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An extended cost-effectiveness analysis of schizophrenia treatment in India under universal public finance
Cost Effectiveness and Resource Allocation volume 14, Article number: 9 (2016)
Schizophrenia remains a priority condition in mental health policy and service development because of its early onset, severity and consequences for affected individuals and households.
Aims and methods
This paper reports on an ‘extended’ cost-effectiveness analysis (ECEA) for schizophrenia treatment in India, which seeks to evaluate through a modeling approach not only the costs and health effects of intervention but also the consequences of a policy of universal public finance (UPF) on health and financial outcomes across income quintiles.
Using plausible values for input parameters, we conclude that health gains from UPF are concentrated among the poorest, whereas the non-health gains in the form of out-of-pocket private expenditures averted due to UPF are concentrated among the richest income quintiles. Value of insurance is the highest for the poorest quintile and declines with income.
Universal public finance can play a crucial role in ameliorating the adverse economic and social consequences of schizophrenia and its treatment in resource-constrained settings where health insurance coverage is generally poor. This paper shows the potential distributional and financial risk protection effects of treating schizophrenia.
Schizophrenia poses a considerable public health and social policy challenge because of its severity, its often catastrophic effect on the welfare and income of family members and the significant risk that patients will suffer severe human rights violations. The provision and effective coverage of care and treatment for severe mental disorders such as schizophrenia in India is limited, both in terms of access to services and financial protection or insurance. Efforts to scale up community-based public mental health services can contribute strongly to greater equality of access, since such services will serve more people in need and with less reliance on direct out-of-pocket spending.
This paper considers this claim through an innovative approach to economic evaluation called ‘extended cost-effectiveness analysis’ . ECEA goes beyond conventional cost-effectiveness analysis (CEA) by not only considering the distribution of costs and outcomes across different socioeconomic groups in the population, but also by explicitly examining the extent to which interventions or policies protect households against the financial risk of medical impoverishment [1, 2]. Taking into account current debates in India about appropriate pathways towards universal health coverage, we focus in this paper on the impact of enhanced public financing and provision of schizophrenia treatment on health and financial outcomes, including increased uptake of treatment (leading to more health gain), reduced out-of-pocket treatment costs and greater insurance against catastrophic health expenses. Assessment of these various consequences provides new, evidence-based insights to national policy makers responsible for setting priorities and allocating resources in the health sector.
ECEA builds on the evidence already generated through the standard application of cost-effectiveness analysis to schizophrenia treatment in resource-constrained developing countries, in which the focus is on the relative costs per unit of health gain. Patel et al. reviewed the cost-effectiveness of select mental disorders and conclude that first-generation antipsychotic drugs in low-income and middle-income countries and their benefits can increase through psychosocial treatments at the community level . Chisholm et al. analyzed the cost-effectiveness of first- and second-generation antipsychotic drugs—alone or in combination with psychosocial counseling—in Chile, Nigeria and Sri Lanka and found that community-based outpatient provision of older (first-generation) antipsychotic drugs and psychosocial treatment is the most cost-effective intervention. Moreover, the estimated cost of increasing treatment coverage through a community-based service model together with efficient treatment options is very low (investment of <Int.$1 per capita) . Chisholm and Saxena evaluated the comparative costs and effects of a package of interventions in sub-Saharan Africa and Southeast Asia for a cluster of five neuropsychiatric conditions, including schizophrenia and found that neuroleptic antipsychotic drugs and psychosocial treatment were the most cost-effective intervention for schizophrenia . Phanthunane et al. surveyed patients seeking treatment for schizophrenia in Thailand to provide detailed breakdown of the costs involved in schizophrenia treatment including health care costs and productivity losses to patients and families . In Kenya, de Menil et al. find that a community based intervention is cost-effective and achieves increasing returns over time but may not be affordable for the Kenyan government . Cost-effectiveness studies on chronic schizophrenia treatments have also compared the efficacy of typical (first-generation) versus atypical (newer) drugs in low-resource settings, such as China and Thailand [8, 9]. Clinical studies from high-income country settings evaluate cost-effectiveness and compliance rates of first- versus second-generation antipsychotic drugs using pharmaco-economic analysis and find the latter to have a higher cost-effectiveness and better safety profile [10, 11].
