- Research article
- Open Access
Using a hepatitis B surveillance system evaluation in Fujian, Hainan, and Gansu provinces to improve data quality and assess program effectiveness, China, 2015
BMC Infectious Diseases volume 20, Article number: 547 (2020)
Monitoring hepatitis B surveillance data is important for evaluating progress towards global hepatitis B elimination goals. Accurate classification of acute and chronic hepatitis infections is essential for assessing program effectiveness.
We evaluated hepatitis B case-reporting at six hospitals in Fujian, Hainan and Gansu provinces in 2015 to assess the accuracy of case classification. We linked National Notifiable Disease Reporting System (NNDRS) HBV case-reports with hospital information systems and extracted information on age, gender, admission ward and viral hepatitis diagnosis from medical records. To assess accuracy, we compared NNDRS reported case-classifications with the national HBV case definitions. Multivariable logistic regression was used to identify factors associated with misclassification.
Of the 1420 HBV cases reported to NNDRS, 23 (6.5%) of the 352 acute reports and 648 (60.7%) of the 1068 chronic reports were correctly classified. Of the remaining, 318 (22.4%) were misclassified and 431 (30.4%) could not be classified due to the lack of supporting information. Based on the multivariable analysis, HBV cases reported from Hainan (aOR = 1.8; 95% CI: 1.3–2.4) and Gansu (aOR = 12.7; 95% CI: 7.7–20.1) along with reports from grade 2 hospitals (aOR = 1.6; 95% CI:1.2–2.2) and those from non-HBV related departments (aOR = 5.3; 95% CI: 4.1–7.0) were independently associated with being ‘misclassified’ in NNDRS.
We identified discrepancies in the accuracy of HBV case-reporting in the project hospitals. Onsite training on the use of anti-HBc IgM testing as well as on HBV case definitions and reporting procedures are needed to accurately assess program effectiveness and ensure case-patients are referred to appropriate treatment and care. Routine surveillance evaluations such as this can be useful for improving data quality and monitoring program effectiveness.
Globally, 257 million persons have chronic hepatitis B virus infections (HBV) and nearly 900,000 HBV-related deaths occur annually . To address this disease burden, the World Health Organization (WHO) outlined a new strategy for viral hepatitis elimination, focusing on a 90% reduction of new chronic viral hepatitis B cases by 2030 . China has reduced HBV transmission in persons born after 1992 through the successful implementation of a HBV vaccination program [3, 4]. By 2010, more than 98% of children were completing the three-dose hepatitis B vaccination series each year . However, an estimated 90 million individuals of whom the majority are older than 30 years of age , are HBV surface antigen positive (HBsAg+) and at risk of developing cirrhosis and liver cancer [7, 8]. Persons who are HBsAg+ can transmit HBV to susceptible persons.
Approximately 10% of the population in China was identified as HBsAg+ in a 1992 sero-survey . To monitor changes in the prevalence of HBsAg+, the National Health Commission (NHC) (formerly the National Health and Family Planning Commission) implemented a policy requiring hospital staff to report all newly identified HBsAg+ case-patients to the National Notifiable Disease Reporting System (NNDRS). NNDRS is a passive web-based surveillance system that relies on clinicians to report HBV infections as either acute, chronic or non-classifiable HBV infections, based on the case definitions outlined in the national HBV reporting guidelines . The system is available in all hospitals in China and can be used to monitor the accuracy and occurrence of acute and chronic HBV case reports. Passive surveillance is generally less costly to implement and maintain than active surveillance. Relying on clinicians for case reporting, however, can negatively affect the accuracy of the surveillance data, particularly if interpretations of the case definitions and diagnostic criteria are highly variable [11,12,13]. Previous evaluations of acute HBV case-reporting to NNDRS in Yunnan, Shanghai, Tianjin, and Qinghai, for example, indicated that only 4–37% of acute cases were reported correctly, according to the national case definitions [14,15,16,17,18]. These findings can affect the validity of HBV incidence estimates, the timely identification of HBV outbreaks, and the ability to appropriately target HBV prevention and control interventions.
