Cost-utility analysis of newborn hepatitis B immunization in Beijing

ABSTRACT

Objectives

To evaluate cost-utility of universal Hepatitis B vaccination program in the Beijing city (Beijing).

Methods

A decision-Markov model was constructed to determine the cost-utility of the universal immunization program for infants (universal vaccination program) by comparing with a hypothetic nonvaccination strategy in Beijing. Parameters in models were extracted from Beijing Center for Disease Control and Prevention (CDC) annual work report, Beijing health statistical yearbook, National Health Survey report, Beijing 1% population sample survey report, Beijing Health and Medical Price Monitoring Data Platform, and public literatures. The incremental cost‑utility ratio (ICUR) was used to compare alternative scenarios. One-way sensitivity analysis and probabilistic sensitivity analysis were used to assess parameter uncertainties.

Results

The universal vaccination program had increased the utility and reduced cost among infants born in 2016 in Beijing. The ICUR was CNY −24,576.61 (US$ −3779.16) per QALY for universal vaccination program comparing with non-vaccination scenario from healthcare perspective. It was estimated that the universal vaccination would save direct medical treatment cost of CNY 2,262,869,173.50 (US$ 347,962,414.43) and prevent loss of 18322.25 QALYs within lifetime of target cohort. Discount rate accounted for the most remarkable influence on ICUR in one-way sensitivity analysis. The result of probabilistic sensitivity analysis illustrated that all of the ICURs were located in the fourth quadrant of the cost-utility incremental plot undergone 5000 times of Monte Carlo simulation.

Conclusions

Current universal hepatitis B vaccination program in Beijing was highly cost utility. The investment was reasonable for current universal vaccination program in Beijing.

Introduction

Hepatitis B virus (HBV) is one of the most serious infectious diseases, approximately infected 257 million people worldwide, leading to numerous serious public health issues all over the world¹. It was estimated that at least 90 million people were suffering from diseases related to HBV in China, which imposed heavy economic burden to the government.^2–4 In 2014, the overall HBsAg positive rate of pregnant women was 6.09% in China, meanwhile it’s noted that perinatal transmission of HBV was still the dominant route of HBV infection.^5,6 HBV infection that occurred during infanthood and earlier childhood was more likely developed into chronic hepatitis B infection, and further developed into cirrhosis or hepatocellular carcinoma (HCC).^7,8

The Global Health Sector Strategy on Viral Hepatitis dedicated to eliminate incidence of chronic HBV infection by 2030.^9,10 To achieve this goal, it was important to control HBV infection among children, especially in newborns. HBV vaccine immunization for newborns was the most effective approach to control perinatal HBV infection, which was recommended for all newborns in China since 1992. The first dose was vaccinated within 24 hours of birth, which was extremely vital to prevent perinatal HBV infection, and the following 2nd and 3rd vaccination could boost the protective effect of immunization.¹¹ However, the expense of vaccine was entirely payed by their parents, which could influence the coverage rate of HBV vaccination.¹² Then, Chinese government integrated HBV vaccine immunization into Expanded Program of Immunization (EPI) in 2002, which reduced the financial burden of parents. To expand the coverage of HBV vaccine in less-developed areas, Ministry of Health/Global Alliance for Vaccine and Immunization GAVI Cooperation Project (MOH/GAVI Cooperation Project) was also implemented in 2002.¹³ Since June of 2005, the government decided to bear all the expenditure generated from universal vaccination program, which also meant HBV vaccine was free for all newborns.¹⁴

Beijing, as the capital of China, was the first few cities that implemented HB vaccine immunization for newborns since 1992. Current HB-vaccination included three 10 μg doses of recombinant HB-vaccine for infants regardless their mothers’ HBV status since 2006.^15,16 An official epidemic report revealed that the HBsAg prevalence rate of children under 5 years old declined from 0.59% to below 0.1% in Beijing from 1992 to 2013.^17,18 HBV vaccination program in Beijing has made great progress in controlling HBV infection among children.

