Validity of a food-frequency questionnaire for elderly men in southeast China

Le Jian, Colin W Binns, Andy H Lee
2006 Public Health Nutrition  
Objective: To investigate the internal validity of a food-frequency questionnaire (FFQ) developed for a case -control study of prostate cancer in southeast China. Design: A comprehensive questionnaire comprising a quantitative FFQ and a short food habit questionnaire (SFHQ) was developed and modified from previous cancer and nutritional studies. The Goldberg formula (ratio of energy intake (EI) to basal metabolic rate (BMR), EI/BMR) was used to assess the validity of the FFQ by making
more » ... by making comparisons with physical activity levels. Physical activity levels were measured by the estimated total metabolic equivalents (MET) and the ratio of energy expenditure (EE) to BMR (EE/BMR). Correlation analyses were undertaken to compare the SFHQ variables with those of the quantitative FFQ. Setting: Hangzhou, Zhejiang Province, China. Subjects: A total of 404 men over 45 years old with or without prostate cancer were recruited from eight hospitals. Results: The partial correlation coefficients, controlling for age and family history of prostate cancer, were moderate to high (P , 0.05) for preserved foods intake, fat consumption and tea drinking variables between the SFHQ and the quantitative FFQ. The average EI/BMR was 1.72, with 76% of subjects exceeding the Goldberg cut-off value of 1.35. Apart from weight, BMI, EE/BMR and MET, there were no significant differences in characteristics between low (, 1.35) and normal EI/BMR groups. Conclusions: The FFQ is demonstrated to be a valid instrument to measure energy and food intake for elderly men in southeast China. Keywords Food-frequency questionnaire Validity Reproducibility Energy intake Energy expenditure Physical activity level Metabolic equivalents China q The Authors 2006
doi:10.1017/phn2005919 pmid:17010259 fatcat:xhqd47awavbhzoqpmvrk4bw6oy