Observational Health Data Sciences and Informatics

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===== NOTE_NLP table =====
**THIS IS OUTDATED. All documentation is now on the [[https://github.com/OHDSI/CommonDataModel/wiki|github wiki]]. Please refer there or to the [[projects:workgroups:cdm-wg|CDM working group]] for more information**

This table was added with version 5.2 (1-Feb-2017) of the OMOP CDM.

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The NOTE table encodes all output of NLP on clinical notes. Each row represents a single extracted term from a note.

^Field^Required^Type^Description^
|note_nlp_id|Yes|Big Integer|A unique identifier for each term extracted from a note.|
|note_id|Yes|integer|A foreign key to the Note table note the term was extracted from.|
|section_concept_id|No|integer|A foreign key to the predefined Concept in the Standardized Vocabularies representing the section of the extracted term.|
|snippet|No|string(250)|A small window of text surrounding the term.|
|offset|No|string(50)|Character offset of the extracted term in the input note.|
|lexical_variant|Yes|string(250)|Raw text extracted by the NLP tool.|
|note_nlp_concept_id|No|integer|Foreign key to Concept table. Represents the normalized concept for extracted term. Domain of the term is represented as part of the Concept table.|
|note_nlp_source_concept_id|No|integer|A foreign key to a Concept that refers to the code in the source vocabulary used by the NLP system.|
|nlp_system|No|string(250)|Name and version of the NLP system that extracted the term.|
|nlp_date|Yes|date|The date of the note processing.|
|nlp_date_time|No|datetime|The date and time of the note processing.|
|term_exists|No|Boolean|Term_exists is defined as a flag that indicates if the patient actually has or had the condition. Any of the following modifiers would make Term_exists false: Negation = true; Subject = [anything other than the patient]; Conditional = true; Rule_out = true; Uncertain = very low certainty or any lower certainties. A complete lack of modifiers would make Term_exists true. For the modifiers that are there, they would have to have these values: Negation = false; Subject = patient; Conditional = false; Rule_out = false; Uncertain = true or high or moderate or even low (could argue about low).|
|term_temporal|No|string(50)|Term_temporal is to indicate if a condition is “present” or just in the “past”. The following would be past: History = true; Concept_date = anything before the time of the report.|
|term_modifiers|No|string(2000)|Describes compactly all the modifiers extracted by nlp system. For example, “son has rash” → “negated=no,subject=family,certainty=undef,conditional=false,general=false”. Value will be saved as one of the modifiers.|