Cost-utility analysis serves as a powerful measure in evaluating the economic and health benefit of HBV vaccination program. Studies had been carried out in regions with different HBV epidemic levels. A research proved that universal vaccination program was cost saving and well controlled for long-term prognosis of HBV diseases in Taiwan.¹⁹ A previous study in Gambia provided evidence that HB-vaccine for neonates was cost saving in low-income country.²⁰ With monitored data, Boccalini et al. evaluated the effectiveness of HBV immunization during 3 periods in 20 years and found that the universal vaccination strategy was clinically and economically favorable during the first 20 year in Italy.²¹

Studies in Chinese mainland also illustrated the cost effectiveness of universal HB vaccination. Process of 3 dose of 5 μg HB vaccination was proved to be cost saving for newborns,²² while the implementation cost of government was not included in this study. After that, it was reported that the process of 3 dose of 5 μg HB vaccination could less cost effective than the series of 10 μg HB vaccination due to lower vaccine efficacy.²³ However, in which the parameters of parameters of 10 μg HB-vaccine strategy were inferred based on the 5 μg HB vaccine strategy. In this research, we aimed to evaluate the cost utility of 10 μg HB-vaccine program, which is different from previous studies. Besides, it’s a long-lasting task to conduct economical evaluation on HBV immunization program, due to considerable changes occurred in related epidemic parameters, such as prevalence of HBV infection, vaccination coverage, vaccination cost, and medical cost. Finally, Beijing is one of the largest cities characterized with large population amount, complex population structure and well-designed HBV immunization policy. However, there is no research related to cost-utility of universal HB vaccination which could contribute to explain the cost effective of HB-vaccine strategy in special large city like Beijing. Therefore, we chose Beijing as a representative to conduct economic evaluation of HBV immunization program.

Materials and methods

Decision-Markov model

A decision tree was constructed to represent two alternative scenarios: with universal HB-vaccination program and without vaccination program and followed with Markov model to represent the process of vaccine-protected, HBV infection, and susceptible of HBV infection (Figure 1). In universal vaccination scenario, newborn cohort received three doses of 10 μg HB-vaccine regardless the mothers’ HBV status. Since few infants would quit the full process of immunization, those who didn’t complete the full process of immunization, receiving only one or two doses of HB vaccine were ignored. There were six health status included in HBV infection Markov process: immunity, HBV carriers, chronic hepatitis (CHB), cirrhosis, hepatocellular carcinoma (HCC), and death (Figure 2). Beyond that, infants who were neither protected by vaccine nor undergone perinatal infection would enter the susceptible Markov process, including three more health status than the HBV infection Markov process, which were: susceptible, asymptomatic acute hepatitis and systematic acute hepatitis (Figure 3). The Decision-Markov model was simulated yearly with a cohort of 202349 born in 2016 within a maximum 82 cycles according to their life expectancy^24,25 (Table 1).

Figure 1.

Decision-Markov model of universal vaccination and nonvaccination program

Figure 2.

Prognosis of HBV-infected infants

Figure 3.

Prognosis of HBV-susceptible infants

Table 1.