In this project, we evaluated the accuracy of HBV surveillance data reported to NNDRS from hospitals in three geographically and demographically diverse provinces and identified factors that may affect the accuracy of these reports. We anticipate that the findings from this project can be used to strengthen China’s HBV surveillance program to monitor the occurrence of acute and chronic infections and to assist it in achieving its global hepatitis B elimination goals . When combined with more resource intensive sero-surveys [19, 20], the methods described in this paper could also be adapted and implemented in other high HBV burden countries as a supplemental tool for monitoring hepatitis B program effectiveness.
Project site selection
We evaluated HBV case-reporting in Fujian, Hainan, and Gansu Provinces (Fig. 1). Fujian is located on the eastern coast and has a population of 37 million; Gansu is located in the west and has a population of 26 million; and Hainan, is the smallest province and an island, with a population of approximately 9 million in 2010 . The estimated population prevalence of HBsAg+ is 4.4% in Gansu, 11.9% in Hainan, and 15.5% in Fujian .
In China, NHC rates hospitals from grade 1 to 3 based on the level of service availability. Grade 3 hospitals offer the highest comprehensive level of service. In each province, we selected one grade 2 and one grade 3 hospitals for a total of six project hospitals using the following criteria: 1) the hospital had an advanced laboratory information system (LIS) with access to HBsAg test results; 2) the hospital had an electronic hospital information system (HIS) that can link the LIS to the inpatient medical record number; and 3) in 2015, the hospital reported a greater number of hepatitis B cases compared to the hospital-based provincial mean. Additionally, administrators at each hospital agreed to participate in the project. Because more than 90% of hepatitis B cases are reported from grade 2 and 3 hospitals, we elected not to include other types of health care facilities in this project.
Case inclusion criteria and data collection
We included hepatitis B cases from the six participating hospitals that were reported to NNDRS from 1 January to 31 December 2015 and had a LIS record indicating HBsAg+ test result for the same time-period. We downloaded all HBV cases that were reported to NNDRS from the six hospitals and linked these case reports to LIS data by name, gender, and birthdate. NNDRS records that could not be linked to LIS data and outpatients without record numbers were excluded from the analysis. We developed a standard abstraction form to collect medical record data from the six project hospitals for the reported HBV cases that were successfully linked to LIS. Staff from the Chinese Center for Disease Control and Prevention (China CDC) and the six hospitals used the form to collect the following information: reason for admission, admission ward (HBV-related wards included internal medicine, infectious disease, gastroenterology, and liver disease; non-HBV-related wards included surgery, pediatrics, obstetrics and gynecology, pulmonology, endocrinology, nephrology, orthopedics, neurosurgery, and traditional Chinese medicine), discharge diagnoses, clinical information including signs and symptoms of viral hepatitis, liver function tests, HBV DNA viral load, and hepatitis B sero-markers including HBV core antibody IgM (anti-HBc IgM), IgM antibody for hepatitis A virus (anti-HAV IgM) and hepatitis E virus (anti-HEV IgM), and hepatitis C virus antibody (anti-HCV). We obtained information on a patient’s classification as an acute or chronic hepatitis B case from the hospital’s information system.
Data management and analysis
We double-entered and verified data abstracted from the medical record in EpiData (version 3.1, Denmark). The resulting EpiData database was merged with the NNDRS-LIS case data using the patient medical record number and imported into SPSS (version 23, IBM, New York, USA) for analysis. We generated descriptive statistics on HBV cases by province, hospital grade, ward type, and patient characteristics. We compared the classification of hepatitis cases reported to NNDRS with the national HBV case definitions.
According to the national case definitions, hepatitis B patients should be classified as follows:
HBV carriers: HBsAg-positive patient with no signs or symptoms of liver disease and normal alanine aminotransferase (ALT) levels (≤40 IU/mL).
