Showing 1 – 26 of 26 results.
Curated
Bayesian Modeling Framework for Causal Inference and Assessing Sensitivity to Unmeasured Confounding with Multiple Treatments [Methods Study], United States, 2020-2022 (ICPSR 39721)
Released/updated on: 2026-03-23
Geographic coverage: United States
Time period: 2020-01-01--2022-01-01
The research team based their new method on an existing method called Bayesian Additive Regression Trees, or BART. To test the new method, the team used data created by a computer program to look like real patient data. Then they compared the new method with current methods under different scenarios. Each scenario included three treatments. The team changed the total number of patients, the number of patients who took each treatment, and how alike or different the patients were who took each treatment. Across all scenarios, the team predicted the average treatment effect for all patients and for only patients who received a treatment.
Next, the research team used the new method with real data from patients with lung cancer who were receiving care in New York City hospitals. The team compared three types of surgery: open chest, robotic assisted, and video assisted. The team looked at the effects of each type of surgery on four health outcomes: breathing problems; length of hospital stay after surgery; stay in an intensive care unit, or ICU; and the need to return to the hospital.
Patients, doctors, and researchers helped design the study.
Curated
Comparison of Outcomes of Antibiotic Drugs and Appendectomy (CODA), United States, 2016-2020 (ICPSR 38541)
Released/updated on: 2022-11-14
Geographic coverage: United States
Time period: 2016-05-03--2021-06-21
Antibiotics are considered a feasible treatment for appendicitis, yet appendectomy remains the treatment standard in the United States. Previous randomized trials comparing these treatments excluded important subgroups and recruited small sample sizes but questions remain about the applicability of these previous findings. This study conducted the Comparison of Outcomes of antibiotic Drugs and Appendectomy (CODA) randomized clinical trial to compare antibiotics with appendectomy among adults with appendicitis, including those with appendicolith. Those recruited comprised a diverse population, compared an overall measure of health status as the primary outcome, and included several secondary clinical and patient-reported outcomes, complications, and measures of healthcare utilization.
Curated
Computer-Administered Animation as a New Method for Measuring Young Children's Health Outcomes [Methods Study], Orange County, California, 2013-2018 (ICPSR 39517)
Released/updated on: 2025-10-09
Geographic coverage: Orange County, United States, California
Time period: 2013-01-01--2018-01-01
Patients often take surveys about their health or quality of life. Results from these surveys can help doctors meet patients' needs. Young children can't fill out surveys by themselves. They may not be able to read or understand the questions. Most often, parents or hospital staff read the questions aloud, or parents answer the questions for their children. But this method may not give accurate results.
In this study, the research team tested three surveys for children ages 4 to 12 who are going to have or who recently had surgery. The first survey asks about general health. The second survey asks about feeling worried before surgery. The third survey asks about pain after surgery. A computer program reads the survey questions aloud. The surveys are animated and choices for the answers appear as cartoons.
The team wanted to learn if the surveys were
- Accurate, or correctly capturing how the children were feeling
- Reliable, or if children answered in a consistent way when asked similar questions
Curated
National Health Interview Survey, 1977: Hearing Supplement (ICPSR 9228)
Released/updated on: 2010-12-14
Geographic coverage: United States
Time period: 1976-01-01--1977-01-01
The basic purpose of the Health Interview Survey (HIS) is to obtain information about the amount and distribution of illness, its effects in terms of disability and chronic impairments, and the kinds of health services people receive. The 1977 Hearing Supplement provides variables from the core Person File (see HEALTH INTERVIEW SURVEY, 1977 [ICPSR 7839]) including sex, age, race, marital status, veteran status, education, income, industry and occupation codes, and limits on activity. The variables unique to this supplement include information on hearing problems, use of aids, hearing acuity, chronic and acute conditions, restriction of activities, medical treatment, surgery, hospitalization, and medicine.
Curated
National Health Interview Survey, 1990: Hearing Supplement (ICPSR 9910)
Released/updated on: 1993-04-09
Geographic coverage: United States
The basic purpose of the National Health Interview Survey (NHIS) is to obtain information about the amount and distribution of illness, its effects in terms of disability and chronic impairments, and the kinds of health services people receive. The purpose of this supplement was to obtain current data on one of the most prevalent chronic conditions in the United States: hearing impairment, including deafness. The file contains approximately 90 variables from the core file (see NATIONAL HEALTH INTERVIEW SURVEY, 1990 [ICPSR 9839]), including sex, age, race, marital status, veteran status, education, income, industry and occupation codes, and limits on activity. Variables unique to this supplement include range of age at onset of hearing problems, ringing noises heard, Gallaudet hearing scale scores, use of hearing aids, medical treatment, surgery, hospitalization, and medicine.
