- Research article
- Open Access
A study to design minimum data set of COVID-19 registry system
BMC Infectious Diseases volume 21, Article number: 773 (2021)
From the beginning of the COVID-19 pandemic, the development of infrastructures to record, collect and report COVID-19 data has become a fundamental necessity in the world. The disease registry system can help build an infrastructure to collect data systematically. The study aimed to design a minimum data set for the COVID-19 registry system.
A qualitative study to design an MDS for the COVID-19 registry system was performed in five phases at Ahvaz University of Medical Sciences in Khuzestan Province in southwestern Iran, 2020–2021. In the first phase, assessing the information requirements was performed for the COVID-19 registry system. Data elements were identified in the second phase. In the third phase, the MDS was selected, and in the four phases, the COVID-19 registry system was implemented as a pilot study to test the MDS. Finally, based on the experiences gained from the COVID-19 registry system implementation, the MDS were evaluated, and corrections were made.
MDS of the COVID-19 registry system contains eight top groups including administrative (34 data elements), disease exposure (61 data elements), medical history and physical examination (138 data elements), findings of clinical diagnostic tests (101 data elements), disease progress and outcome of treatment (55 data elements), medical diagnosis and cause of death (12 data elements), follow-up (14 data elements), and COVID-19 vaccination (19 data elements) data, respectively.
Creating a standard and comprehensive MDS can help to design any national data dictionary for COVID-19 and improve the quality of COVID-19 data.
Inequality in vaccine access, insufficient access to vaccines in most poor countries [3,4,5], and COVID-19 virus mutations are some of the biggest challenges to control the COVID-19 pandemic, especially in developing countries . Besides, there are still many questions about the long-term side effects of recovered patients and the impact of immunity from vaccination .
From the beginning of the pandemic, the rapid and surprising outbreak of COVID-19, its complex and unknown nature, has created data collection infrastructures for it, has become a fundamental necessity worldwide . The fundamental step in designing a system to record, collect and report data on a particular disease is determining the target data elements . One of the most well-known tools to determine data elements for disease registration and reporting systems is the minimum data set (MDS) . MDS is a standardized set of data elements defined in a health information system to index the minimum amount of essential data for different users in healthcare sectors . By precisely defining data elements, MDS creates a common language among all those involved in recording, collecting, analyzing, reporting, and interpreting data and ensures the collection of essential data [12, 13]. Furthermore, MDS helps improve medical records documentation, data comparability, data dictionary design, electronic data exchange among different healthcare systems and ultimately improve data quality [12, 14].
This feature has made MDS determination in disease registry systems one of the main steps to implement the system. Based on nature and application, the MDS data elements of a disease can be divided into two general categories of administrative and clinical data. The administrative data usually include demographic, socio-economic, address, phone number, patient referral data, and the main characteristic of a healthcare provider or healthcare center [15,16,17,18].
The clinical data vary depending on the type of diseases but generally include diagnosis, past medical history, laboratory findings, medical imaging findings, health interventions, disease course and progress, and outcome [16, 19]. In the case of COVID-19, the data structure is almost the same. Most case report forms, datasets, information systems, and MDSs designed for COVID-19 include patient demographic data, patient’s addresses, and telephone, Profile of healthcare center, how did infected with COVID-19, early signs and symptoms, previous health condition and underlying diseases, COVID-19 testing, CT scan findings, and disease outcome [13, 17, 20,21,22].
In Iran, at the beginning of the COVID-19 epidemic, the Ministry of Health, as the custodian of the health system, set up two information systems for reporting COVID-19 in healthcare centers. Although these two systems collect basic information about patients with COVID-19, there are problems with data quality and data adequacy to support COVID-19 research . Perhaps this is why several universities of medical sciences in Iran have launched a COVID-19 registry system [22,23,24,25,26].
According to the important role of MDS designing in the success of a disease registry system, this study was performed to design a minimum data set for the COVID-19 registry system in Khuzestan province, southwestern Iran.
A qualitative study to design MDS for the COVID-19 registry system was conducted five phases at Ahvaz University of Medical Sciences in Khuzestan Province in southwestern Iran from March 2020 to March 2021.
Phase 1: Study design and information needs assessment
The purpose of this phase was to answer the following critical questions:
What is the information that users such as researchers and policymakers of the registry program need for the future?
According to those requirements, what information of COVID-19 should be recorded?
What details are available about specific information that is recorded?
What resources can identify the information?
What are the minimum data elements?
Given the urgency of setting up the COVID-19 registry system, what methods can be used to determine MDS?
