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

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Bibliographic Details
Title:	Methodological considerations for the quantification of self-reported caffeine use.
Authors:	Addicott, Merideth, Yang, Lucie, Peiffer, Ann, Laurienti, Paul
Source:	Psychopharmacology. Apr2009, Vol. 203 Issue 3, p571-578. 8p. 2 Charts, 1 Graph.
Subjects:	Self-evaluation, Human behavior research, Habit, Conduct of life, Caffeine, Cooking
Abstract:	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. 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). 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. 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. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	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. 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). 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. 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. [ABSTRACT FROM AUTHOR]
ISSN:	00333158
DOI:	10.1007/s00213-008-1403-5