Curated
National Health Interview Survey, 1991: Hearing Supplement (ICPSR 6433)
Released/updated on: 1995-03-16
Geographic coverage: United States
The basic purpose of the National Health Interview Survey (NHIS) is to obtain information about the amount and distribution of illness, its effects in terms of disability and chronic impairments, and the kinds of health services people receive. The purpose of this supplement was to obtain current data on one of the most prevalent chronic conditions in the United States: hearing impairment, including deafness. The file contains variables from the core file (see NATIONAL HEALTH INTERVIEW SURVEY, 1991 [ICPSR 6049]), including sex, age, race, marital status, veteran status, education, income, industry and occupation codes, and limits on activity. Variables unique to this supplement include range of age at the start of hearing problems, ringing noises heard, Gallaudet hearing scale scores, use of hearing aids, medical treatment, surgery, hospitalization, and medication used for hearing problems.
Curated
National Hospital Ambulatory Medical Care Survey, 1992 (ICPSR 6585)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 1991-12-02--1992-12-27
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey (NAMCS) collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The 1992 NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. Between December 2, 1991, and December 27, 1992, data were collected from 314 OPDs and 437 EDs. Among the variables included are age, race, and sex of the patient, along with the reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1993 (ICPSR 6915)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 1992-12-28--1993-12-26
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey (NAMCS) collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The 1993 NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1993 survey, data were collected from 228 OPDs and 395 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1994 (ICPSR 6824)
Released/updated on: 2006-01-12
Geographic coverage: United States
Time period: 1993-12-27--1994-12-25
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey (NAMCS) collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The 1994 NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1994 survey, data were collected from 260 OPDs and 418 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1995 (ICPSR 2422)
Released/updated on: 2006-01-18
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey (NAMCS) collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1995 survey, data were collected from 230 OPDs and 391 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1996 (ICPSR 2365)
Released/updated on: 2006-01-18
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey (NAMCS) collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1996 survey, data were collected from 235 OPDs and 392 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1997 (ICPSR 2740)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 1996-12-23--1997-12-21
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1997 survey, data were collected from 236 OPDs and 395 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1998 (ICPSR 2916)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 1997-12-22--1998-12-20
The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1998 survey, data were collected from 239 OPDs and 398 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 1999 (ICPSR 3156)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 1998-12-21--1999-12-19
The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1999 survey, data were collected from 241 OPDs and 376 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 2000 (ICPSR 3551)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 1999-12-27--2000-12-24
The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2000 survey, data were collected from 221 OPDs and 376 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 2001 (ICPSR 3813)
Released/updated on: 2006-01-18
Geographic coverage: United States
Time period: 2001-01-01--2001-12-27
The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2001 survey, data were collected from 224 OPDs and 364 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Curated
National Hospital Ambulatory Medical Care Survey, 2002 (ICPSR 4405)
Released/updated on: 2006-02-17
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2002 survey, data were collected from 224 OPDs and 376 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (EDs only), surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2002, a number of updates and revisions have been made to the drug characteristics data. The variables CSTRATM and CPSUM have been added to assist in the computation of variances.
Curated
National Hospital Ambulatory Medical Care Survey, 2003 (ICPSR 4406)
Released/updated on: 2011-10-12
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2003 survey, data were collected from 236 OPDs and 475 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (EDs only), surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2003, additional updates and revisions have been made to the drug characteristics data. The variables CSTRATM and CPSUM have been added to assist in the computation of variances.
Curated
National Hospital Ambulatory Medical Care Survey, 2004 (ICPSR 4530)
Released/updated on: 2006-09-06
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2004 survey, data were collected from 204 OPDs and 458 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury, surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2004, additional updates and revisions have been made to the drug characteristics data. The variables CSTRATM and CPSUM have been added to assist in the computation of variances.
Curated
National Hospital Ambulatory Medical Care Survey, 2005 (ICPSR 28261)
Released/updated on: 2010-06-08
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2005 survey, data were collected from 205 OPDs and 417 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury, surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2005, additional updates and revisions have been made to both the emergency department and outpatient department data, including modifications to preexisting variables and the inclusion of new variables pertaining but not limited to patient pregnancy, height, and weight.
Curated
National Hospital Ambulatory Medical Care Survey, 2006 (ICPSR 28321)
Released/updated on: 2010-06-11
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2006 survey, data were collected from 236 OPDs and 464 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury, surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2006, additional updates and revisions have been made to both the emergency department and outpatient department data, including modifications to pre-existing variables and the inclusion of new variables pertaining but not limited to electronic medical record systems and diagnostic screening services.
