{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Only",
    "query": {
      "intervention": "Letter Only"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 82,
    "total_pages": 9,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Only&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-10T22:57:37.246Z",
  "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": "NCT01332032",
      "title": "Promoting Breast Cancer Screening in Non-adherent Women",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Reminder Letter",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Reminder Call",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Counselor Call",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Massachusetts, Worcester",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "84 Years",
        "sex": "FEMALE",
        "summary": "40 Years to 84 Years · Female only"
      },
      "enrollment_count": 36348,
      "start_date": "2009-07",
      "completion_date": "2015-05",
      "has_results": false,
      "last_update_posted_date": "2015-06-01",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 1,
      "location_summary": "Worcester, Massachusetts",
      "locations": [
        {
          "city": "Worcester",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01332032"
    },
    {
      "nct_id": "NCT00086242",
      "title": "Telephone Counseling or Standard Care in Patients Who Have Completed Treatment for Stages I, II, or III Cervical Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cervical Cancer",
        "Psychosocial Effects of Cancer and Its Treatment"
      ],
      "interventions": [
        {
          "name": "Psychosocial Telephone Counseling (PTC)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of California, Irvine",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 120 Years · Female only"
      },
      "enrollment_count": 36,
      "start_date": "2004-08-01",
      "completion_date": "2007-06-30",
      "has_results": false,
      "last_update_posted_date": "2019-03-08",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 1,
      "location_summary": "Irvine, California",
      "locations": [
        {
          "city": "Irvine",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00086242"
    },
    {
      "nct_id": "NCT01993017",
      "title": "Comparison of Depression Identification After Acute Coronary Syndrome: Quality of Life and Cost Outcomes",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Acute Coronary Syndrome",
        "Depressive Symptoms"
      ],
      "interventions": [
        {
          "name": "Cognitive Behavioral Therapy (CBT)",
          "type": "OTHER"
        },
        {
          "name": "Antidepressant Medication",
          "type": "DRUG"
        },
        {
          "name": "Standard Care",
          "type": "OTHER"
        },
        {
          "name": "Depressive symptom screener",
          "type": "OTHER"
        },
        {
          "name": "No intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 1501,
      "start_date": "2013-11",
      "completion_date": "2019-07-31",
      "has_results": true,
      "last_update_posted_date": "2023-04-14",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 4,
      "location_summary": "Bloomington, Minnesota • New York, New York • Henderson, North Carolina + 1 more",
      "locations": [
        {
          "city": "Bloomington",
          "state": "Minnesota"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Henderson",
          "state": "North Carolina"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01993017"
    },
    {
      "nct_id": "NCT05894967",
      "title": "Moderators and Mediators of Perceptual Learning",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cognitive Change"
      ],
      "interventions": [
        {
          "name": "C1 - Standard Perceptual Learning (SPL)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C2 - Long Training (LT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C3 - Short Staircases (SS)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C4 - Mixed Difficulty (MD)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C5 - Noise Training (NT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C6 - Training with Flankers (TWF)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C7 - Parafoveal Training (PT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C8 - Stimulus Variety (SV)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C8a - Complex Features (CF)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C9 - Exogenous Attention Training (ExAT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C10 - Endogenous Attention Training (EnAT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "C11 - Multisensory Facilitation (MF)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "No Contact Control",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "18 Years to 85 Years"
      },
      "enrollment_count": 1140,
      "start_date": "2023-04-14",
      "completion_date": "2027-03-31",
      "has_results": false,
      "last_update_posted_date": "2025-12-15",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 3,
      "location_summary": "Riverside, California • Boston, Massachusetts • Madison, Wisconsin",
      "locations": [
        {
          "city": "Riverside",
          "state": "California"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05894967"
    },
    {
      "nct_id": "NCT05724615",
      "title": "Default Bulk Ordering and Text Messaging to Enhance Outreach for Lipid Screening (Missing Lipids)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Atherosclerotic Cardiovascular Disease"
      ],
      "interventions": [
        {
          "name": "Outreach + Bulk ordering",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Outreach + Bulk ordering + Text Based Reminders and Scheduling assistance",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "20 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "20 Years to 75 Years"
      },
      "enrollment_count": 1000,
      "start_date": "2023-06-05",
      "completion_date": "2023-12-07",
      "has_results": false,
      "last_update_posted_date": "2024-01-05",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05724615"
    },
    {
      "nct_id": "NCT06678178",
      "title": "Climate Impact Label Design and Fast-Food Meal Selection",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Food Selection"
      ],
      "interventions": [
        {
          "name": "Control (QR) Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Warning High Climate Impact Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Traffic Light Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Climate Grade Labels",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Numeric Carbon Footprint 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": 6622,
      "start_date": "2024-12-02",
      "completion_date": "2024-12-06",
      "has_results": true,
      "last_update_posted_date": "2026-01-06",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06678178"
    },
    {
      "nct_id": "NCT01515943",
      "title": "Convergence Insufficiency Treatment Study (CITS)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Convergence Insufficiency"
      ],
      "interventions": [
        {
          "name": "Active home-based computer vergence/accommodative therapy",
          "type": "OTHER"
        },
        {
          "name": "Near target push-ups",
          "type": "PROCEDURE"
        },
        {
          "name": "Placebo home-based computer vergence/accommodative therapy",
          "type": "OTHER"
        },
        {
          "name": "Placebo yoked prism flippers",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Jaeb Center for Health Research",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "9 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "9 Years to 17 Years"
      },
      "enrollment_count": 204,
      "start_date": "2012-06",
      "completion_date": "2015-01",
      "has_results": true,
      "last_update_posted_date": "2017-04-12",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 2,
      "location_summary": "Cranberry TWP, Pennsylvania • Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Cranberry TWP",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01515943"
    },
    {
      "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": "2026-09-10T22:57:37.246Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00746668"
    },
    {
      "nct_id": "NCT01603316",
      "title": "Food: A Three-Arm Study Examining Food Insecurity Interventions",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Cancer Patients"
      ],
      "interventions": [
        {
          "name": "surveys",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Focus groups",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Memorial Sloan Kettering Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 606,
      "start_date": "2012-05-08",
      "completion_date": "2027-05",
      "has_results": false,
      "last_update_posted_date": "2026-06-09",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 10,
      "location_summary": "Brooklyn, New York • Jamaica, New York • New York, New York + 1 more",
      "locations": [
        {
          "city": "Brooklyn",
          "state": "New York"
        },
        {
          "city": "Jamaica",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01603316"
    },
    {
      "nct_id": "NCT04199117",
      "title": "Health Systems Reach Interventions Project",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Smoking, Cigarette",
        "Smoking Cessation"
      ],
      "interventions": [
        {
          "name": "Varenicline",
          "type": "DRUG"
        },
        {
          "name": "Combination nicotine patch and nicotine mini-lozenge treatment",
          "type": "DRUG"
        },
        {
          "name": "Monetary incentives for initiating treatment",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Automated tailored outreach",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Care management",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Wisconsin Tobacco Quit Line referral",
          "type": "OTHER"
        },
        {
          "name": "Primary care provider referral",
          "type": "OTHER"
        },
        {
          "name": "Untailored outreach",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Multiple smoking cessation coaching calls",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "DRUG",
        "BEHAVIORAL",
        "OTHER"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 210,
      "start_date": "2020-03-11",
      "completion_date": "2024-10-16",
      "has_results": true,
      "last_update_posted_date": "2025-09-24",
      "last_synced_at": "2026-09-10T22:57:37.246Z",
      "location_count": 1,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04199117"
    }
  ]
}