ISSN:
1470-6431
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Economics
Notes:
In order to assess the influence of social desirability in a food frequency questionnaire (FFQ), 483 Portuguese university students (133 women and 350 men) were recruited to a two-part self-administered questionnaire: the first part included the Marlowe–Crowne Social Desirability Scale (M-CSDS), physical activity data and self-reported height and weight; the second part, a validated semiquantitative FFQ. All subjects completed the first part of the questionnaire but only 40.2% returned the FFQ fairly completed (no statistically significant differences were found between the two groups, for any of the variables studied). Statistical analysis included reliability and test–retest of M-CSDS, correlation and general linear model (GLM).The Cronbach's alpha of M-CSDS was 0.64 and a test–retest correlation of 0.80 was obtained in a subsample of 35 subjects who completed the scale twice. We found a significantly positive correlation between social desirability and vitamin E for women; when adjusted for physical activity, body mass index and energy, social desirability was positively correlated with vitamin E, magnesium and fibre for women; and vitamin C, magnesium and fibre, for men. In GLM, social desirability produced a significant upward bias in dietary fibre, sugars, β-carotene, vitamins C, E, magnesium, potassium and iodine, for women; and in dietary fibre, pufa n-3, folate, vitamins C, E, magnesium, manganese and potassium, for men.In GLM, and for both genders, social desirability produced a significant upward bias in vegetable consumption. Moreover, social desirability produced for women a significant downward bias in white bread, onion and beer, and for men in biscuits.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1470-6431.2003.00308_44.x
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