The purpose of the study was to compare the 24-hour-recall method with the seven-day food-frequency questionnaire to estimate the dietary intake of vitamin A. Thirty-three women from a pert-urban neighbourhood in (Guatemala City were interviewed using both methods with a seven-day interval. The reproducibility of the results was analysed at both the individual and group levels. The 24-hour-recall method gave consistently higher average values for vitamin A intake, but the median was higher with the frequency method. The correlation coefficients between the repeated interviews were r = .49 for food frequency and r = -.07 for 24-hour-recalls. Diagnostic classification with the two methods was in good agreement at the 750-retinol-equivalents cut-off criterion for adequacy of vitamin A intake, but fell progressively as sequentially lower cutoffs were applied.
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