Parameters of decision-Markov models

	Base value	Range	Distribution	Reference
Chort size	202349	-	-	24
Life span	82	-	-	25
Vaccination rate (first dose)	0.9995	0.9990–1.00	Triangular	Estimated
Rate of vaccine efficacy(Hep3)	0.977	0.932–0.995	Triangular	26
Transition probablity
HBsAg positive rate among mothers Perinatal infection rate of HBsAg mothers	0.031	0.01–0.0386		5,22,27
Universal vaccination	0.059	0.037–0.0926	Triangular	28–30
Nonvaccination	0.4034	0.3228–0.484	Triangular	31
Incidence of AHB ≥1 year	0.03	±50%	Triangular	32
AHB to carriers
<1	0.89	-	-	33
≥1	e^(−0.65*age^0.46)	-	-
Symptomatic		-	-	34
Age<1	0.01	-	-
1≤ age<10	0.1	-	-
Age≥ 11	0.3	-	-
AHB to CHB		-	-
Age≤5	0.25	-	-	35
6≤ age<19	0.06	-	-	36
Age≥20	0.04	-	-	36
Mortality of AHB	0.0041	0.003–0.015	Triangular	22,32
HBV Carriers to immunity		-	-
Age<20	0.012	-	-	34,37
Age≥20	0.0226	-	-	38
HBV Carriers to CHB	0.0269	-	-	39
HBV Carriers to Cirrhosis	0.001	-	-	19
HBV Carriers to HCC	0.002	0.0005–0.0061	Triangular	36
CHB to immunity	0.0005	-	-	32
CHB to cirrhosis	0.02	0.0081–0.027	Triangular	32,34,36
CHB to HCC	0.005	0.003–0.0064	Triangular	34,36
Mortality of CHB	0.014	0.0077–0.0158	Triangular	32,40
Cirrhosis to HCC	0.0465	0.028–0.066	Triangular	22,36
Mortality of cirrhosis	0.0663	0.0243–0.3932	Triangular	32,40
Mortality of HCC	0.5	0.081–0.545	Triangular	22,32,41
Mortality of other causes	Sample Survey Data of 1% of Population in 2015 in Beijing			42
Cost of vaccination (CNY/per dose)	36.86	±25%	Triangular	43
Cost of direct medical treatment(CNY)				Estimated
AHB	16,316.06	±25%	Triangular
CHB	14,743.24	±25%	Triangular
Cirrhosis	32,304.96	±25%	Triangular
HCC	112,324.15	±25%	Triangular
HBV carrier	761.95	±25%	Triangular
Discount rate	0.03	0.00–0.05	Triangular	44
Utility				32
Acute hepatitis B	0.892	±0.142	β
Chronic hepatitis B	0.912	±0.136	β
Cirrhosis	0.755	±0.209	β
Hepatocellular carcinoma	0.712	±0.254	β
HBV Carrier	0.968	±0.081	β

note: 1CNY = 0.15377US dollar in 2016⁴⁵

Parameters

Epidemical data

The risk of perinatal infection depends on mothers’ HBsAg status, and research shows that if maternal HBsAg is positive, the possibility of perinatal infection of vaccinated and unvaccinated infants could be 5.90% and 40.34% respectively.^28–31 Prevalence of HBsAg among pregnant women was reported to be 3.86% in Beijing in 2005, and a seroepidemic investigation in Beijing showed that the HBsAg positive rate was decline by years in every age groups from 2006 to 2014.^15,18 It could predict that HBsAg positive rate also showed a downward trend. We therefore adopted a base value of mothers’ HBsAg positive rate of 3.10% in 2014 in eastern regions of China in this study, and identified a range of 1.00%~3.86% for this parameter.^5,22,27As for infants who did not infected during perinatal period or were not protected by vaccine, the incidence of acute HBV infection among them could be 3.00% after their 1 year-old.³² This parameter was derived from existed study in Beijing and tested at the range of ±50% in sensitivity analysis since the potential underestimation. (Table 1).

Vaccination coverage and efficacy

Beijing was one of the first cities implementing the process of 3 doses of 10 μg HB vaccine.¹⁶ Newborns were required to receive 3 doses of 10 μg HB vaccine in 0-1-6 months (a timely birth-dose followed with two booster doses) in Beijing. Vaccination rate was estimated at the range of 99.90%~100.00%, and the base value for analysis was 99.95% as the vaccination rate was over 99.90% since 2004 according to data from annual work report on Beijing CDC.⁴³ For the infants who completely finished three-dose immunization process, the vaccine efficacy could range from 93.20% to 99.50%.²⁶It was assumed that the protective effect of HBV vaccine would be the same regardless of the maternal HBV infection status and this effect would last for lifelong.

