Ambulatory Health Care Data

Ambulatory Care Monthly News

February 2021

STATS OF THE MONTH

In recognition of American Heart Month (February), we present estimates for visits to emergency departments (ED) for coronary artery disease, ischemic heart disease, or history of myocardial infarction (MI) from the 2018 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2018, patients with coronary artery disease, ischemic heart disease, or history of MI documented in the medical record accounted for 9.2% of all visits to the ED made by adults. Visits by patients with coronary artery disease, ischemic heart disease, or history of MI increased by age, representing 2.4% of ED visits made by adults aged 18-54, 16.7% of ED visits made by adults aged 55-74 and 28% of ED visits made by adults aged 75 and over. (Estimates from the Public Use File)
  • In 2018, chest pain and related symptoms was the primary reason for visit in 6.7% of all visits to the ED made by adults aged 18 and over. Visits with chest pain and related symptoms as the primary reason for visit were higher among adults aged 55-74 (8.3%) than among adults aged 18-54 (6.2%) and adults aged 75 and over (5.5%). (Estimates from the Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

When performing trend analysis and/or combining multiple years of data, it is important to check that the variables of interest were collected the same way for all of the years contained in your analysis. For example, the number of drugs that are collected has increased over time: from 5 in 1994 to 6 in 1995 to 8 in 2003 to 10 in 2012 and to 30 in 2014. If an increase is observed in the number of medications prescribed, this could be due to the increase in the number of drugs collected in the survey and not an actual increase in prescribing patterns. Therefore, a trend examining prescribing from 2000-2018 should only include the first six listed drugs in all years. You can review the survey instruments for NAMCS and NHAMCS here.

NEW PRODUCTS THIS MONTH

  • QuickStats: Emergency Department Visit Rates for Motor Vehicle Crashes, by Age Group — United States, 2018. MMWR Morb Mortal Wkly Rep 2021;70:106. This quickstats shows that in 2018 there were 10.5 emergency department visits per 1,000 persons for motor vehicle crashes. Rates were highest among persons aged 15-24 years (18.6) and declined with age to 11.7 for those aged 25–64 years and to 4.2 for those aged ≥65 years.

 

January 2021

YEAR IN REVIEW

  • In 2020, the Ambulatory and Hospital Care Statistics Branch released several publications using data from the National Ambulatory Medical Care Survey (NAMCS) and from the National Hospital Ambulatory Medical Care Survey (NHAMCS). The publications consisted of NCHS data briefs, NCHS reports, QuickStats, web tables and manuscripts that can be found here or by selecting the publication name below. In 2020, the 2018 NHAMCS Emergency Department public use data file and documentation were also made available for downloading, along with SAS, Stata, and SPSS files for reading and formatting the data. Restricted data files may be accessed through the Research Data Center.

Publications from NAMCS in 2020

NCHS reports and data briefs

Manuscripts

  • Santo L, Ward BW, Rui P, Ashman JJ.  Antineoplastic drugs prescription during visits by adult cancer patients with comorbidities: findings from the 2010-2016 National Ambulatory Medical Care Surveyexternal icon. Cancer Causes Control. 2020 Feb 21. doi: 10.1007/s10552-020-01281-5.  This manuscript uses 2010-2016 National Ambulatory Medical Care Survey to describe the frequency of comorbidities at visits by patients with breast, prostate, colorectal, and lung cancer and the frequency of a prescription for antineoplastic drugs being included in the treatment received at visits by patients with cancer and concomitant comorbidities. The authors show that among US visits by adult patients with breast, prostate, colorectal, or lung cancer, 56.3% were by patients with ≥ 1 comorbidity. Hypertension was the most frequently observed comorbidity (37.7%), followed by hyperlipidemia (19.0%) and diabetes (12.3%). Antineoplastic drugs were prescribed in 33.5% of the visits.
  • Santo L, Schappert SM, Hootman JM, Helmick CG. Arthritis Care Res (Hoboken). 2020 Sep 16. doi: 10.1002/acr.24447. Online ahead of print. PMID: 32937030. Trends in office visits during which opioids were prescribed for adults with arthritis: United States, 2006-2015external icon.  This manuscript investigates national trends in opioid prescriptions during visits to office‐based physicians made by adults with arthritis in the US from 2006 to 2015. The analysis shows that office visits for arthritis increased from 2006 to 2015 and the proportion of those visits with opioids prescribed increased as well.
  • Ward BW, Myrick KL, Cherry DK. Physician specialty and office visits made by adults with diagnosed multiple chronic conditions: United States, 2014-2015external icon. Public Health Reports. 2020. Epub ahead of print. doi: 10.1177/0033354920913005. This manuscript uses 2014-2015 National Ambulatory Medical Care Survey to describe visits to office‐based physicians made by adults with multiple chronic conditions in the US.  The analysis shows that 40.0% of physician office visits were made by adults with multiple chronic conditions. Among visits by adults with multiple chronic conditions a higher percentage of visits were to specialists in cardiovascular disease (74.7%) and internal medicine (57.6%).

