2.2.1.2. Pretest.
A pretest was conducted to obtain information on how the questionnaire worked and the feasibility of use under real-life conditions, assessing its ease of understanding,
acceptability and whether it could be completed in a reasonable amount of time.
The questionnaire was administered to 70 VDT workers of both sexes and different ages. After completing the questionnaire, they were invited to comment in a structured interview on any
aspect that involved difficulty.
A report was then prepared identifying difficulties in understanding the questions and responses.
We revised those items in which at least 15% of respondents experienced difficulty [32,33].