Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted.

The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.

Updates regarding government operating status and resumption of normal operations can be found at OPM.gov.

Appendix C

The content in this publication was current at the time it was published, but it is not being updated. The publication is provided for historical purposes only.​

Table 19. Supplementation and Various Outcomes

Outcome N R R 2 p
Executive Functions 11 0.726 0.527 0.0075
Inhibition and flexibility
8 0.777 0.605 0.0138
Attention 16 0.457 0.208 0.0652
Other cognitive and motor skills 7 0.203 0.041 0.6297

Note. N=number of effect sizes. A positive correlation indicates that supplementation with dopamine precursors is associated with better performance on these cognitive tasks.

Back to Appendix C Tables

first | previous | next | last