{
    "participant_id": {
        "Description": "Unique participant identifier"
    },
    "age": {
        "Description": "Age of the participant in years",
        "Units": "years"
    },
    "sex": {
        "Description": "Sex of the participant (male, female, or n/a)"
    },
    "group": {
        "Description": "Clinical group"
    }
}