Publications from NHAMCS in 2020

NCHS reports, data briefs and quickstats

Web tables

NEW PRODUCTS THIS MONTH

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS. 

 

December 2020

STATS OF THE MONTH

In recognition of National Influenza Vaccination Week (December 6-12), we present estimates for visits to emergency departments (ED) at which an influenza test was provided, from the 2018 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2018, an influenza test was provided at 5.7% of all ED visits. Children younger than 18 were tested for influenza more frequently than adults. Children were tested at 11.3% of ED visits made by children whereas adults aged 18-65 and 65 and over were tested for influenza at 3.8% and 4.9% of ED visits made by adults. (Estimates from the Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

With the release of the 2005 National Ambulatory Medical Care Survey (NAMCS) and National Hospital Ambulatory Medical Care Survey (NHAMCS) public use micro-data files, provider weights became available. The variable PHYSWT on the NAMCS file allows researchers to make physician-level estimates. EDWT on the NHAMCS file allows researchers to make estimates at the emergency department level. SAS code examples to produce aggregate visits statistics at the physician or facility level are available here pdf icon[PDF – 52.6 KB].

NEW PRODUCTS THIS MONTH

  • QuickStats: Emergency Department Visit Rates Related to Mental Health Disorders, by Age Group and Sex — National Hospital Ambulatory Medical Care Survey, United States,§ 2016–2018. MMWR Morb Mortal Wkly Rep 2020;69:48. This quickstats shows that during 2016–2018 there were 43.9 emergency department visits per 1,000 persons per year with a diagnosis of a mental health disorder. Rates were lowest among children aged <18 years (12.8) and highest for adults aged 18–44 years (64.9). Rates declined with age for adults aged 18–44 to ≥65 years (32.2).
  • QuickStats: Percentage of Emergency Department (ED) Visits Made by Adults with Influenza and Pneumonia That Resulted in Hospital Admission, by Age Group — United States 2017–2018. MMWR Morb Mortal Wkly Rep 2020;69:49. This quickstats shows that 37.2% of ED visits for influenza and pneumonia by adults aged ≥18 years resulted in a hospital admission during 2017–2018. The percentage increased with age from 14.4% for adults aged 18–54 years to 46.9% for adults aged 55–74 years and 69.7% for adults aged ≥75 years.

 

November 2020

STATS OF THE MONTH

In recognition of the American Diabetes Month (November 1-30) we present estimates for diabetes visits to emergency departments (ED) from the 2018 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2018, approximately 16.6 million visits were made by patients with diabetes mellitus* documented in their medical record, accounting for 12.8% of all ED visits. Visits made by patients with diabetes mellitus vary by age, with a higher percentage of visits being made by patients age 65 and older (28.9%) than by patients aged 45-64 (22.5%) and aged 44 and younger (4.0%) (Estimates from the Public use files)

* Include Diabetes mellitus type 1, type 2 and unspecified

DATA TIP OF THE MONTH

Did you know . . .

NAMCS and NHAMCS collect information on up to 30 drugs provided, prescribed or continued at ambulatory medical care visits. Drug entries are coded in two ways: as reported in the survey instrument using an internal NCHS classification, and also by their generic components and therapeutic classifications using Lexicon Plus®, a proprietary database of Cerner Multum, Inc. NCHS provides an online look-up tool which allows you to search for drugs in recent years of NAMCS and NHAMCS data.