According to the above-mentioned, a project team was formed under the supervision of the Diseases and Health Outcomes Registry Systems Office in Deputy of Research and Technology of Ahvaz Jundishapur University of Medical Sciences (AJUMS).
The project team reviews the titles of the COVID-19 research proposals submitted to AJUMS as well as interviews with some researchers and experts in the field of disease registry. Moreover, the project team interview with senior managers of Deputy of Research and Technology in AJUMS. In addition, a survey was done on the structure and contents of health information systems such as SIB (an abbreviation for the Persian equivalent of “Integrated Health System”) and hospital information system (HIS), Medical Care Monitoring Center system (a system for reporting COVID-19 cases in hospitals) and the Management of Communicative Disease Prevention and Control system (a system for reporting COVID-19 cases from health centers). Also, the protocol and MDS of previous programs of disease registry at the university were studied. Furthermore, a list of the required information of the COVID-19 registry system were prepared.
In total, the following seven general areas were identified as information needed for the COVID-19 registry system in Khuzestan province:
Epidemiological study of COVID-19 prevalence and incidence.
The pattern of COVID-19 outbreaks and the factors affecting it.
The role of lifestyle in COVID-19 risk.
Symptoms, signs, and abnormal medical imaging and laboratory findings of COVID-19.
The course of the disease, drug treatment, and the patient’s response to care.
Outcomes of COVID-19 and the effect of underlying health conditions on its outcomes.
Follow up of treated patients.
Phase 2: Identification of data elements
In the second phase, the goal was to identify the data elements for each of the information needs specified in the previous phase. To identify the data elements, the project team first compiled a list of resources that could contribute to this goal. The resources included articles related to COVID-19, COVID-19 data collection tools, health information systems in Iran, medical records of patients with COVID-19, and expert opinions (such as specialist physicians, health information management specialists, and …). Table 1 describes the information resources used, the search strategy, and the data acquisition method.
The collections form was used as an instrument. The form contained five sections: the name of the data element, class, application, value, and additional descriptions. The form was designed based on a literature review on MDSs [15, 27,28,29,30,31,32,33].
After collecting data, a list of data elements was prepared using the content analysis method. Duplicate or overlap items were removed. After that, similar items were categorized into the main class, subclass, data element, and values. In general, 475 data elements were identified in 18 subclasses and eight main classes.
Phase 3: Select MDS
At this phase, the purpose was to select MDS from the data elements identified in the previous phase. The expert panel method was used to select MDS. Firstly, a list of medical specialists who are members of the university hospitals of Ahvaz and involved in the care of patients with COVID-19 was prepared. Next, the project team was selected some specialists from the list based on indicators such as interest to join the registry and have a position in the relevant specialized department. The expert panels included medical specialists and some members of the project team. Table 2 shows the demographic characteristics of participants in the expert panels. In the panels, a list of data elements that scaled with the Likert score (1–5) was distributed among participants. During the meetings, data element and their values and feasibility for collection it such as accessibility, method, and time of gathering was discussed. Finally, the primary data elements for MDS were selected.
Furthermore, some new data elements suggested by experts were considered. All data elements with more than 50% of agreement among panelists were elected to apply in the primary MDS.
Phase 4: Field-testing
Based on primary MDS, we developed web-based COVID-19 registry software (available at http://covid.ajums.ac.ir) using the Rapid Application Development (RAD) technique. In addition to registry software, paper-based forms were designed to help collect data from the hospitals. In the paper forms and registry software, data elements were divided into six top groups: administrative, disease exposure, medical history and physical examination, clinical diagnostic test findings, disease progress and outcome of treatment, and follow-up data. A WhatsApp group that had the project team and experts members was created. The designed forms were shared in the group, and the members were asked to comment on them. After reviewing the members’ comments, the approved comments were applied to the forms.
In the next step, to evaluate the following items, the registry program was tested as a pilot in Razi hospital in Ahvaz city (the capital of Khuzestan province). The evaluated items included structure and content of the designed forms, data values, mandatory fields in the registry software, and identify new data needs. Razi is a 200-bed university hospital considered the main hospital for admitting patients with COVID-19 since late February 2020, when the first positive COVID-19 case was diagnosed in Khuzestan province.
