Validation of the Glover-Nilsson Smoking Behavioral Questionnaire for the portuguese population: a psychometric process

OBJECTIVE To validate the Portuguese version of the Glover-Nilsson Smoking Behavioral Questionnaire (GNSBQ). METHODS This manuscript represents 2 studies. In the first, the free-translated Portuguese version of GNSBQ, currently in use, was administered to 124 healthy smokers for Confirmatory Factor Analysis (CFA). In the second, a forward-backward translation was developed to achieve a proper cultural and linguistic adaptation, which allowed creating a new Portuguese version of the GNSBQ. An Exploratory Factor Analysis (EFA) was then performed, including 120 healthy smokers who completed this new version. RESULTS In the first study, the results from performing a CFA were not acceptable, although the scale was internally consistent. The second study showed that the new Portuguese version of GNSBQ presented reliability and 2 cor-related factors retrieved from the EFA. CONCLUSION The new Portuguese version of the second study will contribute to an improved assessment of behavioral dependence in that population.