"The question we asked was whether children who are relatively young compared to their classroom peers were more likely to be diagnosed with ADHD," says Dr. Melinda Morrill, a research assistant professor of economics at NC State and co-author of a paper describing the study. "To answer the question, we looked at children born shortly before the kindergarten eligibility cutoff date and children born shortly after the cutoff date and compared the rates of ADHD diagnosis and treatment."
The researchers figured that children born just a few days apart should have the same underlying risk of having ADHD. So finding a significant difference in diagnosis rates between children born only a few days apart is strong evidence of medically inappropriate diagnosis.
Morrill explains that the study shows that children born just after the kindergarten cutoff date were 25 percent less likely to be diagnosed as having ADHD than children born just before the cutoff date. "This indicates that there are children who are diagnosed (or not) because of something other than underlying biological or medical reasons.
"We believe that younger children may be mistakenly diagnosed as having ADHD, when in fact they are simply less mature," Morrill says.
Morrill stresses that "we are not downplaying the existence or significance of ADHD in children. What our research shows is that similar students have significantly different diagnosis rates depending on when their birthday falls in relation to the school year."
For the study, the researchers examined data from two national health surveys and a national private health insurance claims database to evaluate rates of ADHD diagnosis and treatment in children. The data sources covered different time periods ranging from 1996 to 2006.
The paper, "Measuring Inappropriate Medical Diagnosis and Treatment in Survey Data: The Case of ADHD among School-Age Children," was co-authored by Morrill, Dr. William N. Evans of the University of Notre Dame, and Stephen T. Parente of the University of Minnesota. The paper is being published in a forthcoming issue of the Journal of Health Economics, in conjunction with a related paper from Michigan State University that arrives at similar conclusions as the result of a separate study.
Matt Shipman | EurekAlert!
Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)
The personality factor: How to foster the sharing of research data
06.09.2017 | ZBW – Leibniz-Informationszentrum Wirtschaft
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
17.10.2017 | Life Sciences
17.10.2017 | Life Sciences
17.10.2017 | Earth Sciences