Acute HBV: HBsAg-positive patient, who has signs or symptoms of liver disease or abnormal ALT levels (> 40 IU/mL) without chronic inflammatory changes reported on abdominal ultrasound and negative hepatitis A and hepatitis E serologies, and who has clear evidence of HBV infection for less than 6 months or anti-HBc IgM positive.
Chronic HBV: HBsAg-positive patient, who has signs or symptoms of chronic liver disease or abnormal ALT levels (> 40 IU/mL), and with at least one of the following: previous history of HBV infection ≥6 months before, chronic inflammatory changes reported on abdominal ultrasound, or anti-HBc IgM negative.
Cirrhosis: HBsAg-positive patient with liver cirrhosis as reported via abdominal ultrasound, computerized tomography (CT), or magnetic resonance imaging (MRI).
Hepatocellular carcinoma (HCC): patient with liver lesion(s) that are suggestive of HCC reported via abdominal ultrasound, CT, or MRI together with alpha fetoprotein (AFP) > 400 μg/mL.
Non-classifiable HBV: HBsAg-positive patient with only signs and symptoms of liver disease and no additional information, or an HBsAg-positive patient with insufficient information for classification.
We generated descriptive statistics on the clinical characteristics and laboratory test results from HBV patients who were included in the final database. Patients who were reported to NNDRS as having acute HBV infection were considered to be correctly classified if they met the case definition for acute HBV based on the medical record review. Similarly, patients reported to NNDRS as having chronic HBV were considered to be correctly classified if they met the case definition of chronic HBV, cirrhosis, or HCC, based on the medical record review. The remaining patients were considered misclassified, or unable to be classified because of missing laboratory data. We calculated the percentage of patients who were correctly and incorrectly classified by province, hospital grade, gender, age, ward type, and primary discharge diagnosis (HBV or other). We stratified this analysis by NNDRS reporting status (i.e., reported as an acute or chronic HBV patient). In this bivariate analysis, all hospital and patient characteristics, except for province (three categories) and age (four categories), were dichotomized. An alpha level of 0.05 was applied to assess statistical significance.
Using classification status—NDRSS case-reports that were correctly classified and case-reports that were misclassified (including unable to classify)—as our binary dependent variable, we developed a logistic regression model to estimate the crude association of each of the above characteristics (e.g., province, hospital grade, and ward type) with an incorrect HBV case classification. Characteristics that were statistically significant in the crude analysis were included in our multivariable logistic regression model. Unadjusted and adjusted odds ratios (OR) and 95% confidence intervals (CI) were calculated. Finally, using available medical record information, we described the characteristics of HBV case-reports that were misclassified as acute and chronic in NNDRS.
The China CDC Ethics Review Committee approved the project as a program evaluation. The United States Centers for Disease Control and Prevention approved the project as a routine surveillance activity. We maintained all project-related data on a secure and password-protected computer.
From 1 January–31 December 2015, 2064 HBV patients were reported to NNDRS by the six participating hospitals. Of these, 644 (31.2%) were excluded from the analysis: 236 did not have HBsAg+ test results in LIS and 408 were outpatients (Fig. 2). Among the remaining 1420 patients, 881 (62.0%) were from Fujian Province, 267 (18.8%) were from Hainan, and 272 (19.2%) were from Gansu. Most patients (n = 1014, 71.4%) were reported from grade 3 hospitals, were male (n = 991, 69.8%), and were ≥ 40 years of age (n = 873, 61.5%).
