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Pol. J. Food Nutr. Sci. 2004;54(3):313–320
The aim of this work was to compare the results of an evaluation of the eating habits of young people on the basis of single and triple dietary interviews. The research included 95 pupils from secondary schools, aged 13.1 years 0.04. The nutrient intake was estimated by the 24-h recall method. A triple dietary interview was carried out with each of the persons. The daily nutrient intake and the mean intake for three days were determined and, allowing for losses, compared with the recommended daily intakes on the safe level. The population percentage was calculated for four intake ranges (110% of the RDA). The variation in the intake estimation was expressed in % as the index (xn-xśr)100/xśr and determined by calculating the Pearson’s linear correlation coefficient. The population distribution in the consumption ranges was compared by means of the chi2 test. The variation in the nutrient intake estimation on the basis of a single dietary interview varied from –15% to +30% in girls and from –15% to +16% in boys. The correlation between the dietary recommended allowances in a triple interview (calculated as the mean for three days) and the values from single interviews varied from 0.49 to 0.91 in the first interview; from 0.61 to 0.90 in the second interview, and from 0.43 to 0.80 in the third interview. The population distributions in intake ranges did not differ significantly (p≥0.818). The percentage of people classified correctly to particular intake ranges in single interviews, in comparison with the classification carried out for the triple interview, varied from 44.2% to 85.3% of the population. The percentage of people classified incorrectly to the lower class ranged from 10.5% to 45.3%, and to the higher class – from 3.2% to 29.5%. With the exception of calcium, in all incompatible classification cases in single interviews the displacement of individual cases to the lower class, in comparison to the triple interview, was stated. A high correlation between single and triple dietary interviews in nutrient intake evaluation, and the lack of differences in the population distribution in intake ranges confirms the possibility of using the 24-h recall method in a single repetition for determining the eating habits of young people. In single interviews, in comparison with the triple interview, people were more often classified to a too low intake range than to a too high one. This indicates higher probability of obtaining unsatisfactory results as for the eating habits evaluation – lower on the basis of a single interview than a triple interview.