{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=2",
    "query": {
      "intervention": "Letter Intervention",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 261,
    "total_pages": 27,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=3&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Letter+Intervention&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-12T19:12:59.495Z",
  "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": "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": "2026-10-05",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05693649"
    },
    {
      "nct_id": "NCT01831999",
      "title": "Clinical Monitoring to Facilitate Continuous Care for Substance Abusing Clients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Substance-Related Disorders",
        "Mental Disorders"
      ],
      "interventions": [
        {
          "name": "RecoveryTrack - Extended Care (RT-E)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Treatment Research Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 139,
      "start_date": "2012-06",
      "completion_date": "2016-05",
      "has_results": false,
      "last_update_posted_date": "2023-03-28",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 4,
      "location_summary": "Collingswood, New Jersey • Marlton, New Jersey • Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Collingswood",
          "state": "New Jersey"
        },
        {
          "city": "Marlton",
          "state": "New Jersey"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01831999"
    },
    {
      "nct_id": "NCT00414817",
      "title": "Telephone-Based Program to Promote Inhaled Corticosteroid Adherence Among Individuals With Asthma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Asthma"
      ],
      "interventions": [
        {
          "name": "Automated Phone-Based Refill Reminders",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Kaiser Permanente",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 14064,
      "start_date": "2007-06",
      "completion_date": "2009-10",
      "has_results": true,
      "last_update_posted_date": "2017-01-30",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 2,
      "location_summary": "Honolulu, Hawaii • Portland, Oregon",
      "locations": [
        {
          "city": "Honolulu",
          "state": "Hawaii"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00414817"
    },
    {
      "nct_id": "NCT05513274",
      "title": "Heartache and Backache- An Online Intervention Addressing Emotional and Physical Pain",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Pain (Back / Neck)"
      ],
      "interventions": [
        {
          "name": "Pain Psychology Neuroscience + Written Emotional Disclosure",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Pain Psychology Neuroscience + Healthy Habits Disclosure",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Health Behavior Control + Written Emotional Disclosure",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Health Behavior Control + Healthy Habits Disclosure",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Wayne State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "18 Years to 75 Years"
      },
      "enrollment_count": 107,
      "start_date": "2022-12-15",
      "completion_date": "2024-12-30",
      "has_results": false,
      "last_update_posted_date": "2025-07-16",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05513274"
    },
    {
      "nct_id": "NCT02864940",
      "title": "Memory Training in Aneurysmal Subarachnoid Hemorrhage Patients",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Ruptured Aneurysm",
        "Memory Deficits",
        "Subarachnoid Hemorrhage"
      ],
      "interventions": [
        {
          "name": "Lumosity",
          "type": "DEVICE"
        },
        {
          "name": "Crossword puzzle",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Rush University Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 38,
      "start_date": "2016-06",
      "completion_date": "2018-08-28",
      "has_results": true,
      "last_update_posted_date": "2023-04-10",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02864940"
    },
    {
      "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": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "Irvine, California",
      "locations": [
        {
          "city": "Irvine",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00086242"
    },
    {
      "nct_id": "NCT04558307",
      "title": "Feasibility of Rapid COVID-19 Testing in Disadvantaged Populations",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Coronavirus Disease (COVID-19)"
      ],
      "interventions": [
        {
          "name": "Pilot a rapid SARS-CoV-2 testing strategy",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "Community-driven messages to promote COVID-19 testing",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST",
        "OTHER"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1000,
      "start_date": "2020-06-03",
      "completion_date": "2021-06-01",
      "has_results": false,
      "last_update_posted_date": "2021-07-13",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04558307"
    },
    {
      "nct_id": "NCT05583877",
      "title": "DM-BOOST Para Latinx: a Diabetes Mellitus Program Using Behavioral Economics to Optimize Outreach and Self-management Support With Technology for Latinx Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Diabetes Mellitus, Type 2"
      ],
      "interventions": [
        {
          "name": "Diabetes BOOST",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Usual Care",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Daniel Amante",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2025-01-29",
      "completion_date": "2025-10-31",
      "has_results": false,
      "last_update_posted_date": "2026-03-03",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 2,
      "location_summary": "Worcester, Massachusetts",
      "locations": [
        {
          "city": "Worcester",
          "state": "Massachusetts"
        },
        {
          "city": "Worcester",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05583877"
    },
    {
      "nct_id": "NCT03414125",
      "title": "Effect of Mailed Invites of Choice of Colonoscopy or FIT vs. Mailed FIT Alone on Colorectal Cancer Screening",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Colorectal Cancer"
      ],
      "interventions": [
        {
          "name": "FIT Screening Strategy",
          "type": "OTHER"
        },
        {
          "name": "Choice Screening Strategy",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "63 Years",
        "sex": "ALL",
        "summary": "50 Years to 63 Years"
      },
      "enrollment_count": 26859,
      "start_date": "2018-09-07",
      "completion_date": "2021-08-31",
      "has_results": false,
      "last_update_posted_date": "2021-09-13",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03414125"
    },
    {
      "nct_id": "NCT01833026",
      "title": "COPD Assessment and Management Bundle Versus Usual Care",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chronic Obstructive Pulmonary Disease"
      ],
      "interventions": [
        {
          "name": "Spirometry test",
          "type": "DEVICE"
        },
        {
          "name": "Levalbuterol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "DRUG"
      ],
      "sponsor": "University of Illinois at Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "40 Years and older"
      },
      "enrollment_count": 56,
      "start_date": "2013-03",
      "completion_date": "2016-05",
      "has_results": true,
      "last_update_posted_date": "2019-12-24",
      "last_synced_at": "2026-10-12T19:12:59.495Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01833026"
    }
  ]
}