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For Medical Diagnoses, Doctors Still Trounce Computers

Popular symptom checkers were half as accurate in comparison study

By Dennis Thompson
HealthDay Reporter

TUESDAY, Oct. 11, 2016 (HealthDay News) -- Real doctors are still better at figuring out what's ailing someone than sophisticated symptom-checking websites and smartphone apps, according to a new study.

Physicians were twice as likely to get the right diagnosis on the first try as 23 popular symptom-checking computer programs, said senior researcher Dr. Ateev Mehrotra.

The gap was widest when it came to more complex health problems, said Mehrotra, an associate professor of health care policy and medicine at Harvard Medical School.

But across the board, "the physicians performed much better in terms of diagnostic accuracy," Mehrotra said.

The study involved 234 physicians and 23 computer symptom checkers. They were presented with 45 vignettes involving hypothetical patients and were asked to determine the illness each person likely had.

The symptom checkers included web offerings from places like the Mayo Clinic, the American Academy of Pediatrics and England's National Health Service, as well as apps for iPhone and Android smartphones, Mehrotra said.

Doctors provided the correct diagnosis right off the bat 72 percent of the time, compared with just 34 percent of the time for symptom-checking programs, researchers found.

Human doctors also outperformed computers when given the chance to provide three suspected diagnoses. The correct diagnosis was in their top-three list 84 percent of the time for doctors, and 51 percent of the time for system-checking programs.

For simpler health problems such as conjunctivitis and sinusitis, computers guessed right 40 percent of the time, compared with 65 percent of the time for physicians.

"There the differential was still better for the humans, but not as much," Mehrotra said.

But human doctors performed three times as well for very complicated health problems, getting the diagnosis right 79 percent of the time, compared with 24 percent of the time for the computer.

The findings appear in a letter published Oct. 11 in JAMA Internal Medicine.

Dr. John Meigs, president of the American Academy of Family Physicians, said he wasn't too surprised that human doctors are better at diagnosing health problems than computers.

"Physicians aren't perfect, but they have a pretty good track record," said Meigs, a family physician in Centreville, Ala. "The diagnostic technology is great to augment care, but I do not see the day where it's going to replace us."

Meigs believes these sorts of computer programs are best used to add to a doctor's judgment, rather than replace the doctor outright.

"Because computers can sort through amazing amounts of data, I think once you've got your diagnosis established, there are times where technology might be able to go through lots of guidelines and treatment protocols and help you sort that out," he said.

As they become more accurate, symptom-checking programs also may be able to help people decide whether they really need to see a doctor for the problem they're fretting over, Mehrotra said.

"There are a lot of visits in the United States where a person goes to the doc, the doc says everything is fine, pats you on the back and you walk out," he said. "If the computer for some fraction of those could tell you everything's OK, then you could stay home. You wouldn't have to schlep to the doctor, and we free up that physician's time for other stuff."

At the same time, Mehrotra won't rule out the possibility that one day computers will be able to diagnose patients as well as a doctor.

"Maybe 10 or 20 years ago, I wasn't sure that I should trust a computer to do my taxes," he said. "Now I turn to it every year."

More information

For more on symptom checkers, visit the U.S. National Institutes of Health.


SOURCES: Ateev Mehrotra, M.D., M.P.H., associate professor, health care policy and medicine, Harvard Medical School, Boston; John Meigs, M.D., president, American Academy of Family Physicians; Oct. 11, 2016, JAMA Internal Medicine

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