Relative validation of a quantitative FFQ for use in Brazilian pregnant women.
OBJECTIVE
To evaluate the ability of an FFQ, designed for use in Brazilian pregnant women, to estimate nutrient intakes during pregnancy.


METHODS
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.


METHODS
Ribeira˜o Preto, Sa˜o Paulo State, Brazil.


METHODS
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 B6, 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.
Post-Graduate Program in Community Health, School of Medicine of Ribeirão Preto (FMRP), University of São Paulo (USP), Ribeirão Preto, SP, Brazil.
Patrícia
P
Barbieri
Renata Y
RY
Nishimura
Lívia C
LC
Crivellenti
Daniela S
DS
Sartorelli
D000293:Adolescent; D000328:Adult; D001205:Ascorbic Acid / Q000008:administration & dosage; D001938:Brazil; D015930:Diet Records; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004041:Dietary Fats / Q000008:administration & dosage; D004043:Dietary Fiber / Q000008:administration & dosage; D004044:Dietary Proteins / Q000008:administration & dosage; D002149:Energy Intake; D005260:Female; D005492:Folic Acid / Q000008:administration & dosage; D006801:Humans; D039382:Maternal Nutritional Physiological Phenomena; D011939:Mental Recall; D018977:Micronutrients / Q000008:administration & dosage; D009525:Niacin / Q000008:administration & dosage; D015596:Nutrition Assessment; D009752:Nutritional Status; D064787:Portion Size / Q000706:statistics & numerical data; D011247:Pregnancy; D011446:Prospective Studies; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D016387:Women's Health; D055815:Young Adult
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004043:Dietary Fiber; D004044:Dietary Proteins; D018977:Micronutrients; D009525:Niacin; D005492:Folic Acid; D001205:Ascorbic Acid