The percentage of cases reported to NNDRS as chronic HBV was 12.5% (34/272) in Gansu Province, 61.8% (165/267) in Hainan, and 98.6% (869/881) in Fujian. The percentage of cases reported to NNDRS as acute HBV was 87.5% (238/272) in Gansu Province, 38.2% (102/267) in Hainan, and 1.4% (12/881) in Fujian. Across all project hospitals, the majority (57.7%) of HBV cases were reported from HBV-related wards (Table 1). A larger percentage of patients from HBV-related departments were assessed for signs and symptoms of HBV infection and underwent an abdominal ultrasound or testing for HBV DNA, hepatitis A, C, and E compared to patients from non-HBV-related wards (data not shown, all p-values < 0.05). Regardless of the ward, only 1.4% of all patients underwent anti-HBc IgM testing. Of the 352 reported acute HBV patients, only 34.4, 0.3, and 2.8% of patients received testing for anti-HAV IgM, anti-HEV IgM, and anti-HBc IgM, respectively. Less than half of all HBV patients had medical record documentation of a hepatitis B diagnosis.
Of the 352 patients reported to NNDRS as having acute HBV infections, 23 (6.5%) were correctly classified as having acute HBV. The remaining 329 included 45 (12.8%) patients who should have been reported as HBV carriers, 100 (28.4%) as chronic HBV cases, 17 (4.8%) as cirrhotic cases, 11 (3.1%) with HCC, and 156 (44.3%) who were non-classifiable (i.e., missing diagnostic information) (Fig. 3). Of the 1068 patients who were reported to NNDRS as having a chronic infection, 648 (60.7%) were correctly classified in NNDRS at the time of the initial report. The remaining 420 included 143 (13.4%) patients who should have been reported as HBV carriers, two (0.2%) as having an acute HBV infection, and 275 (25.7%) who were considered to be non-classifiable. In our bivariate analysis of acute HBV case-reports to NNDRS, province, hospital grade, ward type (HBV or non-HBV related), and having a discharge diagnosis of HBV were statistically associated with an incorrect HBV case-classification (all p-values < 0.05; Table 2). Of the chronic HBV case-reports to NNDRS, gender, age, ward type, and having a discharge diagnosis of HBV were statistically associated with an incorrect case-classification (all p-values < 0.05). Overall, 25 (1.8%) of the reported HBV patients could be considered to have acute infections based on the available information. Of these, 19 (76%) were from Hainan Province, and the remaining five (20%) were less than 24 years of age and eligible to have received the HBV vaccination as children.
When we combined all correctly classified and misclassified case-reports in our crude analysis, province, hospital grade, ward type, female, and older patients were statistically associated with having an incorrect case-classification (all p-values < 0.05; Table 3). In the multivariable analysis, misclassified case-reports were more likely to be from Gansu (aOR = 12.7, 95% CI:7.7–20.1) and Hainan (aOR = 1.8, 95% CI:1.3–2.4), admitted to a grade 2 hospital (aOR = 1.6, 95% CI:1.2–2.2), and from a non-HBV-related wards (aOR = 5.3, 95% CI:4.1–7.0). Neither age nor gender were statistically significant in the multivariable model.
The major reason identified for incorrectly reporting patients as having an acute (n = 120, 36.5%) or chronic (n = 207, 49.3%) infection was lack of additional history or diagnostic testing accompanying abnormal ALT results. The lack of testing following identification of abnormal signs and symptoms as well as ALT test results were also related to incorrect acute (n = 36, 10.9%) and chronic reporting (n = 68, 16.2%). Additionally, 41 (12.5%) of the misclassified acute HBV infections and 15 (3.6%) of misclassified chronic HBV infections had discharge diagnoses that differed from the corresponding NNDRS case classification (Table 4).
Our evaluation identified discrepancies in the classification of HBV cases reported to NNDRS—only 60% of chronic HBV cases and 7% of acute HBV cases were reported correctly to NNDRS. Most misclassifications involved patients with chronic HBV or HBV carriers or patients without the required diagnostic information who were reported as having an acute infection. Misclassification varied by province, hospital grade, and ward type. Additionally, only a few patients received anti-HBc IgM laboratory tests for differentiating acute and chronic infections as recommended. These discrepancies can be addressed through training, possible revisions to reporting procedures, and development of feedback mechanisms to hospital staff. Our project highlights the importance of routine surveillance evaluations for assessing data quality and monitoring program effectiveness.
