PPT Slide
Error sources in data handling process of the NNS-J, and possible measures for lessening the errors
- We examined error sources in both procedures, and described the frequency of errors and their effect on calculation of energy and nutrients intakes by using a sub-sample, 132 households including 445 family members, of the 1995 survey.
- The errors on coding the foods and the totally consumed amount, including no-coding for a specified food occurred at 1.61 per household, and those on coding the proportion shared by family members at 0.19 on the level of public health centers, respectively. Those frequencies at prefecture departments were 1.57 and 0.16 per household, respectively.
- This suggested the present data handling procedures were not satisfactory.
- In conclusion, we recommend that a new system for coding and data entry by use of personal computer software should be provided to public health centers. The system will have automatic error checking procedures by incorporating a food code list and upper limits for the acceptable values for each food.
Yoshiike N, et al. Journal of Japanese Society of Nutrition and Food Science1998;51(2): 57-65