{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Only&page=2",
    "query": {
      "intervention": "Letter Only",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Only&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-15T06:03:46.697Z",
  "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": "NCT02243774",
      "title": "Mail Outreach To Increase Vaccination Acceptance Through Engagement",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Influenza, Human",
        "Influenza",
        "Human Flu"
      ],
      "interventions": [
        {
          "name": "Core letter signed by Surgeon General",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Core letter signed by the Director of the National Vaccine Program",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Core letter signed by Surgeon General + implementation prompt",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Core letter signed by SG + enhanced implementation prompt",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "66 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "66 Years and older"
      },
      "enrollment_count": 228000,
      "start_date": "2014-09",
      "completion_date": "2015-09",
      "has_results": false,
      "last_update_posted_date": "2017-07-12",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02243774"
    },
    {
      "nct_id": "NCT03349411",
      "title": "Spatial Neglect and Delirium After Stroke",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Stroke",
        "Delirium",
        "Spatial Neglect"
      ],
      "interventions": [
        {
          "name": "Confusion Assessment Method",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Behavioral Inattention Test",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Florida Mental Status Examination",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Montreal Cognitive Assessment",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Geriatric Depression Scale",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Kessler Foundation Neglect Assessment Process",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Kessler Foundation",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 45,
      "start_date": "2017-07-18",
      "completion_date": "2020-12-30",
      "has_results": false,
      "last_update_posted_date": "2021-04-30",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 2,
      "location_summary": "West Orange, New Jersey • New York, New York",
      "locations": [
        {
          "city": "West Orange",
          "state": "New Jersey"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03349411"
    },
    {
      "nct_id": "NCT05912842",
      "title": "Forging Sustainable Solutions for HIV Continuity of Care Through Medical-legal Partnerships",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Organizational Partnerships for Healthy Living",
        "Standard of Care"
      ],
      "interventions": [
        {
          "name": "Organizational Partnerships for Healthy Living",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Standard of Care",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Temple University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 200,
      "start_date": "2022-10-01",
      "completion_date": "2024-06",
      "has_results": false,
      "last_update_posted_date": "2023-06-23",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05912842"
    },
    {
      "nct_id": "NCT05693649",
      "title": "Behavioral Economic Approaches for Population-Based Colorectal Cancer Screening",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer"
      ],
      "interventions": [
        {
          "name": "No Direct Patient Outreach",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Direct Patient Outreach: Colonoscopy Only",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Direct Patient Outreach: Sequential Choice",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Visit-Based Nudge/Text",
          "type": "BEHAVIORAL"
        },
        {
          "name": "No Nudge/Text",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Abramson Cancer Center at Penn Medicine",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "72 Years",
        "sex": "ALL",
        "summary": "50 Years to 72 Years"
      },
      "enrollment_count": 20000,
      "start_date": "2023-06-07",
      "completion_date": "2026-12-21",
      "has_results": false,
      "last_update_posted_date": "2025-09-05",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05693649"
    },
    {
      "nct_id": "NCT01079533",
      "title": "Initiation of Colon Cancer Screening in Veterans or \"Start Screening Now\"",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Neoplasms"
      ],
      "interventions": [
        {
          "name": "Stepped CRCS Interventions",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "The University of Texas Health Science Center, Houston",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "50 Years to 64 Years"
      },
      "enrollment_count": 1892,
      "start_date": "2008-07",
      "completion_date": "2014-07-31",
      "has_results": false,
      "last_update_posted_date": "2017-05-03",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01079533"
    },
    {
      "nct_id": "NCT02876926",
      "title": "Evaluating a Real-Time, Remote Monitoring System for Home-Based HIV Testing",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "HIV"
      ],
      "interventions": [
        {
          "name": "\"Smart\" home-based test for HIV",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Home-based testing only",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Reminder letters for clinic-based testing",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brown University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 65,
      "start_date": "2016-07",
      "completion_date": "2018-02-15",
      "has_results": true,
      "last_update_posted_date": "2019-04-19",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Providence, Rhode Island",
      "locations": [
        {
          "city": "Providence",
          "state": "Rhode Island"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02876926"
    },
    {
      "nct_id": "NCT03853213",
      "title": "Investigating Fear Of Recurrence as a Modifiable Mechanism of Behavior Change",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Acute Coronary Syndrome",
        "Fear",
        "Medication Adherence"
      ],
      "interventions": [
        {
          "name": "Cognitive Bias Modification Training",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Attention Control Training",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 26,
      "start_date": "2019-03-28",
      "completion_date": "2020-07-31",
      "has_results": true,
      "last_update_posted_date": "2021-09-17",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03853213"
    },
    {
      "nct_id": "NCT03300180",
      "title": "Caregiver Outcomes of Alzheimer's Disease Screening",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Alzheimer Disease"
      ],
      "interventions": [
        {
          "name": "Collaborative Dementia Care Program",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Screening Only",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL",
        "OTHER"
      ],
      "sponsor": "Indiana University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 1822,
      "start_date": "2018-10-15",
      "completion_date": "2023-09-30",
      "has_results": true,
      "last_update_posted_date": "2025-05-02",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 2,
      "location_summary": "Indianapolis, Indiana",
      "locations": [
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03300180"
    },
    {
      "nct_id": "NCT07536126",
      "title": "Testing Non-Nutrition Menu Labels on Food Selections",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Food Selection"
      ],
      "interventions": [
        {
          "name": "Control (QR) Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Low Environmental Harm Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "High Environmental Harm Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Environmental Harm Traffic Light Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Environmental Grade Labels",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Johns Hopkins Bloomberg School of Public Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 7000,
      "start_date": "2026-04-13",
      "completion_date": "2026-05-04",
      "has_results": false,
      "last_update_posted_date": "2026-06-12",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07536126"
    },
    {
      "nct_id": "NCT00746668",
      "title": "A Multi-Center Study of Reading Rehabilitation in Macular Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Age Related Maculopathy",
        "Retinal Degeneration"
      ],
      "interventions": [
        {
          "name": "Module 1: Visual Awareness and Eccentric Viewing",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Module 2: Control of Reading Eye Movements",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Module 3: Reading Practice with RSVP",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "US Department of Veterans Affairs",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 36,
      "start_date": "2008-08",
      "completion_date": "2012-09",
      "has_results": true,
      "last_update_posted_date": "2015-02-27",
      "last_synced_at": "2026-09-15T06:03:46.697Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00746668"
    }
  ]
}