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Validation of a group 24-hour recall method for dietary assessment
Validation of a group twenty four hour recall method for dietary assessment
A group 24-hour recall method developed by the Expanded Food and Nutrition Education Program of Texas was validated in a population of low-income female food service workers using unobtrusive meal observation as a validation standard. All subjects were observed during one meal by trained observers. The following day, subjects either completed an individual or group multiple-pass recall. Nutrient analysis of data was completed using Food Processor version 7.14. Observational data and recall data for the corresponding meal were compared via paired t-tests and Pearson's correlation coefficients. Paired t-tests were completed using crude and log[e] transformed data. Results of t-tests indicated no significant differences between means of observational and recall data for either method for energy or any nutrient. Significant Pearson's correlation coefficients calculated for the group recall method ranged from 0.42 to 0.94. Significant correlation coefficients were noted for energy, carbohydrate, fiber, fat, thiamin, niacin, folate, and vitamins D and E. For the individual recall method, correlation coefficients ranged from 0.45 to 1.00. Significant correlation coefficients for the individual method were noted for carbohydrate, fat, cholesterol, riboflavin, folate, vitamins B6, B12, C, and D, and iron. Results of paired t-tests and calculated correlation coefficients indicated the validity of both recall methods. Subjects reported energy intake with the group recall method at 30 kcal/kg actual body weight while subjects completing individual recalls reported energy intake at 25 kcal/kg actual body weight. These data may suggest that group recall respondents reported energy intake more accurately than did individual recall respondents. Decreased feelings of social desirability among subjects completing the group recall method may have provided for more accurate reporting of energy intake. Statistical comparison of recall data to observational data indicates the validity of the group and individual recall methods. Thus, the group method could replace the more labor-intensive individual recall method to generate valid estimates of group intakes. This project was partially funded by the Expanded Food and Nutrition Education Program of Texas.
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Includes bibliographical references (leaves 131-177).