'Decision Fatigue' Lowers Cancer Screening Rates

The decline in screenings is believed to be the result of the cumulative burden of screening discussions earlier in the day, and doctors falling behind in their busy schedules.

Cancer screening rates drop significantly as the physician work day goes on, according to a new study   published today in JAMA Network Open.

Researchers in the Perelman School of Medicine and the Wharton School both of the University of Pennsylvania say these rates of decline may be in part due to "decision fatigue," the result of the cumulative burden of screening discussions earlier in the day, and doctors falling behind in their busy schedules.

"Our findings suggest that future interventions targeting improvements in cancer screening might focus on time of day as an important factor in influencing behaviors," Esther Hsiang, the study lead author, a Wharton Business School student, and a researcher with Penn Medicine Nudge Unit, said in remarks accompanying the study.

The study looked at data from 2014 through 2016 across 33 Pennsylvania and New Jersey primary care practices.

The researchers found that, among eligible patients, primary care doctors ordered breast cancer screening more often for patients seen in the 8 a.m. hour (64%) as compared to those with appointments at 5 p.m. (48%).

Similarly, for colon cancer screening, tests were also ordered more frequently for 8 a.m. patients (37%) compared to those coming in later in the day (23%).

Ordering rates had far-reaching effects. When looking at the entire population eligible for screenings at these practices (roughly 19,000 for breast cancer and 33,000 for colorectal cancer), the study tracked whether the patients were screened within a year of their appointment.

The data showed that the downward trend associated with the timing of the appointments carried over.

Breast cancer screening—including mammograms—stood at a 33% one-year completion rate for the entire eligible population who had their appointment in the 8 a.m. hour. But for those who had clinic visits at 5 p.m. or later, just 18% completed screenings.

For colorectal cancer, screenings such as colonoscopies, sigmoidoscopies, and fecal occult blood tests were completed by 28% of the patients with appointments in the 8 a.m. hour. That number dropped to 18% for patients who saw the doctor at 5 p.m. or later.

The study also found that there was a brief spike in screening orders for breast and colon cancers when patients saw their clinician around noon. For example, breast cancer screening orders dropped to 48.7% at 11 a.m. but increased to 56.2% around noon, before gradually falling off again. This trend held true for one-year completion rates, as well.

The study authors suggest that this may be due to lunch breaks that give clinicians and opportunity to catch up and start fresh.

A downward trend in outcomes by hour was noted in a study in 2018 examining the rates of flu vaccinations by the time of day when patients saw a clinician.

In that study, a "nudge" was built into the system that prompted doctors to accept or decline an influenza vaccine order, which helped spur an increase of vaccinations by nearly 20 percent, as compared to patients with doctors who weren’t nudged.

“Our new study adds to the growing evidence that time of day and decision fatigue impacts patient care,” said Mitesh Patel, MD, MBA, director of the Penn Medicine Nudge Unit and an assistant professor of Medicine.

"In past work, we've found that nudges in the electronic health record can be used to address these types of gaps in care, which we suspect will be the case here," Patel said. "Future research could evaluate how nudges may be implemented in order to improve cancer screening."