Low Back Pain Clinical Trial
Official title:
Traduzione, Adattamento Transculturale e Misura Delle proprietà Psicometriche Del Questionario "Dance Functional Outcome Survey" (Dfos) in Lingua Italiana
Study Design: Evaluation of the psychometric properties of a translated, culturally adapted
questionnaire.
Objective: Translating, culturally adapting, and validating the Italian version of the Dance
Functional Outcome Survey (DFOS-IT), allowing its use with Italian-speaking dancers to
evaluate their musculoskeletal health and wellbeing inside and outside Italy.
Summary of Background Data: Musculoskeletal injuries are a phenomenon of huge prevalence and
has been a major focus within peer-reviewed literature since the 1980s.
Growing attention is devoted to standardized outcome measures to improve interventions for
injured dancers.
A translated form of the DFOS, the only existing outcome measure that focus on the unique
functional requirements of dancers, has never been validated within the Italian dancers
population.
The DFOS is a dance-specific, lower extremity and low back functional outcome measure, the
first and only existing at the moment.
The DFOS-IT questionnaire will be developed involving forward-backward translation, a final
re-evaluation made by a representative multidisciplinary expert committee and the realization
of a prefinal version to establish a proper correspondence with the original English latest
version.
A factor analysis and analyses of internal consistency, construct validity, internal
responsiveness and sensitivity will be conducted. The reliability will be measured for
internal consistency (Cronbach α) and a factor analysis will be applied to analyse the
internal structure. The divergent validity will be measured by comparing the data obtained
from the compilation of the DFOS-IT with those of the SF-36 to evaluate the psychometric
properties and the equivalence of the results adapted to the Italian language and culture.
The validation of the psychometric properties of the instrument will start after it will been
administered digitally, via a link to a website built using LimeSurvey, an application based
on a MySQL database that allows the realization of online surveys, to a sample population of
at least 140 dancers (10 subjects for each item of DFOS-IT) professionals or
pre-professionals of age recruited through companies, professional academies, dance high
schools and health professionals working with dancers. Through this link, from the time it
will be online up to 30 September 2019, the dancers who will give their informed consent to
their voluntary participation, will be able to access the online questionnaire.
Upon enrollment, dancers will answer a demographics questionnaire, the DFOS-IT, and the
SF-36. If they will take part in the reliability portion, then they filled out the DFOS-IT a
second time within 4 to 9 days and, if in the responsiveness testing, a third time after
4-months.
For the statistical analysis standard psychometric techniques will be used, such as
reliability assessments, convergent and discriminant validity tests of each item and of the
construct in its entirety, empirical validity tests in relation to the clinical status and
formal tests to assess their accuracy to ends to test the hypotheses.
The investigators hypothesize to be able to reproduce a tool that reflects the
characteristics of the DOFS in the original language and therefore it will prove to have,
even in its Italian version, an acceptable psychometric performance as an outcome and
screening measure for dancers. The DFOS-IT will show to be a useful tool to monitor both
healthy state and functional limitation following lower extremity or low back injury in adult
ballet and modern dancers.
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