title: Comparison of the National Nutritional Survey in Japan estimated individual-based nutritional data and NIPPON DATA80 food frequency questionnaires.
abstract: BACKGROUND
  The National Nutritional Survey in Japan (NNSJ) was initiated in 1946. Using the majority of the participants for NNSJ, the National Survey on Circulatory Disorders has been conducted every 10 year since 1960. We performed a comparative study of the NNSJ80 estimated individual-based nutritional data by comparing those with NIPPON DATA80 food frequency questionnaires (FFQ) data.
  
  
  METHODS
  A total of 10 546 community residents from 300 randomly selected districts participated in the both surveys in 1980. At baseline, history, physical, and blood biochemical measurement and a nutritional survey by FFQ were performed individually. From household-based NNSJ80 data, we estimated nutrient intakes of each household member by dividing household intake data proportionally using average intakes by sex and age groups calculated for NNSJ95. We re-categorized NNSJ80 estimated data to correspond to NIPPON DATA80 FFQ categories. Data were analyzed in men and women separately.
  
  
  RESULTS
  Cross tables showed fairly good agreement of the two categories. The majorities of participants situated on the diagonally aligned cells or the next to them. Weighted kappa ranged from 0.152 to 0.241. Spearman's rank correlation coefficients between the two categories ranged from 0.224 to 0.338, and those between NNSJ80 continuous data and NIPPON DATA80 categorical data ranged from 0.237 to 0.354. All these values have P < 0.001.
  
  
  CONCLUSIONS
  These results may indicate that the present nutritional estimation method is applicable to, further studies.
authors.affiliation: Cardiovascular Epidemiology, Kyoto Women's University, Kyoto, Japan. nakamury@kyoto-wu.ac.jp
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Nagako
authors.initials: N
authors.lastname: Okuda
authors.forename: Tanvir Chowdhury
authors.initials: TC
authors.lastname: Turin
authors.forename: Akira
authors.initials: A
authors.lastname: Fujiyoshi
authors.forename: Tomonori
authors.initials: T
authors.lastname: Okamura
authors.forename: Takehito
authors.initials: T
authors.lastname: Hayakawa
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Matsumura
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Miura
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Ueshima
mesh_terms: D000328:Adult; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D004032:Diet / Q000706:statistics & numerical data*; D005260:Female; D006306:Health Surveys; D006801:Humans; D007564:Japan; D008297:Male; D015596:Nutrition Assessment; D009749:Nutrition Surveys; D015203:Reproducibility of Results; D012111:Residence Characteristics; D011795:Surveys and Questionnaires