Risk factor analysis and nomogram model construction for mortality in patients following colonic perforation surgery

Figure 1 Nomogram. A visual nomogram for predicting 30-day post-operative mortality in patients with colonic perforation. To determine the probability of death, the patient’s Acute Physiology and Chronic Health Evaluation II score, lactate level, white blood cell count, and presence (yes) or absence (no) of portal venous gas on their respective axes were located; a vertical line was drawn up to the points axis to score each variable. The points are summed, and the vertical line is dropped from the total points axis to the lower risk axis to determine the individual mortality probability. APACHE II: Acute Physiology and Chronic Health Evaluation II; WBC: White blood cell; PVG: Portal venous gas.