Abstract:
:This study assessed the validity of a food frequency questionnaire (FFQ-Porto Alegre), covering 135 food items, in comparison with the average of two consecutive 24-hour dietary recall questionnaires for adolescents, adults, and elderly who were randomly selected from a population-based survey. The Pearson correlation coefficients and cross-classification by quartiles of intake were used. The nutrients were log transformed and energy adjusted. The mean of adjusted de-attenuated correlation coefficient for adolescents was 0.44 and ranged from 0.18 (zinc) to 0.69 (folate) and for adult and elderly participants they were, respectively, 0.42, ranging from 0.16 (iron) to 0.73 (energy) and 0.52, ranging from 0.25 (vitamin E) to 0.84 (energy). The average classification percentage into the same or adjacent quartile for the two methods was 74.6% for adolescents, 74.9% for adults, and 81.2% for the elderly population. The FFQ showed fair relative validity for adolescents and adults, and may be used to study the dietary determinants of obesity and non-transmissible diseases in epidemiological surveys.
journal_name
Cad Saude Publicajournal_title
Cadernos de saude publicaauthors
Henn RL,Fuchs SC,Moreira LB,Fuchs FDdoi
10.1590/s0102-311x2010001100008subject
Has Abstractpub_date
2010-11-01 00:00:00pages
2068-79issue
11eissn
0102-311Xissn
1678-4464pii
S0102-311X2010001100008journal_volume
26pub_type
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