We constructed an equation-based, static (single year) model of the expected costs, health outcomes and financial risk protection effects (including averted private out-of-pocket expenditures) associated with a policy of enhanced public financing of schizophrenia treatment in India. While UPF in India has previously been available for specific diseases such as AIDS, it has recently moved toward secondary and tertiary care insurance coverage in the form of programs such as Rashtriya Swasthya Bima Yojana aimed at providing financial protection against catastrophic health expenses. However, such schemes currently exclude treatment of mental disorders and consequently, there has been no quantitative assessment of the amount of financial protection that a UPF scheme can provide against schizophrenia treatment. Since this is the first application of ECEA to be carried out in the context of mental disorders, our first goal was to test its applicability and assess its internal validity. We accomplished this by constructing a series of equation-based ECEA models that employed the same epidemiological and treatment cost-outcome input data used in previous CEA studies in the context of South-East Asia . Additional information output from the ECEA model—particularly the estimated value of financial risk protection arising from public financing of health care costs—could then be readily interpreted with reference to this earlier published work. We subsequently adapted or updated model input parameters to better reflect the current situation and evidence base for schizophrenia treatment in India (the model is available from the authors on request).
In this model, all persons treated for schizophrenia in non-specialized health care settings receive a combination of first-generation antipsychotic drugs as well as basic—or, for a small proportion, intensive—psychosocial treatment. First-generation antipsychotic medication is either tablet doses of haloperidol-chlorpromazine or an injection of fluphenazine, with biperiden administered for side effects. The second-generation antipsychotic medication considered is tablets of risperidone. We use a weighted average of these anti-psychotic medications with basic psychosocial treatment as a single treatment package. After the implementation of UPF, 80 % of the population that needs treatment would receive publicly financed care (target coverage). The average treatment coverage rate for schizophrenia is 40 % based on a World Health Survey study from 2003 on coverage of schizophrenia treatment in 6 states in India . Due to increased detection and healthcare utilization rates among the richer socioeconomic groups, we distribute the coverage rates to range from 30 % in the poorest income group to 50 % in the richest.
For this model, all patients treated for schizophrenia are assumed to receive a combination of antipsychotic drugs and basic psychosocial treatment; 90 % receive haloperidol or chlorpromazine with biperiden (for side effects) and the remaining 10 % receive a fluphenazine injection. Fifteen percent are assumed to receive inpatient psychiatric care in a short-term community-based psychiatric unit, 2 % are long-term community-based residential patients and 50 % have outpatient visits (for follow-ups) . Finally, 10 % of treated patients are modeled to receive more intensive, individual-based psychological treatment. Table 2 presents the costs of all the treatment resources used as inputs in the model. Average per unit treatment costs are sourced from the mhGAP costing tool for India, based on the study site of Sehore district in Madhya Pradesh, India. The mhGAP costing tool values tradable healthcare goods such as medicines and diagnostic equipment at international prices adjusted for shipping and distribution costs. Default drug prices are from the International Drug Price Indicator Guide. Costs of non-tradeable healthcare goods in the form of local personnel, in-patient and out-patient care, consumables, building costs and utilities are predicted using the WHO-CHOICE costing database . As Table 2 indicates, the average annual schizophrenia treatment cost per case under a policy of universal public finance is approximately $177 (2012 USD). This does not include direct non-medical costs such as transport, time and opportunity costs.
We use disability-adjusted life years (DALYs) as the health outcome to evaluate the consequences of enhanced public financing for schizophrenia treatment. However, since schizophrenia treatment is accorded with no direct mortality effect, DALYs were estimated using the prevalent YLD method:
Data on schizophrenia prevalence rates are from the Global Burden of Disease study’s 2010 DisMod-MR output . These rates are stratified by region, age group and gender. Disability weights for residual and acute cases are 0.576 and 0.756 respectively, where zero refers to no disability ; we use a weighted average composite disability weight based on time spent in a state of acute (20 %) versus residual (80 %) schizophrenia, where acute specifically refers to time spent in a continuous florid state (typically lasting 4–8 weeks). Our definition of acute schizophrenia and the associated distribution of time spent in this acute state is different to that reported by Ferrari et al.  who estimate on the basis of six studies that 63 % of cases (not time spent) are acute and only 37 % of cases are residual. Our composite disability weight of 0.61 is very much in line with WHO and other previous estimates of the average level of disability associated with schizophrenia. To calculate improvements in disability compared to (untreated) natural history, treatment effect sizes reported in the literature were converted into an equivalent change in disability weight ; this resulted in a proportionate improvement in the disability weight of 24 % [13, 17, 18]. Adherence to treatment is set to be 76 % for treatment with first- or second-generation mediation .
