{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Control+Letter&page=2",
    "query": {
      "intervention": "Control Letter",
      "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=Control+Letter&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-04T02:15:09.486Z",
  "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": "NCT01930149",
      "title": "Promoting Cholesterol Screening",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cardiovascular Diseases",
        "Lipid Testing",
        "Primary Prevention of Cardiovascular Disease"
      ],
      "interventions": [
        {
          "name": "Mailed patient outreach intervention",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "35 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "35 Years to 75 Years"
      },
      "enrollment_count": 480,
      "start_date": "2013-12",
      "completion_date": "2014-06",
      "has_results": false,
      "last_update_posted_date": "2014-09-29",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 3,
      "location_summary": "Flagstaff, Arizona • Chicago, Illinois",
      "locations": [
        {
          "city": "Flagstaff",
          "state": "Arizona"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01930149"
    },
    {
      "nct_id": "NCT00597103",
      "title": "Comparison of Dialysis Therapies on Cognitive Function",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "End Stage Renal Disease",
        "Chronic Kidney Disease"
      ],
      "interventions": [
        {
          "name": "Cognitive Function Testing-10 Tests",
          "type": "OTHER"
        },
        {
          "name": "Sleep Assessment Testing",
          "type": "OTHER"
        },
        {
          "name": "Periodic Leg Movement Syndrome Assessment",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Satellite Healthcare",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 17,
      "start_date": "2007-12",
      "completion_date": "2011-04-05",
      "has_results": false,
      "last_update_posted_date": "2019-04-18",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 2,
      "location_summary": "Mountain View, California",
      "locations": [
        {
          "city": "Mountain View",
          "state": "California"
        },
        {
          "city": "Mountain View",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00597103"
    },
    {
      "nct_id": "NCT00819182",
      "title": "Breathe for Hot Flashes Randomized Controlled Trial",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hot Flashes"
      ],
      "interventions": [
        {
          "name": "Paced respiration",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Sham comparator: fast shallow breathing",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Indiana University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 218,
      "start_date": "2008-04",
      "completion_date": "2013-02",
      "has_results": true,
      "last_update_posted_date": "2016-03-24",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "Indianapolis, Indiana",
      "locations": [
        {
          "city": "Indianapolis",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00819182"
    },
    {
      "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": "2026-09-04T02:15:09.486Z",
      "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": "NCT01852344",
      "title": "Behavioral Differences in Effortful Control",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Methylphenidate",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Easy Behavioral Task",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Hard Behavioral Task",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "DRUG",
        "BEHAVIORAL"
      ],
      "sponsor": "University of Michigan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "18 Years to 35 Years"
      },
      "enrollment_count": 108,
      "start_date": "2012-06",
      "completion_date": "2017-04-24",
      "has_results": true,
      "last_update_posted_date": "2018-01-08",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01852344"
    },
    {
      "nct_id": "NCT05000619",
      "title": "Encouraging Overdue Healthcare Appointment Scheduling Among Patients With Chronic Diseases",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Health Promotion",
        "Prevention",
        "Risk Reduction Behavior"
      ],
      "interventions": [
        {
          "name": "Outreach mailer",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Humor/Salience",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Doctor's authority",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Information",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Geisinger Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 21562,
      "start_date": "2021-07-12",
      "completion_date": "2022-08-26",
      "has_results": false,
      "last_update_posted_date": "2022-12-01",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "Danville, Pennsylvania",
      "locations": [
        {
          "city": "Danville",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05000619"
    },
    {
      "nct_id": "NCT04145934",
      "title": "A Randomized Controlled Trial of a Multicomponent Walking Aid Program for People With MS",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Multiple Sclerosis"
      ],
      "interventions": [
        {
          "name": "ADSTEP",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Oregon Health and Science University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 78,
      "start_date": "2020-02-06",
      "completion_date": "2023-01-26",
      "has_results": false,
      "last_update_posted_date": "2023-03-23",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04145934"
    },
    {
      "nct_id": "NCT01711385",
      "title": "Undiagnosed Diabetes in a Dental Setting",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Prediabetic State",
        "Type 2 Diabetes Mellitus With Oral Complications",
        "Periodontal Pocket",
        "Tooth Loss"
      ],
      "interventions": [
        {
          "name": "Enhanced intervention",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "30 Years and older"
      },
      "enrollment_count": 101,
      "start_date": "2009-04",
      "completion_date": "2013-06",
      "has_results": false,
      "last_update_posted_date": "2021-08-17",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01711385"
    },
    {
      "nct_id": "NCT04338750",
      "title": "Telephone Acceptance and Commitment Therapy Intervention for Caregivers of Adults With Dementia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Anxiety",
        "Anxiety Generalized",
        "Anxiety Disorders and Symptoms",
        "Caregiver Burnout"
      ],
      "interventions": [
        {
          "name": "Telephone Acceptance and Commitment Therapy Intervention for Caregivers",
          "type": "BEHAVIORAL"
        },
        {
          "name": "minimally-Enhanced Usual Care",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Indiana University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "21 Years and older"
      },
      "enrollment_count": 60,
      "start_date": "2020-03-24",
      "completion_date": "2021-04-09",
      "has_results": false,
      "last_update_posted_date": "2022-07-26",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "Indianapolis, Indiana",
      "locations": [
        {
          "city": "Indianapolis",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04338750"
    },
    {
      "nct_id": "NCT06516198",
      "title": "Auricular Acupressure in Prehabilitation",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Frailty",
        "Thoracic",
        "Prehabilitation",
        "Lung Surgery",
        "Wedge Resection",
        "Segmentectomy",
        "Lobectomy",
        "Pneumonectomy; Status"
      ],
      "interventions": [
        {
          "name": "Auricular Acupressure",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 40,
      "start_date": "2025-07-21",
      "completion_date": "2027-06-20",
      "has_results": false,
      "last_update_posted_date": "2025-12-09",
      "last_synced_at": "2026-09-04T02:15:09.486Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06516198"
    }
  ]
}