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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Surgery. 2012 Sep;152(3):355–362. doi: 10.1016/j.surg.2012.06.009

Figure 1. Quantile-quantile plot of body mass index for cases and controls.

Figure 1

The solid line indicates x = y, and dashed lines indicate BMI = 20, BMI = 30 and BMI = 35. After ordering the cases and controls, adjacent pairs of controls were averaged to allow a one-to-one plot of cases versus controls. As can be seen, patients with a BMI greater than 35 kg/m2 were overrepresented among cases of readmission as compared to controls.