{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=4",
    "query": {
      "intervention": "Letter Intervention",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 261,
    "total_pages": 27,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-11T06:34:21.499Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT02572648",
      "title": "A Comparison of Magnetic Resonance Imaging in Persons With Heart Failure to Health, Aged Matched Controls",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Heart Failure"
      ],
      "interventions": [
        {
          "name": "Brain Imaging (Neuroimaging)",
          "type": "OTHER"
        },
        {
          "name": "Cognitive Function Assessment",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "40 Years to 75 Years"
      },
      "enrollment_count": 30,
      "start_date": "2015-10",
      "completion_date": "2017-08",
      "has_results": false,
      "last_update_posted_date": "2017-09-21",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 3,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02572648"
    },
    {
      "nct_id": "NCT03929926",
      "title": "Proactive Outreach and Shared Decision Making in Improving Lung Cancer Screening Rates in Primary Care Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Lung Cancer"
      ],
      "interventions": [
        {
          "name": "Best Practice",
          "type": "OTHER"
        },
        {
          "name": "Cancer Educational Materials",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Behavioral, Psychological or Informational Intervention",
          "type": "OTHER"
        },
        {
          "name": "Counseling",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "BEHAVIORAL"
      ],
      "sponsor": "Thomas Jefferson University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "55 Years to 80 Years"
      },
      "enrollment_count": 2355,
      "start_date": "2019-06-19",
      "completion_date": "2024-05-01",
      "has_results": false,
      "last_update_posted_date": "2025-05-20",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03929926"
    },
    {
      "nct_id": "NCT06327074",
      "title": "Testing the Engaged Approach to Lung Cancer Screening",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Lung Cancer"
      ],
      "interventions": [
        {
          "name": "Engaged Approach to Lung Cancer Screening",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 40,
      "start_date": "2024-03-11",
      "completion_date": "2026-12",
      "has_results": false,
      "last_update_posted_date": "2025-12-22",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Denver, Colorado",
      "locations": [
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06327074"
    },
    {
      "nct_id": "NCT06569290",
      "title": "Refinement and Testing of Recruitment Methodology for Behavioral Medication Adherence Interventions Using Behavioral Science-based Approaches",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Diabetes",
        "Pharmacist-Patient Relations",
        "Medication Adherence"
      ],
      "interventions": [
        {
          "name": "Primer postcard",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control recruitment letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Behavioral theory-informed recruitment letter (prospect theory)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "2 phone calls",
          "type": "BEHAVIORAL"
        },
        {
          "name": "4 phone calls",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 590,
      "start_date": "2025-03-03",
      "completion_date": "2026-06-15",
      "has_results": false,
      "last_update_posted_date": "2026-07-07",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06569290"
    },
    {
      "nct_id": "NCT07345676",
      "title": "Colorectal Cancer Screening Outreach",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colo-rectal Cancer"
      ],
      "interventions": [
        {
          "name": "Bundled messaging intervention",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Yale University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "45 Years to 75 Years"
      },
      "enrollment_count": 2000,
      "start_date": "2026-06-23",
      "completion_date": "2027-07",
      "has_results": false,
      "last_update_posted_date": "2026-07-07",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07345676"
    },
    {
      "nct_id": "NCT00113633",
      "title": "Educational Video for Improving Follow-up After an Emergency Department Visit for Asthma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Asthma"
      ],
      "interventions": [
        {
          "name": "Intervention Subjects",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Children's Hospital of Philadelphia",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "1 Year",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "1 Year to 18 Years"
      },
      "enrollment_count": 439,
      "start_date": "2003-09",
      "completion_date": "2006-06",
      "has_results": false,
      "last_update_posted_date": "2014-03-04",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00113633"
    },
    {
      "nct_id": "NCT01336361",
      "title": "Emerging Physical Therapy Practice in Palliative Care: A Survey of Perceptions of Physical Therapists",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Perception"
      ],
      "interventions": [
        {
          "name": "Survey",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Montana",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 228,
      "start_date": "2011-04",
      "completion_date": "2011-05",
      "has_results": false,
      "last_update_posted_date": "2014-09-17",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Missoula, Montana",
      "locations": [
        {
          "city": "Missoula",
          "state": "Montana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01336361"
    },
    {
      "nct_id": "NCT04852055",
      "title": "Effect of an Advance Care Planning Intervention",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Dementia"
      ],
      "interventions": [
        {
          "name": "Advance Care Planning Video",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brown University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 2364,
      "start_date": "2021-03-30",
      "completion_date": "2022-03-23",
      "has_results": true,
      "last_update_posted_date": "2025-11-04",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Stillwater, Minnesota",
      "locations": [
        {
          "city": "Stillwater",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04852055"
    },
    {
      "nct_id": "NCT01507662",
      "title": "Patient Activation After DXA Result Notification",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Osteoporosis",
        "Bone Diseases, Metabolic"
      ],
      "interventions": [
        {
          "name": "Bone Mineral Density Result Letter and Bone Health Brochure",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Fredric D Wolinsky",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 7749,
      "start_date": "2012-02",
      "completion_date": "2015-11",
      "has_results": true,
      "last_update_posted_date": "2020-11-10",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 3,
      "location_summary": "Birmingham, Alabama • Atlanta, Georgia • Iowa City, Iowa",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01507662"
    },
    {
      "nct_id": "NCT03626402",
      "title": "End-of-Life Care for African Americans: An Outpatient Intervention",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Advance Care Planning"
      ],
      "interventions": [
        {
          "name": "Planning for the Care You Want",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 72,
      "start_date": "2017-04-01",
      "completion_date": "2023-06-01",
      "has_results": false,
      "last_update_posted_date": "2023-09-07",
      "last_synced_at": "2026-10-11T06:34:21.499Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03626402"
    }
  ]
}