NEW PRODUCTS THIS MONTH

  • The 2018 NHAMCS Emergency Department public use data file and documentation are now available for downloading, along with SAS, Stata, and SPSS files for reading and formatting the data.  In addition to the SAS, Stata, and SPSS code which can be used with the ASCII data file to create data sets, we also provide pre-made SAS, Stata, and SPSS datasets.
  • Davis D., Rui P. Urban-rural Differences in Visits to Office-based Physicians by Adults With Hypertension: United States, 2014–2016 pdf icon[PDF – 276 KB]. National Health Statistics Reports no 147. Hyattsville, MD: National Center for Health Statistics. 2020. This report examines urban-rural differences in visits made by adults with documented hypertension by age, sex, and race and ethnicity during 2014–2016. The report shows that in large metro areas visits by adults with hypertension were lower than in small-medium metro and rural areas. Visits by males with hypertension were higher than visits by females, overall and in urban and rural areas. Visits by adults with hypertension increased by age, overall and in all residence areas. More visits were made by non-Hispanic black adults with hypertension than non-Hispanic white adults and Hispanic adults.

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS.

 

October 2020

STATS OF THE MONTH

In recognition of National Dental Hygiene Month (October 1-31) we present estimates for visits to emergency departments (ED) for symptoms relating to teeth and gums from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, there were approximately 1.3 million ED visits for symptoms relating to teeth and gums, representing 0.9% of all ED visits. Among ED visits by persons aged 15-64, symptoms relating to teeth and gums was the principal reason for 1.3% of visits. Furthermore, among ED visits by males aged 15-64, this reason accounted for 2.0% of visits and was among the top 10 reasons for visiting the ED. (Estimates from Table 10 pdf icon[PDF – 863 KB] and the Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

For users who are interested in analyzing drug data, one method involves the isolation of those records with drugs, or drug mentions, and the creation of a separate data file of drug mentions. Each Patient Record for 2017 can have up to thirty drug mentions recorded, so whatever file is created would need to include all of them. This method can be used for obtaining estimates of drug mentions, but is not recommended for variance estimation. Etimates of drug mentions can be obtained by creating a new weight variable (called DRUGWT in this example). This variable is created by multiplying PATWT (the patient visit weight) by NUMMED (the number of medications recorded at the sampled visit) or DRUGWT=PATWT*NUMMED. DRUGWT can then be used in place of PATWT to weight one’s data; it produces the estimated number of drug mentions rather than visits.

NEW PRODUCTS THIS MONTH

Trends in office visits during which opioids were prescribed for adults with arthritis: United States, 2006-2015external icon. Santo L, Schappert SM, Hootman JM, Helmick CG. Arthritis Care Res (Hoboken). 2020 Sep 16. doi: 10.1002/acr.24447. Online ahead of print. PMID: 32937030. This manuscript investigates national trends in opioid prescriptions during visits to office‐based physicians made by adults with arthritis in the US from 2006 to 2015. The analysis shows that office visits for arthritis increased from 2006 to 2015 and the proportion of those visits with opioids prescribed increased as well.

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS.

 

September 2020

STATS OF THE MONTH

In recognition of National Recovery Month (September 1-30) we present estimates for visits to emergency departments (ED) made by patients with substance abuse or dependence documented in their medical record from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, there were approximately 8 million visits to the ED made by patients with substance abuse or dependence documented in their medical record, accounting for 5.8% of the visits made to the ED. A higher percentage of visits by patients aged 26-45 had substance abuse or dependence documented in their medical record (9.7% of all visits by patients aged 26-45) than visits by patients aged 25 and younger (2.9%) and visits by patients aged 46 and older (5.7%). (Estimates from Table 13 pdf icon[PDF – 863 KB] and the Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

When conducting a trend analysis, data users should note that, beginning with the 2002 public use files, two masked design variables were added to the file, for use with statistical software that assumes a single stage of sampling. For the 2003 public use files and beyond, only these two masked design variables are included for variance estimation. Therefore, when combining years of data from 2003 and beyond with years prior to 2002, data users will need to create these two variables for each file prior to 2002. A technical paper with instructions can be found here pdf icon[PDF – 33.9 KB].