Curated
National Hospital Ambulatory Medical Care Survey, 2007 (ICPSR 28442)
Released/updated on: 2010-06-24
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2007 survey, data were collected from 202 OPDs and 432 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury, surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2007, additional updates and revisions have been made to both the emergency department and outpatient department data, including modifications to pre-existing variables pertaining but not limited to electronic medical records.
Curated
National Hospital Ambulatory Medical Care Survey, 2008 (ICPSR 29922)
Released/updated on: 2011-01-18
Geographic coverage: United States
The National Hospital Ambulatory Medical Care Surveys (NHAMCS) provide data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2008 survey, data were colected from 209 OPDs and 431 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit physician's diagnoses, cause of injury, surgical procedures (OPD's only), medication therapy, and expected source of payment. The 2008 survey remains unchanged from the previous year.
Self-published
National Neighborhood Data Archive (NaNDA): Healthcare Services by Census Tract and ZCTA, United States, 1990-2022 (ICPSR 209050)
Released/updated on: 2026-03-31
Time period: 1990-01-01--2022-01-01
This dataset contains measures of the number and density of health care services per United States Census Tract or ZIP Code Tabulation Area (ZCTA) from 1990 through 2022. The dataset includes four separate files for four different geographic areas (GIS shapefiles from the United States Census Bureau).
Curated
National Survey of Ambulatory Surgery: 1994, 1995, 1996, and 2006 (ICPSR 27461)
Released/updated on: 2011-01-18
Geographic coverage: United States
The National Survey of Ambulatory Surgery (NSAS) was first conducted during the years 1994, 1995, and 1996 in response to the dramatic increase in the number of ambulatory surgery centers during the 1980's and early 1990's. The purpose of the first three years of the NSAS was to collect data on ambulatory (outpatient) surgery procedures performed in hospitals and free-standing ambulatory surgery centers in the United States. General demographic data pertaining to age, sex, and race were collected. Additionally, the 1994-1996 NSAS collected data on hospital diagnoses, outpatient procedures, the type of anesthesia used during the aforementioned outpatient procedures, and the payment methods for the procedures. Following a ten year hiatus, the NSAS was once again conducted in 2006. This iteration of the survey expands on the previous years' data collections. Like the 1994-1996 NSAS, the 2006 NSAS collected general demographic information on age and sex along with data on hospital diagnoses, outpatient procedures, and the type of anesthesia used during outpatient procedures. The 2006 NSAS collected additional data on patient symptoms, types of insurance, various time measures related to the medical procedures, and multiple measures pertaining to the status and health of the patients.
Curated
National Survey of Surgeons on Trauma Care Issues, March-July 1993 (ICPSR 6265)
Released/updated on: 1998-04-28
Geographic coverage: United States
Time period: 1993-03-02--1993-07-01
This study investigated surgeons' practice patterns, experience and training in trauma care, and preferences and opinions about caring for trauma patients. Practice pattern variables include surgical specialty, type of surgical practice arrangement, type of appointment with a medical school or university, membership in the American Academy of Orthopedic Surgeons, the American College of Surgeons, or the American Association of Neurological Surgeons, and whether the respondents' patients paid their bills through private insurance, Medicaid, Medicare, or an HMO. In addition, respondents were queried about their primary hospital, including number of beds, types of physicians employed in the trauma or emergency department, whether the hospital was officially recognized as a trauma center, whether it had a separate clinical trauma service with oversight and responsibility for the care of trauma patients, whether surgical patients were covered 24 hours a day by a resident or in-house physician, and whether there was 24-hour coverage by a resident or in-house physician in the hospital's Intensive Care Unit. To assess experience and training in trauma care, respondents were asked how often they were inappropriately called to evaluate and treat trauma patients, if they had taken trauma call at any hospital during the last 12 months, how many trauma patients they treated during the last 12 months and for what percent of them they received compensation, whether they had taken the Advanced Trauma Life Support (ATLS) Course in the last four years, how much they had learned about trauma from residency training, post-residency fellowship, combat duty in the Armed Forces, journal articles, and colleagues, how confident they were in their ability to provide resuscitation, diagnosis, operative care, and critical care, if they had ever been named in a malpractice suit in a trauma case, non-trauma emergency case, or non-emergency case in certain disease categories, and whether this litigation made them reluctant to take on these types of cases. Preferences and opinions on the care of trauma patients were investigated through questions that asked respondents if they preferred to treat adult or pediatric trauma patients, if they preferred to treat blunt or penetrating trauma, and how taking care of trauma patients affected their image with their peers and community. Respondents were also queried about incentives and disincentives for treating trauma patients, reasons for not providing trauma care, opinions on how trauma cases compared with other emergency cases, and opinions on how various aspects of trauma care in their community were deficient. The data also include information on the age, gender, and geographic location (census region) of the respondents.