J. Hébert|Phalguni Gupta|Hemali Mehta|CB Ebbeling|R. R. Bhonsle|F. Varghese
Sources of variability in dietary intake in two distinct regions of rural India: implications for nutrition study design and interpretation
University of South Carolina|Tata Institute of Fundamental Research|Tata Institute of Fundamental Research|Boston Children's Hospital|Tata Institute of Fundamental Research|Tata Institute of Fundamental Research
limited interperson variability nutrient intake hampers epidemiologic studies dietdisease relationships despite conjecture nontraditional study bases providing large interperson differences virtually nothing known variations nutrient intake outside europe north america current study conducted india determine sources variability intakes nutrients thought public health importanceadult subjects gujarat north india n60 kerala south india n60 administered 24 h diet recall interviews six eight times respectively 1 period assess subject interperson residual intraperson contributions variance regression models fit data variance ratio vr total within intraperson total interperson computedrural communities north south indiain regions interperson variability larger observed west pronounced gujarat vr 10 seven 12 energyadjusted nutrient intakes men women analyses combined data region accounted 20 variance fat iron copper zinc betacarotene riboflavin men women region term removed model virtually variability ascribed region contributed interperson variabilitythe relatively large interperson variability observed could contribute improved resolution dietoutcome relationships epidemiologic studies applies data region especially evident analyses combined data