Conventional analyses of data from dietary validation studies may misestimate reporting accuracy: illustration from a study of the effect of interview modality on children's reporting accuracy.
OBJECTIVE
To compare two approaches to analysing energy- and nutrient-converted data from dietary validation (and relative validation) studies - conventional analyses, in which the accuracy of reported items is not ascertained, and reporting-error-sensitive analyses, in which reported items are classified as matches (items actually eaten) or intrusions (items not actually eaten), and reported amounts are classified as corresponding or overreported.


METHODS
Subjects were observed eating school breakfast and lunch, and interviewed that evening about that day's intake. For conventional analyses, reference and reported information were converted to energy and macronutrients; then t-tests, correlation coefficients and report rates (reported/reference) were calculated. For reporting error-sensitive analyses, reported items were classified as matches or intrusions, reported amounts were classified as corresponding or overreported, and correspondence rates (corresponding amount/reference amount) and inflation ratios (overreported amount/reference amount) were calculated.


METHODS
Sixty-nine fourth-grade children (35 girls) from 10 elementary schools in Georgia (USA).


RESULTS
For energy and each macronutrient, conventional analyses found that reported amounts were significantly less than reference amounts (every P < 0.021; paired t-tests); correlations between reported and reference amounts exceeded 0.52 (every P < 0.001); and median report rates ranged from 76% to 95%. Analyses sensitive to reporting errors found median correspondence rates between 67% and 79%, and that median inflation ratios, which ranged from 7% to 17%, differed significantly from 0 (every P < 0.0001; sign tests).


CONCLUSIONS
Conventional analyses of energy and nutrient data from dietary reporting validation (and relative validation) studies may overestimate accuracy and mask the complexity of dietary reporting error.
Smith
Albert F
AF
Department of Psychology, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA. a.f.smith@csuohio.edu
Domel Baxter
Suzanne
S
Hardin
James W
JW
Nichols
Michele D
MD
D015982:Bias; D002648:Child; D002664:Child Nutritional Physiological Phenomena; D002149:Energy Intake; D005260:Female; D005845:Georgia; D006801:Humans; D007407:Interviews as Topic / Q000592:standards*; D008297:Male; D009749:Nutrition Surveys; D012572:School Health Services; D054928:Validation Studies as Topic