Study reveals lack of self-awareness among doctors when prescribing opioids: Emergency department physicians underestimated how often they prescribed opioids, but prescriptions decreased after they saw their actual data -- ScienceDailySome 65 percent of those surveyed prescribed more opioids that they thought they did. Michael and his team found participants discharged 119,428 patients and wrote 75,203 prescriptions, of which 15,124 (or about 20 percent) were for opioids over the course of the 12-month study. The researchers then monitored the doctors after they were shown their actual prescription rates. "Everyone showed an overall decrease in prescribing opioids," Michael said. "After seeing their real data, the people with inaccurate self-perceptions, on average, had 2.1 fewer opioid prescriptions per 100 patients six months later and 2.2 percent fewer prescriptions per 100 patients at 12 months."