Development and validation of a food frequency questionnaire to assess the diet glycemic index of adults in Trinidad and Tobago.

摘要

The objectives of this thesis were to develop a Food Frequency Questionnaire (FFQ) that is able to assess diet glycemic index (GI), and compare estimates of nutrient intake with those collected from 7-day food records (FR) in Trinidad. 152 healthy adults completed the FFQ either before or after the FR's. Differences between means estimated by the FFQ and FR's are significant for all macronutrients except GI and cholesterol. Correlation coefficients between the FFQ and FR data for fat, available carbohydrate, fibre and GI are; 0.50 (p 0.05), 0.40 (p 0.05), 0.25 (p 0.05), and 0.25 (p 0.05) respectively. The principal criterion for validity for the FFQ is correlation coefficients ≥0.5. These results show that intake assessed by the FFQ is acceptable for measuring some nutrients but not particularly good for measuring GI. Additional administrations of the FFQ and FR are needed to improve FFQ precision and complete the validation process.