Finally, we examined the degree to which self-report of impulsivity and symptoms related to PTSD or mTBI are associated with anatomical alterations.
Second, the survey was not comprised of standardized rating scales, and the extent to which self-report data collected is reliable or valid is unknown.
Unidimensionality is an essential marker of construct validity [ 27], that is, the extent to which self-report scores indicate the theoretical construct of interest [ 28, 29].
Without an external gold standard criterion, it remains unclear the extent to which self-reports differ from actual experiences.
Finally, future research should collect additional data and use an external criterion and examine the extent to which self-reports correspond to the external criterion across non-Hispanic Caucasians and Hispanics.
To minimise classification errors, we adapted registration forms from those used recently in a randomised trial in which self report was used for the registration of ankle injuries.
Moving forward, it is expected that 'new' countries for which EQ-5D-3L value sets are to be developed will comprise middle income or developing countries for which self reported health for such large numbers of citizens will not be available.
FOOTNOTES [1] This is not to deny that there are limited contexts in which self-reporting of "racial" identity may be informative in a local or regional context.
In contrast to studies of clinical samples, reports based on population-based samples in which self-report or direct assessments of psychiatric disorders are collected from both parents and offspring are rare.
We lack data on recent physical measures (i.e. hypertension, lipid profiles), for which self-reporting is notoriously poor.
A record of a test in administrative data was viewed as the gold standard against which self-report was validated.