An official letter was sent to Razi Hospital and to make an announcement to invite those interested in participating in the COVID-19 registry program. The Eleven staff of the hospital were selected to participate in the registry system. After training the participants, the registry system was implemented as a pilot for 3 weeks. The participants joined a WhatsApp group to share their opinions and suggestions regarding the data elements, the data collection forms, and the registry software. In addition, two persons of participants were selected to be responsible for monitoring the data collection process and data quality control. They documented all weaknesses and problems related to the data collection process and submitted their recommendations daily. At the end of the pilot, the comments were summarized and submitted to the project manager. Based on the results of the pilot study, some changes were made to MDS, forms, and registry software. The changes included deleting and adding some data elements, renaming the subclass title or data element field name, and modifying their values.
Phase 5: Evaluate and modify MDS
At the end of May 2020, the COVID-19 registry program was implemented. Six months later, the MDS was evaluated based on the feedback obtained from the initial data analysis and the experiences gotten of the implementation process.
We modified the MDS, removed useless data elements, and added new data elements to the data collection forms and registry software. Finally, when the COVID-19 vaccination was launched in March 2021 in Ahvaz, a new top group was created for recording the vaccination data.
In the second phase of the study, 375 data elements were categorized into 14 subclasses and eight main classes based on a review of information resources. Then, in the third phase, according to the output of Expert panels, 11 data elements were eliminated, and 25 new data elements were added to the MDS.
Also, according to expert comments, some changes were made in the subclasses, and the number of subclasses increased to 27. For example, the clinical laboratory tests class was divided into five subclasses: hematology test, biochemistry tests, arterial blood gas test, hemostasis test, and other diagnostic tests finding.
After the pilot study, 12 data elements were deleted due to the impossibility of collecting in the routine process of patients with COVID-19 care. Also, 25 new data elements suggested by the participants and approved by the project team were added to the MDS. For example, the ICD10 code and the causes of death recorded in the death certificate were added.
Since to avoid users’ misconceptions and to become data elements transparent, the titles of 13 data elements were renamed.
The values of 26 data elements were also modified in the software. For example, values related to education, job title, and discharge status were changed.
Also, pilot study results showed that the data collection process should be in accordance with the patient care process. Furthermore, to facilitate data collection, the structure of data collection forms and the registry software should be as similar as possible to the medical record forms and HIS.
In the fifth phase, the database was evaluated and modified again. The modifications covered adding a new top group, two main classes, 12 subclasses, and 59 new data elements, as well as removing five subclass and 26 useless data elements. For example, due to the COVID-19 outbreak in Khuzestan province, some data element such as “disease exposure data top group”, and two subclass including “observance of safety measures” and “contact with health care facility” have lost their importance, and finally were removed.
The final MDS for the COVID-19 registry system was divided into eight top groups, 18 main classes, 70 subclasses, and 434 data elements (Table 3). The details of the final MDS are shown in Tables 4, 5, 6, 7, 8, 9, 10 and 11.
In general, the administrative data group includes two main classes, five subclasses, and 34 data elements (Table 4).
In general, the disease exposure data group includes two main classes, seven subclasses, and 61 data elements (Table 5).
In general, the medical history and physical examination data group embraces four main classes, 27 subclasses, and 138 data elements (Table 6).
In general, the clinical diagnostic test findings data group consists of three main classes, 12 subclasses, and 101 data elements (Table 7).
In general, the disease progress and outcome of treatment data group includes three main classes, 12 subclasses, and 55 data elements (Table 8).
In general, medical diagnosis and cause of death data group consists of three main classes, six subclasses, and 12 data elements (Table 9).
In general, follow-up data group embraces one main class, three subclasses, and 14 data elements (Table 10).
In general, the COVID-19 vaccination data group includes one main class, two subclasses and, and 19 data elements (Table 11).
A study on the coronavirus family showed that creating a data set can help disease control intervention . The lack of MDS is one of the technical barriers to data sharing in public health . Therefore, from the beginning of the COVID-19 outbreak, World Health Organization has recommended a “Revised case reporting form for 2019 Novel Coronavirus of confirmed and probable cases” to report COVID-19 cases and has requested national authorities to design MDS for reporting COVID-19 based on the form . However, that form may not be suitable for the COVID-19 registry system. Since the many aspects of COVID-19 were unknown at the beginning of the pandemic, there were a lot of questions about the disease in the minds of scientists and health policymakers. Therefore, the COVID-19 registry system should provide comprehensive information . This study tried to fulfill that requirement. The approach used to design MDS included identifying the required data elements, the initial design of MDS, the pilot test, and modification of MDS based on the results obtained from the implementation. Stanfill et al., in the study entitled “Health information management best practices for quality health data during COVID-19 global pandemic”, had the same approach as our study. They emphasized identifying the data elements, considered the expected results, and evaluated the output data to justify data elements .