NEW PRODUCTS THIS MONTH

No new products this month.

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS.

 

August 2020

STATS OF THE MONTH

In recognition of Children’s Eye Health and Safety Month (August 1-31) we present estimates for visits to emergency departments (ED) for injury of the eye from the 2016-2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2016 and 2017, there were approximately 11.1 million injury visits to the ED made annually by children and adolescents aged 18 and younger. Among these visits, 1.2% were made for injury of the eye or orbit (Estimates from the Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

A Diagnosis Master Category List (DMCL) which includes diagnosis categories appropriate for use across both inpatient and ambulatory settings is available here pdf icon[PDF – 443]. The DMCL uses all ICD–10–CM codes and classifies them into 339 mutually exclusive categories. The DMCL will slightly change each year to account for annual changes to the ICD–10–CM coding system. This list was based on the 2016 ICD–10–CM coding system.

NEW PRODUCTS THIS MONTH

No new products this month.

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS.

 

July 2020

STATS OF THE MONTH

In recognition of World Hepatitis Day (July 28) we present estimates for Hepatitis B and C from the 2016 National Ambulatory Medical Care Survey (NAMCS).

  • In 2016, there were approximately 1.6 million visits to office-based physicians made by patients with a diagnosis of Hepatitis B and 3.5 million visits made by patients with a diagnosis of Hepatitis C documented in their medical record. Visits made by patients with Hepatitis B accounted for 0.2% of all office-based physician visits and visits made by patients with Hepatitis C accounted for 0.4% of all office-based physician visits. The percentage of visits made by patients with Hepatitis C was higher among patients aged 45-64 (0.8%) and 65-74 (0.6%) than patients aged 45 and under (0.2%). (Estimates from Table 18 pdf icon[PDF – 906 KB])

DATA TIP OF THE MONTH

Did you know . . .

The CSTRATM and CPSUM variables were created and first added to the NAMCS and NHAMCS 2002 public use files for running programs that use an ultimate cluster model. They can be used to estimate variance with SUDAAN’s with-replacement (WR) option, as well as with Stata, SPSS, SAS, and other statistical software packages utilizing an ultimate cluster model for variance estimation. These variables and their use are described in detail in the “Relative Standard Errors” section of the public use file documentation. The decision was made to include only these new variables, CSTRATM and CPSUM, and not the multi-stage design variables, beginning with the 2003 data release. For those who wish to combine data from 2003 forward with survey data from years prior to 2002 which do not contain CSTRATM and CPSUM, please see the technical paper: Using Ultimate Cluster Models with NAMCS and NHAMCS Public Use Files pdf icon[PDF – 33.9 KB].

NEW PRODUCTS THIS MONTH

No new products this month.

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS.

 

June 2020

STATS OF THE MONTH

In recognition of Alzheimer’s and Brain Awareness Month (June 1-30), we present estimates for visits to emergency departments (ED) made by patients with Alzheimer’s disease or dementia documented in their medical records, from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, approximately 1.8 million ED visits were made by patients with Alzheimer’s disease or dementia documented in their medical record, accounting for 1.7% of all ED visits made by adults. More visits were made by women with Alzheimer’s disease or dementia documented in the medical record (1.1%) than men (0.6%).  (Estimates from the Public Use File).

DATA TIP OF THE MONTH

Did you know . . .

NHAMCS public use files are provided in ASCII text format that allow the data to be used by many software products. NCHS provides sample SAS statements, SPSS and Stata code for use with NHAMCS data files from 1992 forward. The survey undergoes periodic redesign, which can make the process of combining multiple years of data challenging. NCHS staff make every effort to point out important changes in the annual public use file documentation. Staff members are also available to answer technical questions 301-458-4600.

