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Psychopharmacology (Berl). 2009 Apr;203(3):571-8. doi: 10.1007/s00213-008-1403-5. Epub 2008 Nov 15.

Methodological considerations for the quantification of self-reported caffeine use.

Author information

1
Department of Radiology, Wake Forest University School of Medicine, Medical Center Blvd, Winston-Salem, NC 27157, USA.

Abstract

RATIONALE:

The field of research regarding the effects of habitual caffeine use is immense and frequently utilizes self-report measures of caffeine use. However, various self-report measures have different methodologies, and the accuracy of these different methods has not been compared.

MATERIALS AND METHODS:

Self-reported caffeine use was estimated from two methods (a retrospective interview of weekly caffeine use and a 7-day prospective diary; n = 79). These estimates were then tested against salivary caffeine concentrations in a subset of participants (n = 55).

RESULTS:

The estimates of caffeine use (mg/day) from the interview- and diary-based methods correlated with one another (r = 0.77) and with salivary caffeine concentrations (r = 0.61 and 0.68, respectively). However, almost half of the subjects who reported more than 600 mg/day in the interview reported significantly less caffeine use in the diary.

CONCLUSIONS:

Self-report measures of caffeine use are a valid method of predicting actual caffeine levels. Estimates of high caffeine use levels may need to be corroborated by more than one method.

PMID:
19011837
PMCID:
PMC2829439
DOI:
10.1007/s00213-008-1403-5
[Indexed for MEDLINE]
Free PMC Article
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