Value of insurance
Following Verguet et al.  we calculate the expected value of a gamble concerning the cost of treating schizophrenia without UPF at the individual level, as follows:
where p = overall probability of receiving care for schizophrenia (calculated as, coverage*prevalence rates per quintile), c = treatment cost and y = income. Risk aversion is used here as a characteristic of people’s utility function. Specifically, to estimate financial risk protection of the policy, we first estimated the individual’s expected income before public financing, which depends on treatment coverage and associated out-of-pocket costs. An individual’s certainty equivalent is then estimated by assigning individuals a utility function that specifies their risk aversion, which is equivalent to calculating their willingness to pay for insurance against the risk of medical expenditure. The certainty equivalent, assuming a coefficient of relative risk aversion r, is
Money metric value of insurance v(p, y, c) at the individual level is then
The total insurance value per quintile of income is
Analysis of the distribution of costs and effects across income groups
To perform a quintile-based income analysis, we assume an evenly distributed cohort size of 200,000 individuals in a population of 1 million. Concerning prevalence, we apply DisMod’s epidemiological indicators for South Asia to a large household survey in India: Round 3 of the District Level Household and Facility Survey . DLHS-3, conducted in 2007–08, is a nationally representative data set on reproductive and child health indicators, covering 720,320 households and over 3.7 million individuals from 601 districts across India . The survey reports demographic information (age, gender, socioeconomic status) for each member of the household and also computes a wealth quintile for each individual based on her household’s composition of owned assets. To each such individual in the DLHS-3 sample, we assign the relevant schizophrenia prevalence rate from DisMod, based on the individual’s age and gender. Thus, the DLHS-3 sample now has information on every individual’s prevalence rate for schizophrenia, besides her gender, age in completed years and wealth quintile. Using sampling weights, we then derive a weighted average prevalence rate for each income quintile, assuming the DLHS-3 wealth quintiles are a good approximation of the income quintile distribution in India. The prevalence rates per income quintile are presented in Table 1. As seen in the table, these rates increase with higher income groups. This is a reflection of the demographic composition of the DLHS-3 sample. Data from DisMod indicates that the age-group with the highest rate of prevalence is 20–24 years followed by 25–34 years for both males and females. Demographic composition of the DLHS-3 sample suggests that proportions of these two high-prevalence age groups increase with higher income quintiles; individuals in these age-groups together constitute 20 % of the poorest quintile, 22 % of the second quintile, 24 % of the middle quintile, 26 % of the richer quintile and 28 % of the richest quintile. Thus, the observed increase in prevalence rates with income is because the relative sample shares of the age-groups with the highest prevalence rates increase with income owing to the demographic composition of the survey data.
For calculating current average monthly per capita gross domestic product (GDP) per income quintile, we used the World Bank’s Poverty Calculation Net (PovCalNet) tool , which reports the share of each decile as a proportion of the total monthly consumption of India based on a sample of households surveyed in 2009. The consumption shares by decile are based on estimated Lorenz curves; households are ranked by consumption per person and distributions are population (household size and sampling expansion factor) weighted. Based on the consumption shares, which range from 3.7 % in the lowest decile to 28.8 % in the highest decile, we create a multiplier for each quintile based on its relative share of consumption. This is done by taking each quintile’s percentage share of consumption and dividing it by the average percentage share across all the quintiles. This gives us a relative weight for each quintile that is further multiplied by the annual GDP per capita of $1500 (current USD) to calculate the average annual GDP per capita for each quintile, which ranges from $641 in the poorest quintile to $3211 in the richest quintile (Table 1) .
To evaluate the consequences of UPF for private (OOP) expenses toward schizophrenia treatment, we first estimate the quintile-specific total treatment costs under current coverage rates as well as under the scenario where UPF targets 80 % coverage. We assume that at least 70 % of the total treatment costs are borne OOP by individuals across all quintiles [24, 25]. We then estimate the quintile-specific OOP expenses incurred by individuals in the absence of UPF and those averted under UPF’s target coverage of 80 %. We also report the additional costs to the government from providing UPF across quintiles.
