{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Control+Letter",
    "query": {
      "intervention": "Control Letter"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 193,
    "total_pages": 20,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Control+Letter&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-03T07:13:02.378Z",
  "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": "NCT06598540",
      "title": "Comparison of Two Nutrition-Based Interventions on Physician Well-being",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Self-Compassion",
        "Self-care",
        "Self-care Agency",
        "Self-kindness",
        "Self-valuation"
      ],
      "interventions": [
        {
          "name": "Kindness-focused",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Health-focused",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 177,
      "start_date": "2025-03-15",
      "completion_date": "2025-07-20",
      "has_results": false,
      "last_update_posted_date": "2026-04-24",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Stanford, California",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06598540"
    },
    {
      "nct_id": "NCT05693701",
      "title": "Multicomponent Intervention Study- Blood Donors With High Cholesterol",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Lipid Metabolism Disorder"
      ],
      "interventions": [
        {
          "name": "Implementation Strategy Bundle",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Usual care notification",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL",
        "OTHER"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 100,
      "start_date": "2023-02-27",
      "completion_date": "2027-04-30",
      "has_results": false,
      "last_update_posted_date": "2026-03-17",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05693701"
    },
    {
      "nct_id": "NCT01427465",
      "title": "Brief Integrative Alcohol Interventions for Adolescents",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Alcohol Abuse",
        "Drug Abuse"
      ],
      "interventions": [
        {
          "name": "Brief Prevention Program Using Positive Image",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 0,
      "start_date": "2007-09",
      "completion_date": "2010-09",
      "has_results": false,
      "last_update_posted_date": "2011-11-22",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Jacksonville, Florida",
      "locations": [
        {
          "city": "Jacksonville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01427465"
    },
    {
      "nct_id": "NCT02172612",
      "title": "A Pilot Study to Reduce Inappropriate Anticholinergic Prescribing in the Elderly",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Alzheimer Disease"
      ],
      "interventions": [
        {
          "name": "Arm 1 Education Session",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Daniela Moga",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 50,
      "start_date": "2014-09",
      "completion_date": "2015-11-20",
      "has_results": false,
      "last_update_posted_date": "2019-03-29",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Lexington, Kentucky",
      "locations": [
        {
          "city": "Lexington",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02172612"
    },
    {
      "nct_id": "NCT02004145",
      "title": "Trial of a Positive Psychology Intervention in Major Depressive Disorder",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Major Depressive Disorder"
      ],
      "interventions": [
        {
          "name": "Positive Psychology",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control Condition",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 65,
      "start_date": "2013-10",
      "completion_date": "2015-09",
      "has_results": false,
      "last_update_posted_date": "2016-04-19",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02004145"
    },
    {
      "nct_id": "NCT06055972",
      "title": "Impact of Patient-Centered Approach for Communicating Coronary Calcium on Cardiovascular Health",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Coronary Artery Disease",
        "Cardiovascular Diseases",
        "Smoking"
      ],
      "interventions": [
        {
          "name": "Educational Letter Post CT Examination",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "American College of Radiology",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "50 Years to 80 Years"
      },
      "enrollment_count": 800,
      "start_date": "2023-12-19",
      "completion_date": "2025-02-02",
      "has_results": false,
      "last_update_posted_date": "2024-12-06",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 2,
      "location_summary": "Ann Arbor, Michigan • Seattle, Washington",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        },
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06055972"
    },
    {
      "nct_id": "NCT01918696",
      "title": "Controlled Evaluation of a Computerized Anger-reduction Treatment for Suicide Prevention",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Anger",
        "Suicidal Ideation"
      ],
      "interventions": [
        {
          "name": "Anger Reduction Treatment",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Progressive Muscle Relaxation",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control Condition",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Florida State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 120,
      "start_date": "2013-10",
      "completion_date": "2016-09",
      "has_results": false,
      "last_update_posted_date": "2021-01-29",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Tallahassee, Florida",
      "locations": [
        {
          "city": "Tallahassee",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01918696"
    },
    {
      "nct_id": "NCT04888169",
      "title": "Studying the Modification of Attention Bias Remotely After Trauma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Post Traumatic Stress Disorder"
      ],
      "interventions": [
        {
          "name": "SMART Mobile App - Attention Bias Modification",
          "type": "DEVICE"
        },
        {
          "name": "SMART Mobile App - Attention Control Training",
          "type": "DEVICE"
        },
        {
          "name": "SMART Mobile App - Placebo Training",
          "type": "DEVICE"
        },
        {
          "name": "SMART Mobile App - Control",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 1314,
      "start_date": "2023-04-20",
      "completion_date": "2025-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-07-23",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "San Francisco, California",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04888169"
    },
    {
      "nct_id": "NCT01251419",
      "title": "The Impact of Social Proximity on Conversion to Generic Prescription Medications",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Conversion From Brand Name to Generic Medication"
      ],
      "interventions": [
        {
          "name": "Social Proximity and Conversion to Generic Medications",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "National Bureau of Economic Research, Inc.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 10000,
      "start_date": "2011-03",
      "completion_date": "2012-05",
      "has_results": false,
      "last_update_posted_date": "2012-05-18",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "St Louis, Missouri",
      "locations": [
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01251419"
    },
    {
      "nct_id": "NCT01126034",
      "title": "Improving Metoclopramide Prescribing Practices at Penn Through a Physician-targeted Intervention",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Gastroesophageal Reflux Disease",
        "Diabetic Gastroparesis"
      ],
      "interventions": [
        {
          "name": "intervention letter",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 85,
      "start_date": "2007-03",
      "completion_date": "2008-04",
      "has_results": false,
      "last_update_posted_date": "2015-12-04",
      "last_synced_at": "2026-09-03T07:13:02.378Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01126034"
    }
  ]
}