The Following Two Questions Require Interpretation of the Graph

The following two questions require interpretation of the graph below:

-In 2007,Swedish researchers published results from a study in which they followed about 2000 obese patients who had undergone weight-loss surgery-either gastric bypass or surgical banding-over 15 years and compared them with about 2000 similarly obese people who didn't have surgery but who were counseled in diet and exercise.One goal of the study was to determine whether bariatric surgery saved lives as a consequence of reducing patients' weights.This graph illustrates some of their results.Based on these results and what you know about the pros and cons of bariatric surgery,would you recommend it as a good treatment for morbid obesity? Explain.