Calibration of a semi-quantitative food frequency questionnaire in early pregnancy

Fawzi, Wafaie W.; Rifas‐Shiman, Sheryl L.; Rich‐Edwards, Janet W.; Willett, Walter C.; Gillman, Matthew W.

doi:10.1016/j.annepidem.2004.03.001

Cited by 122 publications

(126 citation statements)

References 33 publications

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“…In a study of 72 African American and 132 European American pregnant women, Fawzi et al (2004) reported the percent difference in blood nutrient levels comparing the highest to the lowest deciles of intake. They reported a 21% increase for AfricanAmerican women and 64% increase for European American women for lycopene, compared with the 32% increase we found ( Figure 1).…”

Section: Discussionmentioning

confidence: 99%

“…Fatty acids chosen for this analysis were those hypothesized to be associated with prostate cancer, and those for which there is no endogenous synthesis. In another analysis, the percent of fatty acids in the adipose tissue (which is the only reasonable way to express fatty acid value in such measurements) correlated best with intakes also expressed as a percentage of total fatty acid intake (Fawzi et al, 2004).…”

Section: Methodsmentioning

confidence: 95%

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Validation of a food frequency questionnaire measurement of selected nutrients using biological markers in African-American men

et al. 2007

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Objective: To validate selected nutrients assessed by the food frequency questionnaire (FFQ) used in the Harvard cohort studies in an African-American group. Design: Blood aliquots were pooled for each decile of intake of two carotenoids and alpha tocopherol as measured by FFQ. These pooled samples were analyzed for nutrient content, and the resultant blood levels were plotted against the median for each decile of intake. In addition, adipose tissue samples taken from each man were analyzed for content of specific fatty acids. We calculated the Spearman correlations comparing intakes of specific fatty acids as percent of total fat intake, adjusted for energy intake, as measured by FFQ, with the percentage of the corresponding fatty acid in adipose tissue. Subjects and settings: African-American men (N ¼ 104) with prostate cancer were recruited from a Detroit physician's practice and completed a detailed FFQ. Results: Comparing decile 10 with decile 1 intake of nutrients as measured by FFQ, there was a 32% higher blood level of lycopene, a 288% higher blood level of beta carotene and a 100% higher blood level of alpha tocopherol. The Spearman correlation coefficients between intakes of linoleic acid, alpha linolenic acid, long-chain n-3 fatty acids and trans fatty acid measured by FFQ and the corresponding adipose tissue levels were between 0.10 and 0.47. Conclusion: The FFQ was able to distinguish meaningful differences in biochemical measurements of selected nutrients and presumably corresponding differences in the extremes of intake in African-American men with prostate cancer who were likely to be motivated to report accurately. However, the results found are similar to those found in other populations.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 95%

Validation of a food frequency questionnaire measurement of selected nutrients using biological markers in African-American men

et al. 2007

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“…39 The second trimester FFQ also included questions about use of nutritional supplements including vitamin B12 and folic acid, which we used to calculate total second trimester intake of these nutrients. At the first trimester visit, we also conducted a 33-item detailed interview about use (frequency, brand/type, dosage and timing) of nutritional supplements including vitamin B12 and folic acid in early pregnancy.…”

Section: Methodsmentioning

confidence: 99%

Gestational intake of methyl donors and global LINE-1 DNA methylation in maternal and cord blood: Prospective results from a folate-replete population

et al. 2012

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“…The FFQ's ability to assess dietary intake of pregnant women is due to the fact this method spans a longer time frame, thus allowing the detection of changes in dietary intake during each trimester of pregnancy (8)(9)(10)(11) .…”

Section: Ffq Pregnant Women Validation Studiesmentioning

confidence: 99%

Relative validation of a quantitative FFQ for use in Brazilian pregnant women

Barbieri

Nishimura

Crivellenti

et al. 2012

Public Health Nutr.

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Objective: To evaluate the ability of an FFQ, designed for use in Brazilian pregnant women, to estimate nutrient intakes during pregnancy. Design: A prospective study was conducted among 103 pregnant women attended by the Brazilian national health-care service. Food intake during pregnancy was evaluated by three 24 h dietary recalls (24hR), one per trimester of pregnancy, and also by two FFQ. The FFQ with eighty-five food items included questions about frequency of intake and portion sizes during two periods: the first 24 weeks of pregnancy and the pregnancy period as a whole. Deattenuated Pearson's correlation coefficients and joint classification into quartiles of nutrient intake were applied. Setting: Ribeirão Preto, São Paulo State, Brazil. Subjects: One hundred and three pregnant women, aged 18-35 years. Results: Acceptable correlation coefficients (r . 0?35) were found for Ca, K, Zn, Mg, fibre, vitamin C, niacin and folic acid for intake for the first 24 weeks; and for energy, lipids, protein, carbohydrate, Fe, K, Zn, fibre, vitamin B 6 , riboflavin and niacin for the gestational period as a whole. A high proportion of study participants ($70 %) were categorized into the same or adjacent quartiles for estimated energy, carbohydrate, Ca, K, fibre, Zn, cholesterol, vitamin A, riboflavin, niacin, vitamin C, vitamin E and folic acid. Gross misclassification ranged from 2?3 % (dietary fibre) to 12?5 % (vitamin A, thiamin and SFA). Conclusions: The FFQ is a useful tool for assessing categories of nutrient intake during pregnancy, since a high proportion of women were classified into the same or adjacent quartiles. Keywords FFQ Pregnant women Validation studiesInadequate maternal diet is a relevant risk factor for complications during pregnancy (1,2) , impaired fetal development (3) and may also be linked to higher risk of chronic diseases during childhood (4) and adult life (5) .The FFQ is a method widely used in epidemiological studies aimed at categorizing individuals into different levels of consumption and determining their relationships with health outcomes (6,7) . The FFQ's ability to assess dietary intake of pregnant women is due to the fact this method spans a longer time frame, thus allowing the detection of changes in dietary intake during each trimester of pregnancy (8)(9)(10)(11) .Validation studies of FFQ for use in pregnant women have shown that nutrient estimates using this method exhibit high levels of agreement with intake estimates using the 24 h dietary recall (24hR) (12)(13)(14) or daily records (DR) (15,16) , suggesting a good accuracy of the FFQ for assessing dietary intake in this population group. Since 24hR and FFQ might have correlated errors, related to memory and estimation of portion size, the use of multiple DR or weighed records as the reference method is recommended. Nevertheless, when literacy or motivation of participants is low, the 24hR might be applied as the reference measure of nutrient intake (6) .In an earlier study, an FFQ was developed for use in pregnant women ...

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Calibration of a semi-quantitative food frequency questionnaire in early pregnancy

Cited by 122 publications

References 33 publications

Validation of a food frequency questionnaire measurement of selected nutrients using biological markers in African-American men

Validation of a food frequency questionnaire measurement of selected nutrients using biological markers in African-American men

Gestational intake of methyl donors and global LINE-1 DNA methylation in maternal and cord blood: Prospective results from a folate-replete population

Relative validation of a quantitative FFQ for use in Brazilian pregnant women

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