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IPD Source Information

Methodology Overview

Our analysts review hundreds of medical journals, trade journals, audits, on-line databases, registries, and market investment reports each month and summarize the data into our Article Reviews. Full source citations are provided for each review. We also compile data from the most recent surveys of the National Center for Health Statistics (NCHS) in our Trend Data reports.

Our analysts go beyond our core sources to constantly monitor larger disease areas and areas in which the data is hard to find. In addition, we are conducting on-going special searches for subscribers that require much broader and more specialized searches.

Article Review Sources

Journals

The majority of these 284 journals are reviewed on an ongoing basis; the remainder are reviewed periodically.

Acta Neurologica Scandinavica
Acta Oto-Laryngologica
Acta Paediatrica
AIDS American Family Physician
Alimentary Pharmacology and Therapeutics
Allergy: European Journal of Allergy and Clinical Immunology
Allergology International
American Heart Journal
American Journal of Cardiology
American Journal of Clinical Nutrition
American Journal of Emergency Medicine
American Journal of Epidemiology
American Journal of Gastroenterology
American Journal of Health-System Pharmacy
American Journal of Human Genetics
American Journal of Kidney Diseases
American Journal of Managed Care
American Journal of Medicine
American Journal of Obstetrics and Gynecology
American Journal of Ophthalmology
American Journal of Pathology
American Journal of Physical Medicine and Rehabilitation
American Journal of Psychiatry
American Journal of Public Health
American Journal of Respiratory and Critical Care Medicine
American Journal of Roentgenology
American Journal of Surgery
American Journal of Surgical Pathology
American Journal of the Medical Sciences
American Journal of Tropical Medicine and Hygiene
American Optometric Association News
Anesthesia and Analgesia
Anesthesiology
Angiology
Annals of Allergy, Asthma, and Immunology
Annals of Emergency Medicine
Annals of Epidemiology
Annals of General Psychiatry
Annals of Internal Medicine
Annals of Neurology
Annals of Oncology
Annals of Otology, Rhinology, and Laryngology
Annals of Surgery
Annals of the Rheumatic Diseases
Annals of Thoracic Surgery
Antimicrobial Agents and Chemotherapy
Archives of Dermatology
Archives of Disease in Childhood
Archives of Disease in Childhood (Fetal and Neonatal Edition)
Archives of Environmental Health
Archives of General Psychiatry
Archives of Internal Medicine
Archives of Neurology
Archives of Ophthalmology
Archives of Otolaryngology -- Head and Neck Surgery
Archives of Pediatrics and Adolescent Medicine
Archives of Physical Medicine and Rehabilitation
Archives of Surgery
Arthritis and Rheumatism
Arthritis Care and Research
Arthritis Research and Therapy
Asia Pacific Journal of Clinical Oncology
BJU International
Blood
BMC Cancer
BMC Cardiovascular Disorders
BMC Dermatology
BMC Ear, Nose, and Throat Disorders
BMC Endocrine Disorders
BMC Gastroenterology
BMC Geriatrics
BMC Medicine
BMC Musculoskeletal Disorders
BMC Nephrology
BMC Neurology
BMC Ophthalmology
BMC Pediatrics
BMC Psychiatry
BMC Pulmonary Medicine
BMC Urology
Bone Marrow Transplantation
Brain
British Journal of Anaesthesia
British Journal of Dermatology
British Journal of Haematology
British Journal of Obstetrics and Gynaecology
British Journal of Ophthalmology
British Journal of Psychiatry
British Journal of Surgery
British Medical Journal
Bulletin Epidemiologique Hebdomadaire
Bulletin of the World Health Organization
CA -- A Cancer Journal for Clinicians
Canadian Medical Association Journal
Cancer
Cancer Treatment Reviews
Cardiovascular Research
Chest
Chinese Medical Journal
Circulation
Circulation Journal
Cleveland Clinic Journal of Medicine
Clinical Endocrinology
Clinical Genetics
Clinical Infectious Diseases
Clinical Nephrology
Clinical Pediatrics
Clinical Perspectives in Gastroenterology
Clinical Radiology
Comprehensive Psychiatry
Contact Lens Spectrum
Critical Care Medicine
Current Therapeutic Research
Diabetes
Diabetes Care
Diabetologia
Digestive Diseases and Sciences
Diseases of the Colon and Rectum
Emergency Medicine
Emergency Physicians' Monthly
Emerging Infectious Diseases
Endocrine Reviews
Epidemiology and Infection
European Archives of Psychiatry and Clinical Neuroscience
European Clinical Microbiology and Infectious Diseases
European Heart Journal
