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| Author(s): |
Tatiana Sadalla Collese
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD) |
| Defense date: | 2020-09-28 |
| Examining board members: |
Heraclito Barbosa de Carvalho;
Catarina Machado Azeredo;
Adriana Garcia Peloggia de Castro;
Moacyr Roberto Cuce Nobre
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| Advisor: | Heraclito Barbosa de Carvalho; Dirce Maria Lobo Marchioni |
| Abstract | |
Background: Accurate dietary assessment in children is identified as an important fact to investigate the associations between diet and disease. However, there are limited studies about validity of dietary assessment methods in children. Aim: To evaluate the validity of two questionnaires [Food Frequency Questionnaire (FFQ) and 24h Dietary Recall (R24h)] to estimate fruit, vegetable, and dietary iron intake in South American children and adolescents. Methods: Multicenter observational study, in a sample of children and adolescents (3-17 years) participating in the SAYCARE (South American Youth/Child Cardiovascular and Environmental) study, from five cities: Buenos Aires (Argentina), Lima (Peru), Medellin (Colombia), São Paulo and Teresina (Brazil). The FFQ was filled out according to the consumption over the last three months; the R24h was applied three times (two weekdays, one weekend day) and the mean intake of these three days (combined with the frequency of intake) was calculated using the multiple source method (MSM), to validate the fruit and vegetable consumption (n = 45) against plasma dosages of retinol, beta-carotene, alpha-tocopherol, and ascorbic acid; and for dietary iron intake (n = 149) against serum dosages of iron and ferritin. Dietary intake in relation to blood biomarkers was assessed using multiple linear regression or multilevel regression, and receiver operating characteristics (ROC) curve analysis. Results: This thesis consists of nine articles; three principal articles (a systematic review, one article validating fruits and vegetables intake, and one article validating dietary iron intake), in addition to six complementary articles. Correlation coefficients were 0.29 and 0.35 for fruit and vegetable intake estimated by the FFQ and the MSM, respectively; and correlation coefficients for dietary iron intake ranged from 0.81-0.87 for the FFQ, and 0.12-0.18 for the MSM. Conclusion: The SAYCARE FFQ exhibited good ability to rank fruit and vegetable intake in children, and dietary iron intake in children and adolescents (AU) | |
| FAPESP's process: | 16/13922-1 - Validation of Dietary Assessment Methods in Children: SAYCARE Study |
| Grantee: | Tatiana Sadalla Collese |
| Support Opportunities: | Scholarships in Brazil - Doctorate |