Development and validation of a food frequency questionnaire for consumption of polyphenol‐rich foods in pregnant women

摘要

Previous studies have shown that maternal consumption of polyphenol‐rich foods after the third trimester of pregnancy may interfere with the anatomical and functional activity of the fetal heart as, to our knowledge, there are no validated instruments to quantify total polyphenols in pregnant women. The aim of this study was evaluate the reproducibility and validity of a food frequency questionnaire ( ), with 52 items, to assess the intake of polyphenol‐rich foods in pregnant women in razil. This cross‐sectional study included 120 pregnant women who participated in nutritional interviews in two moments. The intake of polyphenols estimated by the developed was compared with the average of two 24‐h recalls (24 ), with the average intake measured by a 3‐day food diary ( 3days) and with the urinary excretion of total polyphenols. The triangular method was applied to calculate Pearson's correlation coefficients, intraclass correlation and land– ltman plots for the , using an independent biochemical marker, in addition to classification by quarters of consumption. The questionnaires were log transformed, adjusted for body mass index and gestational age. The adjustment for energy was applied only of 24 and 3days. Analysis of the reproducibility between the showed a very high correlation (  = 0.72;  FFQ and urinary excretion (0.23;  = 0.01). The association between the dietary survey methods was moderate to very high (  = 0.36 to  = 0.72;