{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=5",
    "query": {
      "intervention": "Letter Intervention",
      "page": 5
    },
    "page_size": 10
  },
  "pagination": {
    "page": 5,
    "page_size": 10,
    "total_count": 261,
    "total_pages": 27,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=6&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=4&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-11T10:15:27.023Z",
  "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": "NCT03147547",
      "title": "Parent Engagement Package: Initial Testing of Strategies to Increase Participation in Parenting Interventions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Patient Compliance"
      ],
      "interventions": [
        {
          "name": "Promotional Brochure",
          "type": "OTHER"
        },
        {
          "name": "Family Testimonial Flyer",
          "type": "OTHER"
        },
        {
          "name": "Teacher Endorsement",
          "type": "OTHER"
        },
        {
          "name": "Provider Engagement Call",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Arizona State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 122,
      "start_date": "2009-01",
      "completion_date": "2010-05",
      "has_results": false,
      "last_update_posted_date": "2017-05-10",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "Tempe, Arizona",
      "locations": [
        {
          "city": "Tempe",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03147547"
    },
    {
      "nct_id": "NCT04683510",
      "title": "Awareness Enhancing Interventions",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Research Awareness"
      ],
      "interventions": [
        {
          "name": "Navigation - Study Specific - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Navigation - Study Specific - Cancer Survivor Voice",
          "type": "OTHER"
        },
        {
          "name": "Navigation - Research General - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Navigation - Research General - Cancer Survivor Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Study Specific - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Study Specific - Cancer Survivor Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Research General - Researcher Voice",
          "type": "OTHER"
        },
        {
          "name": "Brochure - Research General - Cancer Survivor Voice",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Tennessee",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 4451,
      "start_date": "2021-04-12",
      "completion_date": "2025-03-31",
      "has_results": true,
      "last_update_posted_date": "2025-05-04",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 2,
      "location_summary": "Birmingham, Alabama • Memphis, Tennessee",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04683510"
    },
    {
      "nct_id": "NCT06892275",
      "title": "The FYI on MRI: A Multilevel Decision Support Intervention for Screening Breast MRI",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Breast Neoplasm Female",
        "Early Detection of Cancer",
        "Hereditary Breast and Ovarian Cancer Syndrome",
        "Magnetic Resonance Imaging"
      ],
      "interventions": [
        {
          "name": "Enhanced Usual Care",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Decision Support",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Georgetown University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "74 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 74 Years · Female only"
      },
      "enrollment_count": 80,
      "start_date": "2025-06-01",
      "completion_date": "2027-12",
      "has_results": false,
      "last_update_posted_date": "2025-09-30",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "Washington D.C., District of Columbia",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06892275"
    },
    {
      "nct_id": "NCT02790476",
      "title": "Behavioral Insights to Encourage Judicious Prescribing of Opioids",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Substance-Related Disorders"
      ],
      "interventions": [
        {
          "name": "Letters",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 851,
      "start_date": "2017-01-27",
      "completion_date": "2018-02-27",
      "has_results": true,
      "last_update_posted_date": "2024-04-29",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "San Diego, California",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02790476"
    },
    {
      "nct_id": "NCT05295108",
      "title": "Caring Connections: A Program to Alleviate Social Isolation and Loneliness in Individuals Living With Spinal Cord Injury",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Spinal Cord Injuries and Disorders (SCI/D)"
      ],
      "interventions": [
        {
          "name": "Caring Connections",
          "type": "OTHER"
        },
        {
          "name": "Attention control",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Chicago Association for Research and Education in Science",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "18 Years to 90 Years"
      },
      "enrollment_count": 62,
      "start_date": "2023-06-22",
      "completion_date": "2025-01-01",
      "has_results": false,
      "last_update_posted_date": "2025-02-27",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "Hines, Illinois",
      "locations": [
        {
