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PPI is a coding system for questionnaires and self-completed surveys, that is provided by the All of Us Research Program.
All PPI information is manually obtained from the All of Us PPI Codebook.
PPI Questionnaire layout consists of Modules, Topics, Questions, and Answers.
PPI source type value | Description |
---|---|
Module | A superior PPI entity representing a thematic set of topics, questions, and answers. Currently, the following Modules are available: 1) Consent PII 2) Refresher Consent 3) EHR Consent PII 4) Family History 5) Personal Medical History 6) Healthcare Access & Utilization 7) Lifestyle 8) Overall Health 9) The Basics 10 PMI |
Topic | A semantic module section containing a thematic set of questions or answers |
Question | A multiple-choice or open-ended question requesting information |
Answer | An answer representing a defined statement or free text |
PPI source names are represented in a “display” field. However, to avoid concept name duplicates, modified PPI names have been made through the parsing of their source codes (values of a “pmi_code” field). Original “display” values were put into the CONCEPT_SYNONYM table.
If a PPI concept has a standard LOINC or SNOMED equivalent, it is considered to be Non-standard. If a PPI concept does not have a standard LOINC or SNOMED equivalent, it is considered to be Standard.
PPI source type value | Concept Class | Domain |
---|---|---|
Module | Module | Observation |
Topic | Topic | Observation |
Question | Question | Observation |
Answer | Answer | Observation |
Protocol modification | PPI Modifier | Observation |
Physical measurement | Clinical Observation | Measurement |
A purpose of Internal PPI relationships is to build a PPI Hierarchy, which makes it easier to understand the relations between PPI concepts of different types.
A purpose of Internal of External PPI relationships is the following:
The PPI Hierarchical crosswalks include only standard concepts. A PPI standard concept value depends on the existence of an equivalent mapping either to the SNOMED or LOINC. In turn, a standard SNOMED/LOINC equivalent, if present, takes place of a non-standard PPI concept in the Internal PPI Hierarchy and adopts all its ancestors and descendants.