In the MDS for the COVID-19 registry system, 396 data elements were identified in eight top groups, 17 main classes, and 67 subclasses. The first top group included administrative data that are commonly used to identify and register patients, identify a healthcare institution, reimburse the costs of healthcare services [39, 40], do medical research, and carry out a survey on the outcome and quality of healthcare [21, 41].
The second top group was disease exposure data. These data can help to determine the method of individual transmission of disease and identify early signs and symptoms. Therefore, in order to show how the patient was exposed to infection, the exposure data was used in the coronavirus family data set. For instance, COVID-19 forms and dataset , British government MDS form for MERS disease , and MDS for SARS .
Another main issue with COVID-19 is the new variants of the virus. One of the principal concerns about the coronavirus variants is whether the mutations could affect treatment and prevention or not . The importance of recording COVID-19 variants led to consider a subclass for infection with mutated strains of COVID-19 in the fifth phase of the study.
The third top group of MDS was dedicated to medical history and physical examination data. It included 22 subclasses for recording signs and symptoms of COVID-19 at the time of admission, as well as documenting the patient’s underlying medical conditions. From the beginning of the COVID-19 outbreak, much attention was paid to identifying the signs and symptoms of the disease and distinguishing it from other infectious diseases. Moreover, since the early studies in China showed that underlying medical conditions impact on COVID-19 outcome , in all forms, MDS or dataset, and health information systems related to COVID-19, the data elements of underlying medical conditions were considered. Furthermore, the information needs assessment phase indicated that most titles of COVID-19 research proposals submitted to AJUMS focused on the effect of underlying medical conditions on the outcome of COVID-19. In addition, most of the data elements in the two national COVID-19 recording and reporting systems of the Iranian Ministry of Health (Management of Communicative Disease Prevention and Control and MCMC system) are dedicated to recording the sign and symptoms and underlying diseases. Therefore, in the MDS of the COVID-19 registry system, a classified approach was used to define the symptoms and underlying diseases to record them more accurately.
The fourth top group of MDS was related to clinical diagnostic test findings. The purpose of the three main classes in this group was to record abnormal medical imaging, laboratory, and cardiology diagnostic tests in patients with COVID-19, especially those hospitalized. One of the most important of the data was medical imaging data. The findings of CT scan and chest x-ray play an essential role in the diagnosis, the clinical course of the disease, and the choice of treatment for patients with COVID-19 [45,46,47].
The importance of imaging data has encouraged the Iranian Ministry of Health, in collaboration with the Iranian Society of Radiology to propose a standard form for reporting medical imaging data in patients with COVID-19 . In the same manner, the Radiological Society of North America (RSNA) also has provided a standard classification for reporting CT scan findings on COVID-19 . The study indicated that laboratory diagnostic data and cardiology diagnostic tests were other essential data that medical specialists emphasized on registering them. The reason for this attention may be the importance of the data elements in the treatment of inpatients with COVID-19 [50,51,52,53,54].
Disease progress and outcome of treatment data were the next top group of MDS. The data shows a period of the disease and the outcome of care. If the data combine with other data such as age, sex, underlying medical conditions and comorbidity, and clinical diagnostic test findings, they can facilitate many statistical analysis and artificial intelligence data modeling that can be applied in reliable prediction about the outcome of the disease based on extracting hidden relationships among the clinical and non-clinical data [55,56,57].
Therefore, 52 data elements were considered to record clinical course (such as hospitalization), disease complications, treatment measures, and disease outcome. The disease complications and outcomes were considered essential data in other forms, MDSs, and data sets related to COVID-19. For example, Shanbehzadeh and Kazemi-Arpanahi, in their study entitled “Development of minimal basic data set to report COVID-19”, proposed two subclasses for data elements of disease complications and outcomes .
Another questionable issue related to the COVID-19 is the effectiveness of various medications on the treatment outcome. Although the forms and databases for recording and reporting COVID-19 do not usually mention the medications used to treat the patient, we have considered a separate class for medications because the topic is important for medical research.
The data elements related to medications may help to identify the effects of different medications in the treatment of COVID-19.
The top group for medical diagnosis and cause of death data was considered to record the relationship between primary and final diagnosis and the cause of death in patients with COVID-19.
The group included diagnostic (based on WHO’s ICD-10 classification system), causes of death, and medical procedures codes (based on ICD9CM Volume 3).