European Journal of Cancer
European Journal of Epidemiology
European Journal of Gastroenterology and Hepatology
European Journal of Heart Failure
European Journal of Pain
European Journal of Pediatrics
European Psychiatry
European Neurology
European Respiratory Journal
European Spine Journal
Eurosurveillance Quarterly Print Compilation
Family Planning Perspectives
Fertility and Sterility
Gastroenterology
Geriatrics
Gut
Gynecologic Oncology
Health Affairs
Health Protection Report (England and Wales)
Heart
Hepatology
HIV/AIDS Surveillance Report
Hospitals and Health Networks
Hypertension
Infection Control and Hospital Epidemiology
International Archives of Allergy and Immunology
International Heart Journal
International Journal of Cancer
International Journal of Cancer (Radiat Oncol Invest)
International Journal of Dermatology
International Journal of Epidemiology
International Journal of Gynecology and Obstetrics
International Journal of Obesity
International Journal of Radiation Oncology, Biology, Physiology
International Journal STD and AIDS
International Journal of Stroke
International Journal of the Medical Sciences
International Journal of Urology
International Wound Journal
Investigative Ophthalmology and Visual Science
Investigative Radiology
Journal of Allergy and Clinical Immunology
Journal of Bone and Joint Surgery (American volume)
Journal of Bone and Joint Surgery (British volume)
Journal of Bone and Mineral Research
Journal of Clinical Endocrinology and Metabolism
Journal of Clinical Epidemiology
Journal of Clinical Microbiology
Journal of Clinical Oncology
Journal of Clinical Pathology
Journal of Clinical Psychiatry
Journal of Epidemiology and Community Health
Journal of Family Practice
Journal of Gerontology
Journal of Gerontology: Medical Sciences
Journal of Infectious Diseases
Journal of Internal Medicine
Journal of Medical Genetics
Journal of Nervous and Mental Disease
Journal of Neurology
Journal of Neurology, Neurosurgery, and Psychiatry
Journal of Neurosurgery
Journal of Neurosurgery (Spine 1)
Journal of Nutrition
Journal of Obstetrics and Gynaecology
Journal of Oral and Maxillofacial Surgery
Journal of Pediatric Surgery
Journal of Pediatrics
Journal of Psychosomatic Research
Journal of Rheumatology 
Journal of Studies on Alcohol
Journal of the American Academy of Child and Adolescent Psychiatry
Journal of the American Academy of Dermatology
Journal of the American College of Cardiology
Journal of the American College of Surgeons
Journal of the American Dental Association
Journal of the American Dietetic Association
Journal of the American Geriatrics Society
Journal of the American Medical Association (JAMA) 
Journal of the American Pharmaceutical Association
Journal of the European Academy of Dermatology and Venereology
Journal of the National Cancer Institute
Journal of Thoracic and Cardiovascular Surgery
Journal of Trauma: Injury, Infection, and Critical Care
Journal of Urology
Journal of Vascular Surgery
Kidney International
Lancet
Laryngoscope
Leukemia and Lymphoma
Mayo Clinic Proceedings
Med Ad News
Medical Care
Medical Journal of Australia
Medicine
Medicine and Science in Sports and Exercise
Morbidity and Mortality Weekly Report 
Nephrology Dialysis Transplantation
Neuroepidemiology
Neurology
Nephrology
New England Journal of Medicine
Obstetrics and Gynecology
Ophthalmology
Ophthalmology Management
Optometric Management
Oral Oncology
Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics
Otolaryngology - Head and Neck Surgery
Outpatient Care Technology
Pace
Pain
Pediatrics
Pediatric Research
Perspectives in Gastroenterology
Perspectives on Sexual and Reproductive Health
Pharmacotherapy
Physical Therapy
Plastic and Reconstructive Surgery
PLOS Medicine
Postgraduate Medical Journal
Postgraduate Medicine
Preventing Chronic Diseases
Psychosomatic Medicine
QJM
Reproduction
Reproductive Health
Review of Optometry
Rheumatology
Scandinavian Journal of Gastroenterology
Scandinavian Journal of Rheumatology
Scandinavian Journal of Urology and Nephrology
Seminars in Arthritis and Rheumatism
Seminars in Hematology
Seminars in Liver Disease
Seminars in Oncology
Sleep
Southern Medical Journal
Spine
Stroke
Surgery
Surveillance Summaries (CDC)
Survey of Ophthalmology
Thorax
Thrombosis and Haemostasis
Thrombosis Research
Transfusion
Transplantation
Transplantation Proceedings 
Urology
Vaccine
Vision Monday
Vision Research
Weekly Epidemiological Review
WJM
World Journal of Gastroenterology
World Journal of Urology
World Psychiatry