Correct case classification in our study was substantially lower than observed in previous evaluations in other locations in China, including in Chongqing, Shandong, Hunan, and Zhejiang Provinces [23,24,25,26]. These evaluations suggested that between 63 and 84% of all diagnosed HBV patients were correctly reported to NNDRS. This difference could reflect inconsistency in hepatitis B reporting practices across provinces  as well as variability in the methodologies applied in these surveillance evaluations. The WHO has recently prioritized standardized indicator-based surveillance and monitoring tools in the global viral hepatitis elimination strategy that could be used to ensure comparability of the results . Despite these differences, the correct HBV case classification was consistency lower in grade 2 hospitals for all evaluations conducted in China. Because health care staff at grade 3 hospitals in China typically have advanced degrees in medicine and research, these findings could suggest differences in training and clinical awareness. Lack of awareness among health care workers and laboratory staff was also identified as a major gap in viral hepatitis case detection and reporting in a survey on HBV and HCV testing and service delivery in low and middle-income countries . Staffing constraints and doctor-to-patient ratios could also affect the correct case classification and reporting [29, 30]. Targeting lower-level hospital staff with specific interventions, including site visits and regular reviews, may increase the reporting accuracy.
The accuracy of HBV case-reporting also varied by hospital ward. In Fujian, for example, nearly 70% of HBV cases were reported by a ward that was responsible for liver diseases. These patients were primarily seen for liver-related symptoms, resulting in more extensive use of diagnostic testing and facilitating correct case reporting. Most hepatitis B patients (88%) reported by non-liver disease wards—including surgery, pediatric, and gynecologic and obstetrics wards—at the two hospitals in Gansu Province may explain the number of patients who were misclassified in NNDRS. Hospitalized patients in China are routinely tested for HBV infection, and in order to help prevent mother-to-child transmission (PMTCT), the NHC implemented a national policy requiring antenatal HBsAg testing for pregnant women in 2010 . These strategies have increased HBV testing in non-liver disease wards. Strengthening the training on HBV case definitions for clinicians, especially for non-liver disease wards, could greatly improve the accuracy of HBV diagnosis.
Regardless of the ward, laboratory testing necessary for differential diagnosis was limited for the HBV patients reported by the six participating hospitals. Only one-third of the reported acute HBV patients received testing for hepatitis A infections, and only 40 and 1.2% of patients seen in the liver disease wards were tested for anti-HEV IgM and anti-HBc IgM respectively. Frequency of testing for anti-HEV IgM and anti-Hbc IgM was even lower in non-liver disease wards. Because anti-HBc IgM titers can be used to differentiate acute and chronic infections, WHO recommends anti-HBc IgM testing to assist with diagnosing recent infections, particularly if the patient’s medical history or previous testing results are unknown. In our project, HBV patients were commonly misclassified as acute because of a lack of previous medical history and laboratory testing. Most of these patients would have likely been correctly classified as having chronic HBV by anti-HBc IgM testing if it had been performed as recommended . Insufficient testing due to lack of clinical awareness or cost of testing was identified as a gap in generating quality epidemiologic data on hepatitis B infections in high burden countries .
Our findings may also reflect the current NNDRS reporting procedures. Testing hospitalized patients in China for HBsAg is routine practice , and all clinicians are required to report hepatitis B cases to NNDRS within 24 h of the initial diagnosis. Although clinicians can revise NNDRS case reports after additional diagnostic information becomes available, there is currently no incentive to do so. These classification discrepancies could be minimized by training hospital staff to reclassify NNDRS case reports when the final discharge diagnosis has been recorded in the hospital information system. Additionally, mechanisms should be created to ensure that regular reviews (i.e., monthly) are conducted to assess classification of NNDRS HBV case-reports. Routine feedback from China CDC on findings from the national hepatitis B surveillance program could also help local clinicians improve patient diagnosis and reporting practices .
