"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!
Amputees can learn to control a robotic arm with their minds
28.11.2017 | University of Chicago Medical Center
The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
12.12.2017 | Physics and Astronomy
12.12.2017 | Earth Sciences
12.12.2017 | Power and Electrical Engineering