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Strengths of the study lie in its moderate sample size and the use of the well-validated AUDIT-C screening test (albeit originally validated in the format of verbal administration rather than as part of a written questionnaire).
The foot function index (FFI) is another validated, self-reported foot questionnaire that was originally validated in patients with rheumatoid arthritis (Budiman-Mak et al. 1991), but it was revised and there are now several versions in different languages.
The FQ was originally validated in primary care, and has demonstrated good face and discriminant validity and good and stable psychometric properties across populations [ 27, 28].
Finally, the MNA was originally validated in relatively healthy old people.
The CES-D was originally validated in the general adult population [ 33].
In addition, the DEPS was originally validated in an adult sample.
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In most cases, the algorithms as originally validated resulted in a prevalence that was intermediate between the most inclusive approach (using hospitalization, claims and ACCS data) and the most restrictive approach (using hospitalization data only).
The questions were originally validated for use in an interviewer assisted questionnaire.
Although DS were not verified by a structured psychiatric interview and therefore may have been misclassified, syndromal depression was not a study variable, and the measure of DS was originally validated against psychiatric interviews in medical patient samples.
We present a population-based study of the impact of comorbidity (as measured by the Charlson comorbidity score, originally validated using 10-year survival in breast cancer patients) on breast cancer survival and mortality in a Danish population from 1995 to 2005 (Charlson et al, 1987).
Methods are often better in the datasets they were originally evaluated: We also note those methods perform better in datasets in which they were originally validated, which is somewhat expected due to fine tuning procedures.
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