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Food Frequency Questionnaire is a Valid Tool in the Nutritional Assessment of Brazilian Women of Diverse Ethnicity

食物頻率問卷對於不同種族的巴西婦女是一種具有效度的營養評估工具

Abstracts


本研究目的為確認食物頻率問卷(FFQ)作為多種族背景的一巴西族群之熱量及選出的營養素攝取評估的效度。FFQ攝取量評估的效度是測試55名巴西婦女,包括26名白人、15名日本裔及14名其他種族。此套FFQ原本是為SaoPaulo的一個乳癌病例對照研究而發展出來的。以兩季的飲食紀錄(DRs)當作參考值。使用USDA及日本食物組成表計算熱量及24種營養素的攝取量。使用斯皮爾曼相關係數評估效度及信度。結果顯示FFQ比起DR,在雞肉/家禽類、蛋類及豆類是高估,反之猪肉及脂肪是低估。再者,FFQ高估葉酸、纖維素及異黃酮的攝取,反之熱量、脂肪、碳水化合物、α-胡蘿蔔素及蕃茄紅素是低估。經過熱量校正後,FFQ與DR對營養素攝取量的評估,在異黃酮(0.76)、鈣質(0.50)及維生素C(0.49)有高的相關係數。相反地,對熱量及其他營養素的效度並不一致,從適度地高到低。總之,對有多種族背景的巴西婦女,FFQ在評估某些營養素攝取量的效度是適度地高。

Parallel abstracts


The objective of this study was to validate a food frequency questionnaire (FFQ) used to estimate energy and selected nutrient intake in a Brazilian population with various ethnic backgrounds. Validity of intake estimated using the FFQ was tested among 55 Brazilian women, namely 26 Caucasians, 15 of Japanese descent, and 14 others. The FFQ was originally developed for use in a case-control study of breast cancer conducted in São Paulo. Dietary records (DRs) recorded in two seasons were used as references. Intake of energy and 24 nutrients were calculated using the USDA and Japanese food composition tables. Validity and reproducibility were evaluated using Spearman’s correlation coefficients. Results showed that intake of chicken/poultry, eggs and legumes were overestimated by the FFQ compared to the DR, whereas that of pork and fat was underestimated. Further, intake of folate, fiber and isoflavones was overestimated by the FFQ whereas that of energy, fat, carbohydrate alphacarotene and lycopene was underestimated. Energy-adjusted correlation coefficients between nutrient intakes estimated with the FFQ and DR were high for isoflavones (0.76), calcium (0.50), and vitamin C (0.49). In contrast, validity varied from moderately high to low for energy and other nutrients. In conclusion, validity of the FFQ for estimation of the intake of selected nutrients among Brazilian women with varied ethnic background was moderately high.

Parallel keywords

FFQ ethnicity reproducibility validity nutritional assessment

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