NEW PRODUCTS THIS MONTH

  • Ashman JJ, Schappert SM, Santo L. Emergency department visits among adults aged 60 and over: United States, 2014–2017. NCHS Data Brief, no 367. Hyattsville, MD: National Center for Health Statistics. 2020. This data brief shows that in 2014–2017, the emergency department (ED) visit rate for persons aged 60 and over was 43 visits per 100 persons aged 60 and over and increased with age. About 7% of ED visits among patients aged 60 and over were made by nursing home residents, 30% of patients arrived by ambulance and unintentional falls accounted for 13% of ED visits made by patients aged 60 and over. Nearly one-quarter of ED visits among patients aged 60 and over resulted in a hospital admission, and this percentage increased with age.

 

May 2020

STATS OF THE MONTH
In recognition of National Women’s Health Week (May 10-16), we present estimates for visits to emergency departments (ED) made by women from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, approximately 61 million visits were made to the ED by women aged 18 and over, accounting for 58.1% of all adult visits to the ED. Abdominal pain, cramps and spasms was the most common reason for visit among women 18 and over (8.7%), followed by chest pain (5.4%), headache (3.5%), shortness of breath (3.3%), and cough (2.8%). (Estimates from the Public Use File).

DATA TIP OF THE MONTH

Did you know . . .

Missing values are imputed every year for some items. Starting with 2010 data, the imputation of patient race and ethnicity was performed using a model-based single, sequential regression method. The model used to impute race and ethnicity in 2017 NHAMCS included the following variables: Census variables for ZIP code level race and ethnicity population estimates and an indicator for whether it was patient or hospital ZIP (used when patient ZIP was not available); patient age, sex, race, and ethnicity; triage level; log of ED wait time; primary expected source of payment derived from a hierarchical recode of the expected source of payment question; grouped 3-digit ICD-10-CM codes for primary diagnosis; year of visit; type of ESA area; provider’s MSA status; and ED weighting and volume variables. The list of items with a nonresponse rate greater than 5% and the list of the imputed items can be found here starting on page 13 pdf icon[PDF – 14 KB].

NEW PRODUCTS THIS MONTH

 

April 2020

STATS OF THE MONTH
In recognition of Alcohol Awareness Month (April 1-30), we present estimates for visits to emergency departments (ED) made by patients with alcohol misuse, abuse, or dependence, documented in the medical record from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, patients with alcohol misuse, abuse, or dependence, documented in the medical record accounted for 3.1% of all visits to the ED. Visits made by patients with alcohol misuse, abuse, or dependence in the medical record varied by sex, with a higher percentage of visits being made by males (4.7%) than females (1.8%). (Estimates from Table 13 pdf icon[PDF – 864 KB] and Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

For NHAMCS 2017, anomalies between 2017 and 2016 data were assessed. To accomplish this, more than 20 tables of 2017 estimates were compared with the same tables of 2016 estimates. The variables that were compared included most of those published in the annual survey web tables available here. Significant changes between the two years were noted and investigated. More information about the changes can be found in the 2017 NHAMCS Public use file documentation.

 

March 2020

STATS OF THE MONTH
In recognition of National Kidney Month (March 1-31), we present estimates for visits to emergency department (ED) for chronic kidney disease (CKD) from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, patients with CKD documented in the medical record accounted for 2.9% of all visits to the ED and for 3.7% of all visits to the ED visits made by adults aged 18 and over. Visits made by adults patients with CKD in the medical record increased by age, more visits were made by adult aged 65 and over (10%) than adult aged 45-64 (4.4%) and adults aged 18-44 (0.6%). (Estimates from Table 13 pdf icon[PDF- 863 KB] and Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

A new template for producing Methods sections of journal articles using NHAMCS data covering data years 1992-2016 is available here pdf icon[PDF – 28 KB]. The document also provides a useful checklist for NHAMCS article submission.

NEW PRODUCTS THIS MONTH

  • Santo L, Ward BW, Rui P, Ashman JJ. Antineoplastic drugs prescription during visits by adult cancer patients with comorbidities: findings from the 2010-2016 National Ambulatory Medical Care Surveyexternal icon. Cancer Causes Control. 2020 Feb 21. doi: 10.1007/s10552-020-01281-5. This manuscript uses 2010-2016 National Ambulatory Medical Care Survey to describe the frequency of comorbidities at visits by patients with breast, prostate, colorectal, and lung cancer and the frequency of a prescription for antineoplastic drugs being included in the treatment received at visits by patients with cancer and concomitant comorbidities. The authors show that among US visits by adult patients with breast, prostate, colorectal, or lung cancer, 56.3% were by patients with ≥ 1 comorbidity. Hypertension was the most frequently observed comorbidity (37.7%), followed by hyperlipidemia (19.0%) and diabetes (12.3%). Antineoplastic drugs were prescribed in 33.5% of the visits.

