery, if any, is best for them.

Our findings

Read about the published findings from our study.

The PCORnet Bariatric Study is funded through a Patient-Centered Outcomes Research Institute (PCORI) Award (#OBS-1505-30683).

This website is solely the responsibility of the author(s) and does not necessarily represent the views of the other organizations participating in or collaborating with PCORnet® or of the Patient-Centered Outcomes Research Institute (PCORI).

We are part of the National Patient-Centered Clinical Research Network (PCORnet)

More information

Find more information about the study cohort and the health outcomes we are interested in on clinicaltrials.gov.

Learn more about the bariatric surgery procedures we are studying.


Contact: Jane Anau
Research Project Manager