Validity of a food frequency questionnaire to assess food intake in Mexican adolescent and adult population

Abstract

Objective. To assess the validity of a 140-item semiquantitative food frequency questionnaire (SFFQ), in Mexican adolescents and adults. Materials and methods. Dietary intakes using a SFFQ and two 24-hour dietary recalls (24DRs), in nonconsecutive days during the same week were measured from 178 adolescents and 230 adults participating in the Mexican National Health and Nutrition Survey-2012. Validity was evaluated using correlation coefficients (CC), deattenuated CC, linear regression models, cross-classification analysis, and the Bland-Altman method. Results. In adults, deattenuated correlation coefficients between the SFFQ and the 24DRs ranged from 0.30 for folate to 0.61 for saturated fat. In addition, 63% adults and 62% adolescents were classified in the same and adjacent quartile of nutrient intake when comparing data from SFFQ and 24DRs. Conclusions. The SFFQ had moderate validity for energy, macronutrients and micronutrients. It also had good validity to rank individuals according to their dietary intake of different nutrients.

Vitamin D status by sociodemographic factors and body mass index in Mexican women at reproductive age

“…27 The dietary information was gleaned in accordance with the methodology described by López and colleagues. [28][29][30] Those foods that were the main source of dietary VD were identified according to their reported VD content in the food composition tables used by Ensanut 2012. 31 The first 10 foods that contributed more than 10% of VD intake in 24 h were listed in decreasing order.…”

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“…This could favor its use for estimating actual intakes, instead of usual intakes, assuming that the week-by-week variability could be lower than the day-to-day variation. Additionally, the SFFQ used in this study has been previously validated in Mexican adults, 45 showing usefulness to estimate the dietary intake in that population.…”