 

February 2020

STATS OF THE MONTH

In recognition of American Heart Month (February 1-29), we present estimates for visits to emergency department (ED) for coronary artery disease, ischemic heart disease, or history of myocardial infarction (MI) from the 2017 National Hospital Ambulatory Medical Care Survey (NHAMCS).

  • In 2017, patients with coronary artery disease, ischemic heart disease, or history of MI documented in the medical record accounted for 6.1% of all  visits to the ED and for 22.3% of the ED visits made by adults aged 65 and over.  More visits were made by male aged 65 and over (28.1%) than female aged 65 and over (18.2%) with coronary artery disease, ischemic heart disease, or history of MI documented in the medical record.  (Estimates from Table 13 pdf icon and Public Use File)
  • In 2017, chest pain and related symptoms was the primary reason for visit in 5.7% of all visits to the emergency department (ED) made by adults aged 18 and over. Visits with chest pain and related symptoms as primary reason for visit were higher among patients aged 55 and over (6.9%) than among patients aged 18-54 (5.1%). (Estimates from the Public Use File)

DATA TIP OF THE MONTH

Did you know . . .

To  calculate department-level estimates an emergency department weight (EDWT) can be used. When running an analysis of facility-level characteristics using EDWT, it is recommended to select only those records where EDWT is greater than 0. This will result in correct sample counts of variables, which is useful for assessing reliability. Estimates at the ED level generated using EDWT reflect only the characteristics of facilities which participated in the survey.

NEW PRODUCTS THIS MONTH

  • 2017 NHAMCS EMERGENCY DEPARTMENT SUMMARY WEB TABLES pdf icon – The Ambulatory and Hospital Care Statistics Branch is pleased to release the most current nationally representative data on ambulatory care visits to hospital emergency departments (ED) in the United States. Estimates are presented on selected hospital, patient, and visit characteristics using data collected in the 2017 NHAMCS.
  • QuickStats: Percentage of Emergency Department Visits for Pain at Which Opioids Were Given or Prescribed, by Geographic Region of the Hospital — United States, 2005–2017. MMWR Morb Mortal Wkly Rep 2020;69:53. This quickstas shows that the percentage of ED visits for pain at which an opioid was given or prescribed increased from 37.4% in 2005 to 43.1% in 2010 and then decreased to 30.9% in 2017. A similar pattern was observed in all four regions. In 2017, the percentage was 21.1% in the Northeast, compared with 32.0% in the Midwest, 32.0% in the South, and 34.7% in the West.
  • QuickStats: Percentage of Emergency Department Visits for Acute Viral Upper Respiratory Tract Infection at Which an Antimicrobial Was Given or Prescribed, by Age — United States, 2010–2017. MMWR Morb Mortal Wkly Rep 2020;69:174. This quickstats shows that the percentage of ED visits for acute viral upper respiratory tract infection that had an antimicrobial given or prescribed, decreased from 23.4% in 2010-2013 to 17.6% in 2014-2017. A decline was seen for ED visits by children, decreasing from 17.9% to 10.1%, but not for ED visits by adults.

 

January 2020

 YEAR IN REVIEW

Publications from NAMCS in 2019

NCHS reports and data briefs

Web tables

  • 2013 NAMCS Community Health Center (CHC) Web Tables pdf icon[PDF – 669 KB]. Rui P, Kang K, Yacisin K, Okeyode T. National Ambulatory Medical Care Survey – Community Health Centers: 2013 State and National Summary Tables. Nationally representative data on ambulatory care visits to community health centers in the United States are presented on selected provider, patient, and visit characteristics using data collected in the 2014 NAMCS Community Health Center component.
  • 2016 NAMCS SUMMARY WEB TABLES pdf icon[PDF – 906 KB] – The most current nationally representative data on ambulatory care visits to physician offices in the United States are presented on selected physician, patient, and visit characteristics using data collected in the 2016 NAMCS.
  • 2014 NAMCS Community Health Center Summary Tables pdf icon[PDF – 584 KB]: The most current nationally representative data on ambulatory care visits to community health centers in the United States are presented on selected provider, patient, and visit characteristics using data collected in the 2014 NAMCS Community Health Center component.

