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documentation:next_cdm:multi_level_linkage

Food Component Table

  • Proposer: Clair Blacketer

Proposal

Add an optional table similar to the DRUG_STRENGTH table that would contain information about foods such as calories, fat, and sugar content. The specific use case I am thinking of is related to the NHANES dataset; a U.S. based survey that combines both health and nutrition information. I cannot currently store the nutrition information effectively because it would require two levels of association in any of the event tables. For example:

       Patient_id -> Date of Meal -> Food item consumed -> Calories in Food item
       Patient_id -> Date of Meal -> Food item consumed -> Grams of Fat in Food 
       

This file was taken straight from the NHANES website and shows how the dietary data are constructed. Using the current CDM and assuming they would be routed to the OBSERVATION table 'Respondent sequence number' is PERSON_ID and then 'USDA food code' is mapped to OBSERVATION_CONCEPT_ID (This also assumes that the food codes would be added to the vocabulary. If not, the food code would go in OBSERVATION_SOURCE_VALUE and OBSERVATION_CONCEPT_ID would be mapped to 0). The problem with this is then I would only be able to see what foods a person ate on a day but I would not know anything about those foods (grams, calories, protein, etc.).

My proposal is that we create an optional reference table similar to the DRUG_STRENGTH table to house this information. This would also require the addition of USDA food codes to the vocabulary, as well the addition of food attributes to the vocabulary.

FieldRequiredTypeDescription
food_concept_idYesintegerA foreign key to the Concept in the CONCEPT table representing the identifier for the USDA food code.
food_component_concept_idYesintegerA foreign key to the Concept in the CONCEPT table representing the identifier for the food component (fat, sugar, etc.).
amount_valueNofloatThe numeric value associated with the amount of the nutrient present in the food
amount_unit_concept_idNointegerA foreign key to the Concept in the CONCEPT table representing the identifier for the Unit for the absolute amount of the nutrient
valid_start_dateYesdateThe date when the food concept was first recorded
valid_end_dateYesdateThe date when the concept became invalid because it was deleted or superseded by a new Concept
invalid_reasonNointegerReason the concept was invalidated. Possible values are 'D' (deleted), 'U' (replaced with an update) or NULL when valid_end_date has the default value.
documentation/next_cdm/multi_level_linkage.txt · Last modified: 2017/03/01 17:06 by clairblacketer