Workload assessment: cross-cultural adaptation, content validity and instrument reliability.

Area of Science:

• Healthcare research
• Psychometrics
• Occupational health

Background:

• The National Aeronautics and Space Administration - Task Load Index (NASA-TLX) is a widely used tool for measuring subjective workload.
• Adapting and validating instruments for different languages and cultural contexts is crucial for their effective use.

Purpose of the Study:

• To translate, adapt, and validate the content and assess the reliability of the NASA-TLX instrument in Brazilian Portuguese.

Main Methods:

• A methodological study involving translation, synthesis, back-translation, expert review, and pre-testing.
• Content Validity Index (CVI) and Cronbach's alpha were calculated to assess validity and reliability.

Main Results:

• Following initial adjustments, including item modification and removal, the adapted instrument achieved consensus and approval.
• The final version demonstrated satisfactory content validity (CVI) and reliability (Cronbach's alpha).

Conclusions:

• The Brazilian Portuguese version of the NASA-TLX is a reliable and content-valid instrument.
• This validated tool can be effectively used to assess workload in Brazilian healthcare professionals.