Comparison study of food,energy and nutrient intake by 24-hour dietary recall method on two consecutive days versus three consecutive days
OBJECTIVE To compare the differences in estimated food,energy,and nutrient intakes between the consecutive 3 days 24-hour dietary recall(24HR)(referred to as the 3-day method)and consecutive 2 days 24HR(referred to as the 2-day method)to provide a basis for the use of consecutive 2 days 24HR in China nutrition surveillance.METHODS Using objective sampling to select participants in northern and southern provinces,dietary data were obtained through consecutive 3 days 24HR,and the average intakes of food,energy and nutrients were calculated for three days from Thursday to Saturday and two days on Friday and Saturday,respectively.The 3-day method was considered as the reference standard method to evaluate the performance of the 2-day method for estimating food,energy and nutrient intakes.RESULTS Among 778 participants aged 18-60 years in urban and rural areas of two provinces,the errors of the mean and median of 2-day method for estimating the intake of four major food categories less than 6％compared with the 3-day method,and there were significant equivalencies(P＜0.025)and no significant differences in four major food categories group(P＞0.05).Of the 24 food groups estimated by the 2-day method,17 had mean errors within 5％,the largest error was in animal offal(13.45％)and the smallest in fruit(0.15％),and there were significant equivalencies(P＜0.025)and no significant differences in seven food groups(P＞0.05).For energy and nutrients,the mean and median errors of energy were less than 0.5％and there were significant equivalencies(P＜0.025)and no significant differences for energy(P＞0.05).Among the 25 nutrients,except sodium,iodine and vitamin E,the mean and median errors of the other 22 nutrients were less than 5％,and there were significant equivalencies(P＜0.025)and no significant differences in 16 nutrients(P＞0.05).CONCLUSION There was little difference between the two survey method in assessing the intake of high consumption frequency foods,energy and most nutrients at group level,the 2-day method can be used as an alternative to the 3-day method to collect dietary intake data with high consumption rates in the population.
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