Websites, Surveys, and Associations

Agency for Healthcare Research and Quality (AHRQ)
Alan Guttmacher Institute
American Assocation of Blood Banks (AABB)
American Cancer Society (ACS)
American Heart Association (AHA)
American Lung Association
Centers for Disease Control and Prevention (CDC)
Centers for Medicare and Medicaid Services
Central Brain Tumor Registry of the US (CBTRUS)
EUCAN database (from the International Association of Cancer Registries)
Eurostat
Eurosurveillance
GLOBOCAN (from the International Agency for Research on Cancer)
Health Forum LLC (an affiliate of the American Hospital Association)
Healthcare Cost and Utilization Project (HCUP)
Heartstats.org
Medscape Week in Review
MMWR Surveillance Summaries
National Cancer Center
National Center for Health Statistics
National Health and Nutrition Examination Survey (NHANES)
National Heart, Lung, and Blood Institute
National Institutes of Health (NIH)
National Organization for Rare Diseases (NORD)
NIH Consensus Statements
Pan American Health Organization
Plastic Surgery Information Service
Public Health Laboratory Service (PHLS)
Society for Assisted Reproductive Technology (SART)
Substance Abuse and Mental Health Services Administration (SAMHSA)
Surveillance, Epidemiology, and End Results (SEER) data
Toxic Exposure Surveillance System (TESS)
UK Renal Registry
UK Transplant
United Network for Organ Sharing (UNOS)
World Health Organization (WHO)

Patient Trends

Audit type Data source Facilities included Facilities excluded Size of audit**
Inpatient - (Diagnoses & Procedures) National Hospital Discharge Survey (NHDS)

Full documentation
Short-stay hospitals (hospitals with an average length of stay for all patients of less than 30 days) or those whose specialty is general (medical or surgical) or children's general are included in the survey. Federal, military, and Veterans Administration hospitals 2007: 422 hospitals

A total of 365,648 patient records were used to the 2007 dataset.
Emergency Room (Diagnoses) National Hospital Ambulatory Medical Care Survey (NHAMCS)

Full documentation
Hospitals with an average length of stay for all patients of less than 30 days (short-stay) or hospitals whose specialty was general (medical or surgical) or children's general were eligible. Federal hospitals, hospital units of institutions, and hospitals with less than six beds staffed for patient use. 2007: 337 Emergency Departments

A total of 35,490 patient records were used for the 2007 dataset.
Outpatient (Diagnoses) National Hospital Ambulatory Medical Care Survey (NHAMCS)

Full documentation
Hospitals with an average length of stay for all patients of less than 30 days (short-stay) or hospitals whose specialty was general (medical or surgical) or children's general were eligible. Federal hospitals, hospital units of institutions, and hospitals with less than six beds staffed for patient use. 2007: 910 clinics within 202 Outpatient Departments

A total of 34,473 patient records were used for the 2007 dataset.
Physician Office (Diagnoses) National Ambulatory Medical Care Survey (NAMCS)

Full documentation
-- Office-based, as defined by the AMA and AOA;

-- Principally engaged in patient care activities;

-- Nonfederally employed;

-- Not in specialties of anesthesiology, pathology, and radiology.
2007: 3,540 physicians: 3,301 Medical Doctors and 239 Doctors of Osteopathy. A total of 1,141 physicians did not meet all of the criteria and were ruled out of scope (ineligible) for the study.

A total of 32,778 patient records were used for the 2007 dataset.

** Numbers in this column are unweighted. However, data output in TDR's databases are weighted to estimate discharges for all U.S. facilities that correspond to the inclusion criteria.

Current Medical Diagnosis and Treatment (CMDT)

CMDT is the most comprehensive, reliable, and timely reference available to answer common questions in everyday clinical practice. Written in a concise, easy-to-read style, the text covers all aspects of outpatient and inpatient care as well as authoritative descriptions of new developments in medicine. It includes information on over 1,000 diseases and disorders with an emphasis on prevention and cost-effective treatments. CMDT also features updated information on drug dosages and updated therapeutic options in HIV, including an approach to multi-drug antiretroviral therapies. CMDT is updated annually.