Ahmed Gharib Khamis1, Akwilina Wendelin Mwanri2, Julius Edward Ntwenya3, Mbazi Senkoro4, Katharina Kreppel5,6, Bassirou Bonfoh7, Sayoki Godfrey Mfinanga8,4,6, Gideon Kwesigabo8. 1. Department of Epidemiology and Biostatistics, Muhimbili University of Health and Allied Sciences, Dar-Es-Salaam, Tanzania. ahmadboycd@gmail.com. 2. Department of Food Technology, Nutrition and Consumer Sciences, Sokoine University of Agriculture, Morogoro, Tanzania. 3. Department of Public Health, The University of Dodoma, Dodoma, Tanzania. 4. National Institute for Medical Research, Muhimbili Medical Research Centre, Dar-es-Salaam, Tanzania. 5. School of Life Sciences and Bio-Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania. 6. Department of Environmental Health and Ecological Sciences, Ifakara Health Institute, Dar-es-salaam, Tanzania. 7. Centre Suisse de Recherches Scientifiques en Côte D'Ivoire, Abidjan, Côte d'Ivoire. 8. Department of Epidemiology and Biostatistics, Muhimbili University of Health and Allied Sciences, Dar-Es-Salaam, Tanzania.
Abstract
OBJECTIVE: Food frequency questionnaires are widely used as a dietary assessment tool in nutritional epidemiology to determine the relationship between diet and diseases. In Tanzania, there are several cultural variations in food intake which makes it necessary to design and validate a culture-specific food frequency questionnaire (CFFQ). Therefore, we designed a 27-items CFFQ and examine its validity in pastoral communities. Validity of CFFQ was assessed by comparing nutrient intake estimated from the CFFQ against the average from two 24-h diet recall (2R24). Spearman's correlation coefficients, cross classification and Bland-Altman's methods were used to assess the validity of CFFQ. RESULTS: A total of 130 adults aged 18 years and above completed both CFFQ and 2R24. Correlation coefficients between CFFQ and 2R24 ranged from low (r = - 0.07) to moderate (r = 0.37). The correlation coefficients were moderately significant for kilocalories (r = 0.31, p < 0.001), carbohydrate (r = 0.33, p < 0.001), magnesium (r = 0.37, p < 0.001), and iron (r = 0.34, p < 0.001). On average, about 69% of participants were correctly classified into the same or adjacent quartile of energy and nutrient intake, while 9% were misclassified by the CFFQ. Bland-Altman's plot demonstrated that the CFFQ had acceptable agreement with the 2R24.
OBJECTIVE: Food frequency questionnaires are widely used as a dietary assessment tool in nutritional epidemiology to determine the relationship between diet and diseases. In Tanzania, there are several cultural variations in food intake which makes it necessary to design and validate a culture-specific food frequency questionnaire (CFFQ). Therefore, we designed a 27-items CFFQ and examine its validity in pastoral communities. Validity of CFFQ was assessed by comparing nutrient intake estimated from the CFFQ against the average from two 24-h diet recall (2R24). Spearman's correlation coefficients, cross classification and Bland-Altman's methods were used to assess the validity of CFFQ. RESULTS: A total of 130 adults aged 18 years and above completed both CFFQ and 2R24. Correlation coefficients between CFFQ and 2R24 ranged from low (r = - 0.07) to moderate (r = 0.37). The correlation coefficients were moderately significant for kilocalories (r = 0.31, p < 0.001), carbohydrate (r = 0.33, p < 0.001), magnesium (r = 0.37, p < 0.001), and iron (r = 0.34, p < 0.001). On average, about 69% of participants were correctly classified into the same or adjacent quartile of energy and nutrient intake, while 9% were misclassified by the CFFQ. Bland-Altman's plot demonstrated that the CFFQ had acceptable agreement with the 2R24.
Authors: Rachel M Zack; Kahema Irema; Patrick Kazonda; Germana H Leyna; Enju Liu; Susan Gilbert; Zohra Lukmanji; Donna Spiegelman; Wafaie Fawzi; Marina Njelekela; Japhet Killewo; Goodarz Danaei Journal: Public Health Nutr Date: 2018-04-16 Impact factor: 4.022