Clinical coding of medical records can help to manage statistical data about diseases and causes of death at the national or international levels . Therefore, that data could facilitate retrieving information about patients with COVID-19 in the future. Most studies conducted to design MDS of diseases have suggested using diagnostic data elements [16, 27, 29].
Coinciding with the COVID-19 Pandemic, the WHO proposed new ICD codes for the disease to help classify and report it. WHO also published a guideline for recording and coding the causes of death due to COVID-19 . In addition to WHO efforts, some countries have established a process to record COVID-19 coding data. For example, in the Irish COVID-19 data set, “diagnosis concepts” is considered for recording diagnostic data . Also, in the United States, several guidelines were published by the CDC, AHIMA, and AMA regarding the recording and coding of diagnoses and medical procedures for COVID-19 [13, 61, 62]. As the same manner, Iran’s Ministry of Health has already issued three guidelines for coding COVID-19 .
The top group was follow-up data. In the group, data related to patient monitoring up to 2 weeks after discharge from the hospital or quarantine at home was recorded.
The patient follow-up is important for two reasons: firstly, to ensure that the signs and symptoms of the disease improve, and secondly, to track people who are in close contact with the patient. Therefore, the patient follow-up is essential protocols in controlling COVID-19 especially for a patient who is in quarantine at home.
Another fundamental way to effectively control the disease is vaccination. COVID-19 vaccination started in March 2021 in Ahvaz. Therefore, at the beginning of vaccination, we considered a top group of MDS to record its data. Recording vaccination information is valuable in several ways. Firstly, the data can be used to evaluate the effectiveness of different vaccines. Secondly, they help to evaluate the vaccination effectiveness on disease control. Finally, the data can aid in assessing the side effects of vaccines.
The MDS designed in the present study has tried as much as possible to cover the essential data for the COVID-19 registry system. Using a comprehensive MDS and a systematic approach to data collection of COVID-19 can provide valuable information for health policymakers, researchers, and clinical specialists.
Given the importance of having accurate, complete, and up-to-date information on COVID-19 disease control, it strongly recommends that different countries should design a comprehensive national MDS for COVID-19. The methodology used in this study can also help other developing countries that do not have a comprehensive infrastructure for disease recording and reporting systems to implement similar disease registry systems.
Limitation of study
At the beginning of the project, there were few related studies to our topic. Also, due to the difficulty in long-term follow-up of patients, data elements have not been considered for long-term COVID-19 complications.
We recommend that future studies can focus on the effectiveness of the COVID-19 registry system in data quality. Also, we strongly recommend that an international MDS be designed for the long-term complications of COVID-19.
Availability of data and materials
The datasets used during the current study are available from the first author on reasonable request.
American Health Information Management Association
Ahvaz Jundishapur University of Medical Sciences
Acute kidney injury
American Medical Association
Acute respiratory distress syndrome
Body mass index
Blood urea nitrogen
Coronary artery disease
Center for Disease Control
Congestive heart failure
Chronic kidney disease
Chronic obstructive pulmonary disease
Cerebra vascular accident
Disseminated intravascular coagulation
Glasgow coma scale/score
Hospital information system
International Committee on Taxonomy of Viruses
Interstitial lung disease
International normalized ratio
Lactic acid dehydrogenase
Length of stay
Mean corpuscular hemoglobin concentration
Medical Care Monitoring Center System
Mean corpuscular volume
Minimum data set
N-terminal pro brain natriuretic peptide
Partial thromboplastin time
Rapid Application Development
Red cell distribution width
White blood cell
World Health Organization
WHO Coronavirus (COVID-19) dashboard. https://covid19.who.int/.
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Authors are express gratitude and appreciation for cooperating of Dr. Ali Mohammad Hadianfard for editing the manuscript.
Deputy of Research in Ahvaz Jundishapur University of Medical Sciences has found this project for implementation during pandemic disease of COVID-19 in the world. But this fund is no effect on the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.
Ethics approval and consent to participate
Ethical issues such as plagiarism, data fabrication, data falsification, conflict of interest, misconduct, double publication and/or submission, redundancy, etc. have been completely observed by the authors. Ethics committee of Ahvaz Jondishapur University of Medical Sciences, Ahvaz, Iran approved the study with Ethical approval code: IR.AJUMS.REC.1399.061. Written informed consent was obtained from all participants in this study.
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Zarei, J., Badavi, M., Karandish, M. et al. A study to design minimum data set of COVID-19 registry system. BMC Infect Dis 21, 773 (2021). https://doi.org/10.1186/s12879-021-06507-8
- Minimum data set
- Registry system