Transmitted probabilities

Parameters of transmitted probabilities in Markov model were acquired from published literatures (Table 1). Perinatal infected infants would start with HBV carrier and immunity status at the rate of 11.00% and 89.00% respectively.^33–39 Unprotected and uninfected infants would start with a susceptible status, and further develop into acute hepatitis state at the rate of 3.00%.³² Acute hepatitis (AHB) would last for maximum 6 months, which was a transient status maintaining for max of one circle.^40,41 People who infected HBV might die from AHB or chronic HBV infection, cirrhosis, and HCC.^32,48 Age-specific mortality rate was derived from Beijing 1% population sample survey report in 2015.⁴² (Appendix)

Parameters of cost

Cost includes vaccination cost and direct treatment cost of HBV-related diseases from a healthcare perspective. Cost of per dose vaccine was derived from public literatures, including cost of vaccine, labor resource, public office expenses and medical consumables generated from Beijing CDC, hospitals and communities.⁴³ Cost of vaccination was adjusted to price level in 2016 using consumer price index (CPI). Direct treatment cost of HB-related diseases was deduced by multiplying average treatment charge for per visit and average visit times per year.^47,48 Average treatment cost per visit was calculated according to treatment record of 124553 patients that extracted from Beijing Health and Medical Price Monitoring Data Platform (BHMP), which was from HIS system of 39 secondary and tertiary-level hospitals in 2016 in Beijing⁴⁷ (Table 1). Average annual visit times was estimated by employing data from the fifth national health service survey in Beijing. Average annual visit times was estimated at 1.38 and 2.39 times for outpatients and inpatients of HCC, and 1.52 and 1.08 times for outpatients and inpatients of other four HB-related diseases (AHB, CHB, cirrhosis, and HBV carriers), respectively.⁴⁸ AHB can be divided into asymptomatic acute hepatitis and symptomatic acute hepatitis, and here we only included the cost caused by symptomatic acute hepatitis. Cost during future years was discounted at the rate of 3.00%.^44–46 Details of direct medical cost are provided in Appendix Table A3.

Parameters of utility

Utility scores were derived from literatures, which were assessed by conducting household investigation with Europe quality-5 dimensions (EQ-5D) in Beijing community.³² Utility score of AHB, CHB, cirrhosis, HCC and HBV carriers were 0.892, 0.912, 0.755, 0.712, and 0.968 respectively. QALY loss scores were obtained by subtracting utility score of each HBV state from the health utility score (health utility score = 1). We assumed that the utility score of asymptomatic acute hepatitis status was the same as general population (health utility score = 1). Utility during future years was discounted at the rate of 3.00%.⁴⁴

Cost-Utility analysis

Cost utility analysis was conducted to analyze and compare the incremental cost-utility ratio (ICUR) of HBV immunization program and nonvaccination program, and then calculated the prevented losses attribute to immunization program. The universal vaccination program was considered to be cost-utility when ICUR ≤ 3 times of the annual per capita GDP (CNY 115,000.00, US$ 17,683.60 in Beijing in 2016) and it was highly cost utility when ICUR does not exceed per capita GDP according to WHO recommendation.^49,50 We further estimated the QALY loss and direct treatment cost of each HB-related disease in different scenarios, to evaluate the health and economic burden due to HBV infection during cohort’s lifetime.

Sensitivity analysis

One-way and a probabilistic sensitivity analysis were conducted to assess the parameter uncertainties. Direct treatment cost, discount rate and some of transmitted probabilities rate varied in one-way sensitivity analysis to find out influence of single parameter uncertainties (Table 1). Probabilistic sensitivity analysis used second-order Monte Carlo simulation with 5000 iterations by setting parameters in different distributions (Table 1). Universal vaccination program was cost utility when the ICURs were located in the fourth quadrant of the ICE scatter plot. Cost data was processed and calculated with EXCEL 2010. Decision-Markov model was constructed and analyzed in TreeAgePro2011 (Tree Age Software, Inc, Williamstown, MA).

