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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Ann Surg. 2015 Jun;261(6):1184–1190. doi: 10.1097/SLA.0000000000000868

Figure 4.

Figure 4

“Predicting Risk of Complications in Older Patients with Gallstones,” PREOP-Gallstones model nomogram. To use the nomogram, a vertical line is drawn from each factor to the corresponding position on the “Points” line. Once the points are tabulated for each factor, the points are then added. A line is drawn from this position on the “Points” line to the “Emergent Visit Probability” lines to determine a patient’s 12-month and 24-month risk for developing emergent gallstone-related complications.