Nutrient intake variability and the number of days needed to estimate usual intake in children aged 13-32 months.
The number of days of data required to accurately estimate usual nutrient intake of children is not well established. This study aims to calculate the variability and the number of days required to estimate usual nutrient intake in children aged 13-32 months. This cross-sectional study, which is part of the BRISA Project in São Luís, Maranhão, Brazil, involved 231 children from April 2011 to January 2013. Socio-economic and demographic data were collected using a questionnaire, and 3 non-consecutive days of food consumption were collected using a 24-h dietary recall (24HDR) survey. Intrapersonal and interpersonal variability and variance ratio (VR) were obtained for each nutrient using the Multiple Source Method® program (version 1.0.1). The number of days (d) needed was calculated using the formula proposed by Black et al. for different correlation coefficients (r) (i.e. 0·7, 0·8 or 0·9). For the vast majority of nutrients, intrapersonal and interpersonal variability values of <1 were observed, with even smaller intrapersonal variabilities, resulting in low VR (<1). More days were needed to estimate intakes of soluble fibre (12), insoluble fibre (11), total fibre (10), vitamin C (9) and PUFA (7), while fewer days were needed for energy, carbohydrate, SFA, Ca, Fe, P and Zn (all had 2 d for r 0·9). However, most nutrients required one, two or three 24HDR for r 0·7, 0·8 or 0·9.
1Department of Public Health,Graduate Program in Public Health,Federal University of Maranhão,Street Itapary Baron,155,Centro,São Luís,Maranhão,CEP 65020-070,Brazil.
Luana L
LL
Padilha
1Department of Public Health,Graduate Program in Public Health,Federal University of Maranhão,Street Itapary Baron,155,Centro,São Luís,Maranhão,CEP 65020-070,Brazil.
Ana Karina T D C
AK
França
2Department of Physiological Sciences,Nutrition Course,Federal University of Maranhão,Avenue of the Portuguese,no. 1966,Bacanga,São Luís,Maranhão,CEP 65080-805,Brazil.
Sueli I O
SI
da Conceição
1Department of Public Health,Graduate Program in Public Health,Federal University of Maranhão,Street Itapary Baron,155,Centro,São Luís,Maranhão,CEP 65020-070,Brazil.
Wyllyane Rayana C
WR
Carvalho
1Department of Public Health,Graduate Program in Public Health,Federal University of Maranhão,Street Itapary Baron,155,Centro,São Luís,Maranhão,CEP 65020-070,Brazil.
Mônica A
MA
Batalha
1Department of Public Health,Graduate Program in Public Health,Federal University of Maranhão,Street Itapary Baron,155,Centro,São Luís,Maranhão,CEP 65020-070,Brazil.
Antônio A M
AA
da Silva
D001938:Brazil; D002664:Child Nutritional Physiological Phenomena; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D004032:Diet; D015930:Diet Records; D004034:Diet Surveys / Q000379:methods*; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena; D008297:Male; D013997:Time Factors
 24HDR 24-h dietary recall;  VR variance ratio; Children; Diet records; Nutrient intakes; Variations