Results

Cost utility of universal HBV vaccination

Universal vaccination program could improve total QALY gains, as well as save medical cost. The average cost and QALY gains were estimated within the lifetime of cohort and were presented in Table 2. Compared with nonvaccination strategy, universal vaccination program would save an average cost of CNY 11,072.47(US$ −1702.62) and further lengthen an average of 0.45 QALY gains among the cohort of 202349 newborns. The ICUR was CNY −24,576.61 (US$ −3779.16) for per QALY gained. This result could be considered cost saving according to WHO recommendation.

Table 2.

Average cost and QALYs gains and ICUR of two scenarios

Strategy	Average cost(CNY)	Average QALY gains	ICUR
Unversal vaccination	543.05	30.10	−24,576.61
Unvaccination	11,615.52	29.65
Incremental value	−11,072.47	0.45

Model-predicted disease burden and QALY loss

Direct medical cost and QALY loss due to HB-related diseases under different scenarios within 82 cycles were estimated by Markov model (Table 3). Results showed that universal vaccination program would save direct medical cost of CNY2,262,869,173.50 (US$ 347,962,414.43) and prevent a total loss of 18322.25 QALYs due to HBV-related diseases, among which CHB accounted for 54.17% and 38.86% of medical cost saving and loss of QALY respectively. medical treatment cost-savings due to universal vaccination program has considerably exceeded the government input on HBV vaccination program (CNY 22,364,564.54, US$ 3,439,009.19).

Table 3.

Direct treatment cost and QALY loss of HB-related patients under different scenarios

	Direct treatment cost (CNY)			Loss of QALYs
HB diseases	Universal vaccination	Nonvaccination	Prevented value	Universal vaccination	No vaccination	Prevented value
AHB	6,417,040.52	292,636,257.07	286,219,216.55	43.82	1998.19	1954.37
CHB	47,407,437.29	1,213,027,955.08	1,165,620,517.79	281.70	7188.84	6907.14
Cirrhosis	16,124,433.30	408,475,499.25	392,351,065.95	120.81	3032.88	2912.07
HCC	11,661,511.70	291,868,298.68	280,206,786.98	29.10	708.27	679.17
HBV carrier	5,910,016.05	144,381,602.28	138,471,586.23	249.40	6118.90	5869.50
total	87,520,438.86	2,350,389,612.36	2,262,869,173.50	724.83	19047.08	18322.25

Sensitivity analysis

According to the result of one-way sensitivity analysis, parameters that following parameters have a significant impact on ICUR, including discount rate, mortality of HCC, mortality of cirrhosis, direct medical cost of CHB, and mortality of CHB. While none of single parameter could change the conclusion that universal vaccination program was highly cost utility. Result of probabilistic sensitivity analysis indicated that all of the ICUR scatter points (5000 Monte Carlo simulations) were located in the fourth quadrant of the cost-utility incremental plot (Figure 4), which identified that the model was robust and reliable even taking uncertainties of each parameter into account.

Figure 4.

Incremental cost-utility plane for vaccination vs. nonvaccination from healthcare perspective of 5000 simulations

Discussion

Universal vaccination program was free for all the newborns in Beijing since 2005, which greatly expanded the coverage of HBV vaccination. Based on economic evaluation, universal vaccination program in Beijing could save an average of CNY 24,576.61 (US$ 3779.16) when one more QALY gained. A similar study conducted in China reported that within 100 circles, the ICER was US$ 1708.06 for per QALY gained for universal vaccination program.²² The average cost and utility of universal vaccination were estimated at CNY 2225.74 and 26.88 QALYs in Zhejiang province.³¹ Average QALY gained in these studies were lower than that in our study, the reason might lie in the lower utility scores in our study especially for general population. A previous study, conducted in a high epidemic area (HBsAg positive rate of pregnant women was 9.50%) of Taiwan, presented that universal vaccination would save US$ 5715 when acquiring one more QALY from perspective of healthcare^19. But it was not directly comparable because the parameter of utility was not discounted to the birth year.

