| Population | 0..* | — | A definition of a set of people that apply to some clinically related context, for example people contraindicated for a certain medication |
| .id | 0..1 | String | Unique id for inter-element referencing |
| .extension | 0..* | Extension | Additional content defined by implementations |
| .modifierExtension?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
| .age[x]Σ | 0..1 | Range | CodeableConcept | The age of the specific population |
| .genderΣ | 0..1 | CodeableConcept | The gender of the specific population |
| .raceΣ | 0..1 | CodeableConcept | Race of the specific population |
| .physiologicalConditionΣ | 0..1 | CodeableConcept | The existing physiological conditions of the specific population to which this applies |