Is overactivity a core feature in ADHD? Familial and receiver operating characteristic curve analysis of mechanically assessed activity level. Wood, A. C, Asherson, P., Rijsdijk, F., & Kuntsi, J. Journal of the American Academy of Child and Adolescent Psychiatry, 48(10):1023–30, October, 2009.
Is overactivity a core feature in ADHD? Familial and receiver operating characteristic curve analysis of mechanically assessed activity level. [link]Paper  doi  abstract   bibtex   
Symptoms of overactivity form part of the DSM-IV criteria for the combined or hyperactive-impulsive subtypes of attention-deficit/hyperactivity disorder (ADHD); yet little data exist that would quantify the nature of the overactivity component. We aimed to quantify the ability of four different measures of motion sensor data, taken from actigraphs, and the intraindividual variability (IIV) in these measures, to distinguish ADHD cases from controls. Furthermore, we aimed to investigate the degree of shared familial influences on these measures and the ADHD diagnosis.
@article{wood_is_2009,
	title = {Is overactivity a core feature in {ADHD}? {Familial} and receiver operating characteristic curve analysis of mechanically assessed activity level.},
	volume = {48},
	issn = {1527-5418},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/19701105},
	doi = {10.1097/CHI.0b013e3181b54612},
	abstract = {Symptoms of overactivity form part of the DSM-IV criteria for the combined or hyperactive-impulsive subtypes of attention-deficit/hyperactivity disorder (ADHD); yet little data exist that would quantify the nature of the overactivity component. We aimed to quantify the ability of four different measures of motion sensor data, taken from actigraphs, and the intraindividual variability (IIV) in these measures, to distinguish ADHD cases from controls. Furthermore, we aimed to investigate the degree of shared familial influences on these measures and the ADHD diagnosis.},
	number = {10},
	urldate = {2012-07-23},
	journal = {Journal of the American Academy of Child and Adolescent Psychiatry},
	author = {Wood, Alexis C and Asherson, Philip and Rijsdijk, Frühling and Kuntsi, Jonna},
	month = oct,
	year = {2009},
	pmid = {19701105},
	keywords = {Actigraphy, Adolescent, Attention Deficit Disorder with Hyperactivity, Attention Deficit Disorder with Hyperactivity: dia, Attention Deficit Disorder with Hyperactivity: gen, Attention Deficit Disorder with Hyperactivity: psy, Child, Diagnosis, Differential, Diagnostic and Statistical Manual of Mental Disord, Female, Genetic Predisposition to Disease, Genetic Predisposition to Disease: genetics, Humans, Individuality, Male, Models, Psychological, Motor Activity, Multivariate Analysis, Personality Assessment, Phenotype, Quantitative Trait, Heritable, ROC Curve, Reference Values, Social Environment},
	pages = {1023--30},
}

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