Surveillance data are used to generate regional, national, and global estimates of acute and chronic HBV infections. The misclassification errors identified in our evaluation, as well as in previous studies, suggest that the incidence and prevalence of acute HBV and chronic HBV calculated from NNDRS are likely inaccurate. If we apply our re-classification results to the national HBV case-data from 2015, for example, the number of acute infections may be overestimated by as much as 37,000 and the number of chronic infections could be underestimated by more than 300,000. These inaccuracies result in major challenges in identifying HBV outbreaks, evaluating the effectiveness of current prevention measures, and in efficiently allocating health care resources . The 17 correctly classified acute infections from the two hospitals in Hainan, for example, could suggest missed opportunities to vaccinate and should be further investigated.
Our evaluation had several limitations. First, we conducted the evaluation in six hospitals in three provinces, limiting the generalizability of the results. Because of differences in the service area and population size of the project hospitals, our results do not reflect the incidence or prevalence of hepatitis B in the local population. Second, we targeted grade 2 and 3 hospitals; surveillance quality in lower level healthcare facilities was not evaluated. Based on our findings, additional training and support for HBV case-reporting at these lower level facilities would likely also be beneficial. Third, almost 30% of HBV case-reports to NNDRS could not be classified because of missing clinical information or testing results in LIS. We were also unable to evaluate reporting classification of outpatients who did not receive a hospital record number. The accuracy of the case classification of these HBV case-reports currently remains unknown. New approaches are needed to ensure that all HBV patients are identified and correctly reported to NNDRS. Finally, we were not able to assess the extent of under-reporting, meaning those patients who were diagnosed with acute or chronic HBV infections but who were not reported to NNDRS.
Our surveillance evaluation at six hospitals in three provinces identified discrepancies in the classification of HBV case-reports to NNDRS. Onsite training on the use of anti-HBc IgM testing as well as on HBV case definitions and reporting procedures are needed to accurately assess program effectiveness and ensure that patients are referred for the appropriate treatment and care. Routine feedback mechanisms from the national hepatitis B surveillance program would also be beneficial. Because surveillance data are used to monitor program effectiveness and progress toward global viral hepatitis elimination goals, our findings support the use of similar evaluations in other locations as a possible complement to resource-intensive HBV sero-surveys.
Availability of data and materials
The datasets generated and/or analyzed during the current study are not publicly available due to reasons of patient confidentiality but are available from the corresponding author on reasonable request.
Hepatitis B virus
World Health Organization
HBV surface antigen positive
- NHC :
National Health Commission
National Notifiable Disease Reporting System
Laboratory information system
Hospital information system
- China CDC:
Chinese Center for Disease Control and Prevention
- anti-HBc IgM:
HBV core antibody IgM
- anti-HAV IgM:
Antibody IgM for hepatitis A virus
Antibody for hepatitis C virus
Magnetic Resonance Imaging
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We thank Fujian, Gansu and Hainan provincial and prefecture staff who contributed to the field work and Dr. Huai Yang for her contributions in developing the initial project protocol.
This project was funded by China-U.S. Collaborative Program on Emerging and Re-emerging Infectious Diseases (5U2GGH000961–04), and the Chinese Ministry of Science and Technology Program for Important Infectious Diseases Control and Prevention (2017ZX10105015).
Ethics approval and consent to participate
The China CDC Ethical Review Committee approved the project as a program evaluation. The United States Centers for Disease Control and Prevention approved the project as a routine surveillance activity. We maintained all project related data on a secure and password protected computer.
Consent for publication
We do not have any known conflicts of interest associated with this publication. There is no significant financial support for this work that could have influenced its outcome.
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Zheng, H., Millman, A.J., Rainey, J.J. et al. Using a hepatitis B surveillance system evaluation in Fujian, Hainan, and Gansu provinces to improve data quality and assess program effectiveness, China, 2015. BMC Infect Dis 20, 547 (2020). https://doi.org/10.1186/s12879-020-05265-3
- Hepatitis B; acute hepatitis infection
- Chronic hepatitis infection