Manuscripts

  • Akinbami LJ, Salo PM, Cloutier MM, Wilkerson JC, Elward KS, Mazurek JM, Williams S, Zeldin DC. Primary care clinician adherence with asthma guidelines: the National Asthma Survey of Physicians. J Asthma. 2019 Mar 1:1-13external icon. This article examines adherence to asthma guidelines by using the 2012 National Asthma Survey of Physicians (NAS): a one-time provider questionnaire supplement to National Ambulatory Medical Care Survey (NAMCS). The authors found that pediatricians were more likely to report high adherence than other clinicians and adherence was higher for history-taking recommendations and lower for recommendations involving patient education, equipment and expertise.
  • Santo L, Rui P, Hales CM, Arem H, Ogden CL. Am J Prev Med. 2019 Nov;57(5):716-717. Trends in Preventive Visits Among U.S. Youth Where Weight and Height Were Recorded: 2005-2016external icon. This research letter provides trends in preventive visits from 2005 through 2016 in which weight and height were recoded among children and adolescents. The authors found that overall, the percentage of preventive visits in which weight and height were recorded increased from 87.6% in 2005 to 95.6% in 2016. Similar trends were found among children and adolescents.

Publications from NHAMCS in 2019

NCHS reports, data briefs and quickstats

Web tables

  • 2016 NHAMCS EMERGENCY DEPARTMENT SUMMARY WEB TABLES pdf icon[PDF- 978 KB] – The Ambulatory and Hospital Care Statistics Branch is pleased to release the most current nationally representative data on ambulatory care visits to hospital emergency departments (ED) in the United States. Estimates are presented on selected hospital, patient, and visit characteristics using data collected in the 2016 NHAMCS.

NEW PRODUCTS THIS MONTH

  • Trends in opioids prescribed at discharge from emergency departments among adults: United States, 2006–2017 pdf icon[PDF – 436 KB]. Rui P, Santo L, Ashman JJ. National Health Statistics Reports; no 135. Hyattsville, MD: National Center for Health Statistics. 2020. This report describes trends in ED visits made by adult patients at which opioids were prescribed at discharge from 2006-2007 to 2016-2017. The authors found that the percentage of ED visits by adults with opioids prescribed at discharge increased from 2006–2007 (19.0%) through 2010–2011 (21.5%) and then decreased from 2010–2011 through 2016–2017 (14.6%). The top five diagnoses associated with an opioid prescribed at discharge were dental pain, urolithiasis, fracture injuries, back pain, and extremity pain.
  • Physician office visits at which benzodiazepines were prescribed: Findings from 2014–2016 National Ambulatory Medical Care Survey pdf icon[PDF – 376]. Santo L, Rui P, Ashman JJ. National Health Statistics Reports; no 137. Hyattsville, MD: National Center for Health Statistics. 2020. This report describes visits to office-based physicians made by adult patients at which benzodiazepines were prescribed, including visits were opioids were coprescribed. The authors found that during 2014–2016, the rate of visits at which benzodiazepines were prescribed was 27 annual visits per 100 adults and one-third of these visits involved an overlapping opioid prescription. Mental disorders were the most frequent primary diagnosis category for visits at which benzodiazepines were prescribed, whereas diseases of the musculoskeletal system and connective tissue was the most frequent primary diagnosis category for visits at which benzodiazepines were coprescribed with opioids.

DATA TELL STORIES

Tell Us Yours! How have you used information from the National Ambulatory Medical Care Survey or the National Hospital Ambulatory Medical Care Survey? Email us a brief description at ambcare@cdc.gov. In the subject field of your email, write “My NAMCS/NHAMCS data use example”. Your examples will help us showcase the value of NAMCS and NHAMCS.

 

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Page last reviewed: April 8, 2021