[Relative validity of food frequency questionnaire for estimating dietary nutrients intake].

Objective: To assess the relative validity of food frequency questionnaire( FFQ) for estimating dietary nutrients and food intakes.
Methods: Using random sampling methods to select 200 people from Minhang District and Jinshan District. Dietary intakes were estimated by weighed dietary records combining with 24 h dietary recalls( as reference method) and food frequency questionnaire. Relative validity were examined by T-test, Wilcoxon rank test and correlation analysis.
Results: The foods groups were the same in FFQ and 24 h dietary recalls. Correlated with daily intake of grains, beans and products, vegetables, cruciferous vegetables, fruits, meat and poultry, aquatic product, milk and products in two methods( Correlation coefficients: 0. 248- 1. 000). The daily food of energy, protein, fat, carbohydrate, cholesterol had significantly positive correlation in FFQ and 24 h dietary recalls( Correlation coefficients: 0. 209- 0. 340). No statistical difference in energy and fat. The daily food of Mg, K, P, Mn, I, Ca, Se had significantly positive correlation in two methods( Correlation coefficients: 0. 204-0. 419). No statistical difference in Mg, K, P, Mn, I. The daily food of vitamin B1、B2、C、niacin had significantly positive correlation in two methods( Correlation coefficients:0. 170- 0. 305). No statistical difference in vitamin B1、B2.
Conclusion: Food frequency questionnaire can be used to evaluate dietary intakes of I, cruciferous vegetables, soy isoflavones, energy, fat, Mg, K, P, Mn, vitamin B1 and vitamin B2.