Chronic hepatitis infection was still accounted for a largest proportion of HBV infection regardless of with or without HBV vaccination program. It was estimated that a sum of 81.23% of direct medical cost and 57.30% of QALY loss attribute to CHB, while cirrhosis and HCC would be prevented by implementing the universal vaccination program. According to one sero-epidemic investigation report, prevalence of HBsAg was 5.49% among Chinese population and 7400 million people were predicted to suffer from chronic hepatitis infection in 2014.⁵¹ Therefore, it was necessary for the government to keep funding this program, for the sake of prevention of casualties and reduction of expenses due to HBV infection.

In this study, direct economic cost of HB-related diseases was calculated based on the medical information of 124553 patients from 39 secondary and tertiary-level hospitals in Beijing. A previous study estimated the medical cost of HBV-related patients in community and hospital in Beijing,⁵² and reported that the direct medical cost of CHB was CNY 5059.90, which was remarkably lower than results in our study (CNY 14,743.24 for CHB). It could be explained that patients receive treatment at community experienced less severe illness than those at secondary and tertiary hospitals. Moreover, the direct medical cost of HBV carrier in Li’s research was higher than that in our study (CNY 2114.98 versus CNY 761.95), which could be caused by that the cost generated from pharmacy medicine and private clinic treatment was not included in our study.⁵³

There were several limitations in our study. Firstly, only universal vaccination program was considered in this study, which might overestimate the proportion of vertical transmission from mothers to children. However, it might not necessary to inject one more dose of HBIG for all of children that born to HBsAg positive mothers. A study conducted in China presented that 3 doses of 10 μg HB-vaccine could sufficient for children that born to HBsAg positive and HBeAg negative mothers. Moreover, anti-HBs GMC induced by HBIG might result in a rapid growth in short-term, and it could even lower than those who only received Hep3 in 7 and 12 months after vaccination.²⁶ But it was necessary to monitor the level of maternal HBV DNA, because intrauterine infection might occur when the level of maternal HBV DNA was higher than 10⁷ IU/ml.^26,54 Secondly, this study was based on the assuming that the protective effect of vaccination would last for lifelong, while the protection of HBV vaccine would weaken by age.⁵⁵ In addition the herd immunity was ignored in our study for using a Markov model rather than a dynamic model. But it was considered to be sufficient for a high vaccine coverage. Finally, medical cost generated from pharmacy and privacy clinics was not included in our study, which might underestimate the direct medical cost of HB-related diseases especially in CHB and HBV carriers.

In conclusion, the current universal vaccination program in Beijing was highly ‘cost utility.’ It could improve the QALY of the whole population and contribute to less cost. This strategy could significantly reduce the heavy economic burden caused by HBV-related diseases in Beijing, so it was necessary for government to keep continuous investment funding in the future. Results in this study were robust and could provide a reliable evidence for further vaccine policy making.

Appendix.

Table A1.

