@article{ref1,
title="Self-report reliability and symptomatology of habitual caffeine consumption",
journal="British journal of clinical pharmacology",
year="1989",
author="James, J. E. and Bruce, M. S. and Lader, M. H. and Scott, N. R.",
volume="27",
number="4",
pages="507-514",
abstract="1. A large body of research on the demography of caffeine use and its potential health consequences has been undermined by the absence of empirical data on the reliability of retrospective self-reports of caffeine consumption. 2. The principal aim of the present study was to use standard bioanalytic method to assess the reliability of subjects' self-reported caffeine use. Saliva samples were obtained from 142 first-and second-year medical students and assayed for caffeine and paraxanthine. 3. Self-reported caffeine use was found to be significantly correlated with salivary caffeine (r = 0.31, P less than 0.001) and paraxanthine (r = 0.42, P less than 0.001), thereby providing qualified support for use of questionnaires to estimate patterns of caffeine consumption. 4. A secondary aim of the study was to extend previous research concerning the symptomatology of caffeine use by examining the association between caffeine exposure and a variety of measures of somatic and psychological health. Caffeine consumption was reliably associated with the self-reported occurrence of somatic symptoms, but not psychological well-being.<p /><p>Language: en</p>",
language="en",
issn="0306-5251",
doi="",
url="http://dx.doi.org/"
}