Validity of Nutrient Intake Estimates Using a Camera Phone Nutrition Management System -Inter-estimator Agreement-

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  • ケータイ栄養管理システムによる栄養素等推定量の妥当性 -推定者間の一致性-
  • ケータイ エイヨウ カンリ システム ニ ヨル エイヨウソ トウ スイテイリョウ ノ ダトウセイ スイテイシャ カン ノ イッチセイ

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Abstract

We developed a camera phone nutrition management system in which the user takes a picture of a meal with a camera phone and sends it to the management system, where a trained dietitian estimates the nutrients. To investigate the validity of this system, we had 10 university students take pictures of meals before eating using their mobile phones and send them with written notes to the camera phone nutrition management system for 3 days (breakfast, lunch, dinner). At the same time we conducted a weighing survey. The estimates of the amount of energy and nutrients based on the camera phone nutrition management system were made by 2 registered dietitians who had differences in experience in work where prior training in making such estimates was conducted. All energy and nutrients were log-transformed, and energy was adjusted using the method of residuals. With regard to the agreement between the estimates of the 2 estimators, the ratio between the 2 for the estimated intake of nutrients per day was 0.96–1.14, and the correlation coefficient after adjusting for energy was 0.84–0.98. The ratio between mean of the estimated intake of nutrients for the 2 estimators and the amount of intake by the weighing method was 0.91–1.43, and the correlation coefficient adjusted between the 2 methods was 0.53–0.87. The estimated nutrients from this system were obtained with a limited number of subjects and meals, but inter-estimator agreement was seen and generally good validity was obtained.

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