Reliability and validity of a computerized questionnaire to measure fat intake in Belgium

This study evaluated the reliability and validity of a Belgian computerized questionnaire to measure at intake. A total of 86 adults completed a 48-item computerized fat intake questionnaire, subseuently kept a 7-day diet record, and finally completed the questionnaire again. For validity, a Pearson orrelation of 0.67 for total fat intake and of 0.60 for percent energy from fat were found between the omputerized questionnaire and the diet records. Gross misclassification between the two methods as 5.8% for total fat intake and for percent energy from fat. Cohen’s values were respectively 0.27 nd 0.29. For reliability, intraclass correlation coefficients ranged from 0.70 to 0.87 between the two dministrations of the computerized fat intake questionnaire. Gross misclassification between the dministrations was 1.2% for total fat intake and for percent energy from fat, values were espectively 0.64 and 0.50. These results indicate that this fat intake questionnaire has an acceptable eliability and validity. © 2004 Elsevier Inc. All rights reserved.