| Title |
Etiology of Inattention and Hyperactivity/Impulsivity in a Community Sample of Twins with Learning Difficulties
|
|---|---|
| Published in |
Research on Child and Adolescent Psychopathology, April 2000
|
| DOI | 10.1023/a:1005170730653 |
| Pubmed ID | |
| Authors |
Erik G. Willcutt, Bruce F. Pennington, John C. DeFries |
| Abstract |
A community sample of 373 8 to 18 year-old twin pairs in which at least one twin in each pair exhibited a history of learning difficulties was utilized to examine the etiology of inattention and hyperactivity/impulsivity (hyp/imp). Symptoms of attention-deficit/hyperactivity disorder (ADHD) were assessed by the DSM-III Diagnostic Interview for Children and Adolescents. Inattention and hyp/imp composite scores were created based on results of a factor analysis. Results indicated that extreme ADHD scores were almost entirely attributable to genetic influences across several increasingly extreme diagnostic cutoff scores. Extreme inattention scores were also highly heritable whether or not the proband exhibited extreme hyp/imp. In contrast, the heritability of extreme hyp/imp increased as a linear function of the number of inattention symptoms exhibited by the proband. This finding suggests that extreme hyp/imp may be attributable to different etiological influences in individuals with and without extreme inattention. If this result can be replicated in other samples, it would provide evidence that the hyp/imp symptoms exhibited by individuals with Combined Type ADHD and Predominantly Hyp/Imp Type ADHD may be attributable to different etiological influences. |
Mendeley readers
The data shown below were compiled from readership statistics for 62 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 2 | 3% |
| Australia | 1 | 2% |
| Netherlands | 1 | 2% |
| Argentina | 1 | 2% |
| Canada | 1 | 2% |
| Unknown | 56 | 90% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Ph. D. Student | 16 | 26% |
| Professor > Associate Professor | 10 | 16% |
| Researcher | 8 | 13% |
| Student > Doctoral Student | 7 | 11% |
| Professor | 4 | 6% |
| Other | 10 | 16% |
| Unknown | 7 | 11% |
| Readers by discipline | Count | As % |
|---|---|---|
| Psychology | 28 | 45% |
| Agricultural and Biological Sciences | 6 | 10% |
| Medicine and Dentistry | 5 | 8% |
| Neuroscience | 3 | 5% |
| Arts and Humanities | 3 | 5% |
| Other | 11 | 18% |
| Unknown | 6 | 10% |
Attention Score in Context
This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 01 January 2002.
All research outputs
#8,534,976
of 25,374,647 outputs
Outputs from Research on Child and Adolescent Psychopathology
#883
of 2,047 outputs
Outputs of similar age
#13,853
of 40,972 outputs
Outputs of similar age from Research on Child and Adolescent Psychopathology
#3
of 5 outputs
Altmetric has tracked 25,374,647 research outputs across all sources so far. This one is in the 43rd percentile – i.e., 43% of other outputs scored the same or lower than it.
So far Altmetric has tracked 2,047 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 9.5. This one is in the 46th percentile – i.e., 46% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 40,972 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 9th percentile – i.e., 9% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 5 others from the same source and published within six weeks on either side of this one. This one has scored higher than 2 of them.