| Prospective Evaluation of Airways Reactivity (NCT00005282) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-12-01 |
| The Seattle Social Development Project: An Implementation of the Raising Healthy Children Intervention (NCT04075019) | University of Washington | 1981-09-01 |
| Physicians' Health Study (NCT00000500) | Brigham and Women's Hospital | 1981-09-01 |
| Evaluation of SC-V Versus Conventional CPR (NCT00000502) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-09-01 |
| Hypertension Prevention Trial (HPT) Feasibility Study (NCT00000501) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-09-01 |
| A Controlled Prospective Study of Transfusion-Associated Hepatitis (NCT00004848) | National Institutes of Health Clinical Center (CC) | 1981-07-01 |
| National Health and Nutrition Examination Survey IV (NHANES (IV) (NCT00005154) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-07-01 |
| Coronary Drug Project Mortality Surveillance (NCT00000483) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-06-01 |
| Effects of Salt Intake on the Nervous Systems of Patients With Salt-Sensitive High Blood Pressure (NCT00001176) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-05-01 |
| Prospective Evaluation of Radial Keratotomy (PERK) Study (NCT00000129) | National Eye Institute (NEI) | 1981-04-01 |
| Cancer Control Following Polypectomy (NCT00591279) | Memorial Sloan Kettering Cancer Center | 1981-02-01 |
| Brain Study of Patients With Frontal Lobe Dementia and Parkinsonian Disorders (NCT00001178) | National Institute of Neurological Disorders and Stroke (NINDS) | 1981-01-19 |
| Monroe County Inflammatory Bowel Disease (IBD) Registry (NCT01032525) | University of Rochester | 1981-01-01 |
| Studies of Organ Transplantation in Animals and Man (NCT00156364) | Michael Mauer, MD | 1981-01-01 |