Figure 2. Complete Opioid Prescription Data for Patients With Long-term Preoperative Opioid Availability From 180 Days Through 1 Year Postoperatively.

Each row represents a unique patient. Each unique colored box represents a new opioid prescription and its daily morphine milligram equivalents, with darker red representing higher morphine milligram equivalents. Patients are clustered according to their Consortium to Study Opioid Risks and Trends (CONSORT) opioid availability classification at 1 year postoperatively. Two patients classified as having no opioid availability at 1 year had a substantial period during the 180 days after discharge in which opioids were available. These patients did not receive any prescriptions for opioids, but each had a previous prescription for tramadol hydrochloride, which provided prolonged opioid availability extending into this period.