Characteristics of socio-demographic variables of HB-related patients in 2016

	AHB		CHB		Cirrhosis		HCC		HBV Carriers
	Outpatient (%)	Inpatient (%)	Outpatient (%)	Inpatient (%)	Outpatient (%)	Inpatient (%)	Outpatient (%)	Inpatient (%)	Outpatient (%)	Total (%)
Gender (%)
Male	41(67.21)	21(63.64)	69685(65.11)	1277(68.25)	4986(63.55)	1214(70.62)	346(73.15)	863(81.11)	1854(41.51)	80287(64.46)
Female	20(32.79)	12(36.36)	37335(34.89)	594(31.75)	2860(36.45)	505(29.38)	127(26.85)	201(18.89)	2612(58.49)	44266(35.54)
Age group (%)
x ≤ 30	22(36.07)	5(15.15)	20156(18.83)	482(25.76)	223(2.84)	24(1.4)	12(2.54)	6(0.56)	1731(38.76)	22661(18.19)
30 < x ≤ 40	18(29.51)	14(42.42)	32656(30.51)	535(28.59)	652(8.31)	125(7.27)	5(1.06)	26(2.44)	1580(35.38)	35611(28.59)
40 < x ≤ 50	15(24.59)	5(15.15)	22.90	434(23.2)	1678(21.39)	339(19.72)	77(16.28)	135(12.69)	711(15.92)	27903(22.4)
50 < x ≤ 60	1(1.64)	5(15.15)	18931(17.69)	279(14.91)	2738(34.9)	648(37.7)	173(36.58)	414(38.91)	333(7.46)	23522(18.89)
60 < x	11.90	3(9.09)	10768(10.06)	119(6.36)	2555(32.56)	575(33.45)	206(43.55)	481(45.21)	111(2.49)	14823(11.9)
Missing value	0(0)	1(3.03)	0(0)	22(1.18)	0(0)	8(0.47)	0(0)	2(0.19)	0(0)	33(0.03)
Total	61(100)	33(100)	107020(100)	1871(100)	7846(100)	1719(100)	473(100)	1064(100)	4466(100)	124553(100)

^aICD-10code of HB-related diseases: AHB-B16, CHB-B18, Cirrhosis-K74, HCC-C22, HBV carrier-Z22

^bAverage age of outpatients/inpatients: 43.18/49.99

^cMissing value represented individuals whose information of age was lost but with complete information of medical charge.

Figure A1.

Selective standard of out/inpatients from beijing health and medical price monitoring data platform

Table A2.

Death rate data of 1% of population in 2015 in Beijing

Age group	Total population	Death population	Death rate (‰)
0–4	15569	2	0.128460402
5–9	12720	-	-
10–14	8092	-	-
15–19	10719	-	-
20–24	22750	2	0.087912088
25–29	36373	7	0.192450444
30–34	35943	3	0.083465487
35–39	27723	9	0.32464019
40–44	26742	10	0.373943609
45–49	26127	22	0.842040801
50–54	26904	50	1.858459709
55–59	23959	53	2.212112359
60–64	22325	65	2.911534155
65–69	13996	78	5.573020863
70–74	9079	124	13.65789184
75–79	8709	185	21.24239293
80–84	5757	231	40.12506514
85–89	2411	171	70.92492742
90–94	687	81	117.9039301
95–99	130	23	176.9230769
100~	21	5	238.0952381
total	336729	1120	3.326116848

Beijing 1% population sample survey in 2015. (2017). Office for Beijing 1% Population Sample Survey, Beijing Municipal Bureau of Statistics. China Statistics Press.

Table A3.

Direct treatment cost in 2016 in Beijing (CNY)

HB diseases	Outpatient	Inpatient	Total
AHB	1,113.30	15,202.76	16,316.06
CHB	1,958.91	12,784.33	14,743.24
Cirrhosis	1,579.30	30,725.66	32,304.96
HCC	2,078.17	110,245.98	112,324.15
HBV carrier	761.95	-	761.95

The annual direct treatment cost of HB-related diseases was deduced by multiplying direct treatment cost for per visit and average visit times per year of HB-related out/inpatients. The average visit times per year of out/inpatients due to HCC and other four kinds of HB-related diseases were 1.38/2.39 and 1.52/1.08 respectively, which was deduced by employing data from National Health Services Surveys in 2013.

Funding Statement

This study was partly funded by Beijing municipal science & technology commission [Grant no. D161100002716005].

Author contributions.

While conducting this study, Yiwei Guo played a role in putting forward the idea as well as analyzing these data and drafting the first edition of this paper. Yong yang, Qian Bai, Zhengwei Huang, Zongwu Wang, Dongxia Cai and Shuo Li played a role in editing and reviewing the manuscript. Xiaowei Man played a large role in collecting these data, developing the idea for manuscript. Xuefeng Shi played an important role in developing the idea and revising the manuscript.

Disclosure of potential conflicts of interest

None of the authors has any conflicts of interest.