Figure 2

Association of the study factors with postoperative complications. (A to E) Kaplan-Meier (K-M) plots showing the time to development of postoperative complication based on five significant study factors. The significance values (P) was estimated using logrank test. The median time to a postoperative complication across the two categories of each predictor is shown inside each K-M plot. The colors used in the plots correspond to the colors used figure 1A and 1C. The remaining K-M plots are shown in part A of the Additional file. (F) Multiple regression analyses assessing the association of the study factors with three outcomes related to postoperative complications – risk of developing complication (left), rate of developing complication (center) and number of complications (right). For each of these outcomes, we used appropriate stepwise multiple regression models (indicated at the bottom and described in Methods section). The bars represent the risk estimate and the error bars represent the 95% confidence interval. The numbers opposite the bars are significance values obtained from the respective regression analyses. The full results of these models are given in part B of the Additional File 1