A decade of EEG Theta/Beta Ratio Research in ADHD: a meta-analysis. Arns, M., Conners, C K., & Kraemer, H. C Journal of attention disorders, 17(5):374–83, July, 2013.
A decade of EEG Theta/Beta Ratio Research in ADHD: a meta-analysis. [link]Paper  doi  abstract   bibtex   
OBJECTIVE: Many EEG studies have reported that ADHD is characterized by elevated Theta/Beta ratio (TBR). In this study we conducted a meta-analysis on the TBR in ADHD. METHOD: TBR data during Eyes Open from location Cz were analyzed from children/adolescents 6-18 years of age with and without ADHD. RESULTS: Nine studies were identified with a total of 1253 children/adolescents with and 517 without ADHD. The grand-mean effect size (ES) for the 6-13 year-olds was 0.75 and for the 6-18 year-olds was 0.62. However the test for heterogeneity remained significant; therefore these ESs are misleading and considered an overestimation. Post-hoc analysis found a decreasing difference in TBR across years, explained by an increasing TBR for the non-ADHD groups. CONCLUSION: Excessive TBR cannot be considered a reliable diagnostic measure of ADHD, however a substantial sub-group of ADHD patients do deviate on this measure and TBR has prognostic value in this sub-group, warranting its use as a prognostic measure rather than a diagnostic measure.
@article{arns_decade_2013,
	title = {A decade of {EEG} {Theta}/{Beta} {Ratio} {Research} in {ADHD}: a meta-analysis.},
	volume = {17},
	issn = {1557-1246},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/23086616},
	doi = {10.1177/1087054712460087},
	abstract = {OBJECTIVE: Many EEG studies have reported that ADHD is characterized by elevated Theta/Beta ratio (TBR). In this study we conducted a meta-analysis on the TBR in ADHD.

METHOD: TBR data during Eyes Open from location Cz were analyzed from children/adolescents 6-18 years of age with and without ADHD.

RESULTS: Nine studies were identified with a total of 1253 children/adolescents with and 517 without ADHD. The grand-mean effect size (ES) for the 6-13 year-olds was 0.75 and for the 6-18 year-olds was 0.62. However the test for heterogeneity remained significant; therefore these ESs are misleading and considered an overestimation. Post-hoc analysis found a decreasing difference in TBR across years, explained by an increasing TBR for the non-ADHD groups.

CONCLUSION: Excessive TBR cannot be considered a reliable diagnostic measure of ADHD, however a substantial sub-group of ADHD patients do deviate on this measure and TBR has prognostic value in this sub-group, warranting its use as a prognostic measure rather than a diagnostic measure.},
	number = {5},
	urldate = {2015-04-09},
	journal = {Journal of attention disorders},
	author = {Arns, Martijn and Conners, C Keith and Kraemer, Helena C},
	month = jul,
	year = {2013},
	pmid = {23086616},
	keywords = {Adolescent, Attention Deficit Disorder with Hyperactivity, Attention Deficit Disorder with Hyperactivity: dia, Attention Deficit Disorder with Hyperactivity: phy, Attention Deficit Disorder with Hyperactivity: psy, Beta Rhythm, Beta Rhythm: physiology, Cerebral Cortex, Cerebral Cortex: physiopathology, Child, Female, Humans, Male, Reference Values, Reproducibility of Results, Theta Rhythm, Theta Rhythm: physiology},
	pages = {374--83},
}

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