          "city": "Hines",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05295108"
    },
    {
      "nct_id": "NCT04164277",
      "title": "FirstStep2Health Intervention",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Pediatric Obesity",
        "Risk Reduction Behavior",
        "Early Intervention",
        "Intergenerational Relations"
      ],
      "interventions": [
        {
          "name": "Caregiver Component.",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Caregiver-Preschooler Learning.",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Center-based Preschooler Component.",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Michigan State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "3 Years",
        "maximum_age": "5 Years",
        "sex": "ALL",
        "summary": "3 Years to 5 Years"
      },
      "enrollment_count": 95,
      "start_date": "2021-09-20",
      "completion_date": "2023-08-31",
      "has_results": true,
      "last_update_posted_date": "2024-08-02",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "Lansing, Michigan",
      "locations": [
        {
          "city": "Lansing",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04164277"
    },
    {
      "nct_id": "NCT01763216",
      "title": "Improving Mood in Assisted Living Settings",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Depressive Symptoms",
        "Clinical Depression"
      ],
      "interventions": [
        {
          "name": "Road Tour",
          "type": "OTHER"
        },
        {
          "name": "Boatload of Crosswords",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Marianne Smith",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "55 Years and older"
      },
      "enrollment_count": 351,
      "start_date": "2013-02",
      "completion_date": "2020-11-06",
      "has_results": false,
      "last_update_posted_date": "2020-11-09",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 32,
      "location_summary": "Amana, Iowa • Bettendorf, Iowa • Carlisle, Iowa + 17 more",
      "locations": [
        {
          "city": "Amana",
          "state": "Iowa"
        },
        {
          "city": "Bettendorf",
          "state": "Iowa"
        },
        {
          "city": "Carlisle",
          "state": "Iowa"
        },
        {
          "city": "Cedar Falls",
          "state": "Iowa"
        },
        {
          "city": "Cedar Rapids",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01763216"
    },
    {
      "nct_id": "NCT07098845",
      "title": "Mindfulness-Based Intervention With a Supplement for Stress-Related Problems in College Students Across Multiple Sites (4SITE)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Stress",
        "Mental Health",
        "Mindfulness Based Stress Reduction"
      ],
      "interventions": [
        {
          "name": "Learning to BREATHE",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Learning to BREATHE Plus",
          "type": "BEHAVIORAL"
        },
        {
          "name": "HealthEd",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Colorado State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "25 Years",
        "sex": "ALL",
        "summary": "18 Years to 25 Years"
      },
      "enrollment_count": 120,
      "start_date": "2025-09-01",
      "completion_date": "2026-12",
      "has_results": false,
      "last_update_posted_date": "2026-06-10",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 4,
      "location_summary": "Denver, Colorado • Fort Collins, Colorado • Saint Paul, Minnesota",
      "locations": [
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Fort Collins",
          "state": "Colorado"
        },
        {
          "city": "Saint Paul",
          "state": "Minnesota"
        },
        {
          "city": "Saint Paul",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07098845"
    },
    {
      "nct_id": "NCT05348603",
      "title": "Electronic Health Record Strategies to Promote Diverse Participation in Research",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Patient Participation"
      ],
      "interventions": [
        {
          "name": "Traditional Letter",
          "type": "OTHER"
        },
        {
          "name": "Direct to Patient Message",
          "type": "OTHER"
        },
        {
          "name": "Chatbot",
          "type": "OTHER"
        },
        {
          "name": "Banner",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Yale University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 726199,
      "start_date": "2022-09-13",
      "completion_date": "2023-11-14",
      "has_results": false,
      "last_update_posted_date": "2023-12-11",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05348603"
    },
    {
      "nct_id": "NCT02399982",
      "title": "Smartphone Technology and CBT-GSH in Binge Eaters",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Binge Eating Disorder",
        "Bulimia Nervosa"
      ],
      "interventions": [
        {
          "name": "CBT-GSH",
          "type": "OTHER"
        },
        {
          "name": "Noom Monitor",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Icahn School of Medicine at Mount Sinai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 66,
      "start_date": "2013-02",
      "completion_date": "2016-03",
      "has_results": false,
      "last_update_posted_date": "2016-05-03",
      "last_synced_at": "2026-10-11T10:15:27.023Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02399982"
    }
  ]
}