In this section, we present quintile-based outcomes of standard cost-effectiveness of UPF relative to the current treatment scenario for schizophrenia, where treatment is a combination of first- and second-generation antipsychotic medication with basic psychosocial treatment (Table 3). Regarding health gains from UPF: extending schizophrenia treatment from baseline coverage rates (ranging from 30 to 50 % across quintiles) to a target coverage rate of 80 % for all quintiles under UPF, averts an extra 22 to 28 DALYs per quintile population of 200,000 persons, for a total of 122 averted DALYs per one million population. The estimated burden of disease per one million population is 1704 DALYs and the currently averted burden is 126 DALYs, so this is equivalent to doubling the averted burden (from 7 to 14 % of disease burden).
As seen in Table 2, the total annual cost of treatment per case is USD $177.42. In the absence of UPF, the total annual costs of treatment per quintile range from $26,721 in the poorest to $57,059 in the richest quintile. Extending treatment to 80 % of the population increases the total annual treatment costs, ranging from $71,257 in the poorest quintile to $91,295 in the richest quintile. The cost per capita is $0.36 for the poorest quintile and $0.46 for the richest quintile. This yields a cost- effectiveness ratio of USD $1589 per DALY averted for each income quintile. The cost-effectiveness ratio is stable across income groups because the extra cost associated with reaching target coverage in the lower income quintiles is offset by a commensurate improvement in health outcomes (Table 2).
As discussed earlier, in the absence of UPF, private individuals in India incur a large share of total treatment costs. With UPF, this cost burden will be transferred to the government. The impact of UPF on private costs averted is shown in Table 3. The total OOP private expenditure averted due to UPF is estimated at $276,623. Moreover, it increases across income quintiles, ranging from $49,880 for the poorest quintile and $63,906 for the richest quintile. OOP expenditures are mainly a function of prevalence rates, coverage rates and the percentage share of health expenses that are out-of-pocket and unit cost per case. Since unit cost of treatment per case ($177. 4) and the percentage of total expenses that are paid OOP (70 %) are assumed constant across all quintiles, this upward trend in OOP expenses averted from UPF is mainly a reflection of average prevalence rates rising with income and the gradient of current coverage rates across quintiles as seen in Table 1.
Under this scenario, if 80 % of a population of one million is targeted for coverage through UPF, the government must meet a total cost of $395,176 per one million individuals.
Figure 1 compares the quintile distribution of public health spending on schizophrenia treatment under current coverage (ranging from 30 to 50 %) versus that under UPF’s target coverage of 80 %. Under current coverage, distribution of public health spending accords with evidence in Mahal et al. of a regressive pattern of health spending that disproportionately favors the rich; this is mainly a manifestation of higher treatment coverage rates among the richer groups . Introduction of UPF flattens this distribution, thus creating distributional consequences of universalizing healthcare coverage and costs.
Value of insurance
An additional financial consequence of a health intervention such as UPF is the money metric value of insurance, which is the amount an individual is willing to pay to receive risk protection i.e., to be in a healthy state vis-à-vis a poor health state. The total annual value of insurance from UPF for the entire population of 1 million is USD $24,582. The value is the highest for the lowest income quintile and decreases as income rises. The annual insurance value for the poorest quintile is USD $7282, which is approximately 30 % of the total value (Fig. 2). The second income quintile has an annual insurance value of USD $5587; the third income quintile, $4972; and the fourth income quintile, $4302. The highest income quintile has an annual insurance value of USD $2439, which is approximately 10 % of the total value.
To test the reliability of our model predictions based on plausible ranges of the input parameters derived from various sources, we performed an uncertainty analysis with 1000 simulations . Under the Latin hypercube sampling (LHS) scheme, a probability distribution is constructed for each input parameter that is not known with certainty. Input parameters that are known with large certainty, either because they are fixed values constructed for the simplicity of the model (such as population/cohort size) or because they are reliable values derived from large, nationally representative Indian survey datasets are excluded from the model. Table 4 describes the baseline values and the assumed range and distributions for those input parameters that are likely to be affected by uncertainty, either because they are aggregate, regional estimates not specific to India, or because they are based on local village-level field studies with small sample sizes that may not be representative of the country as a whole. In case of current coverage rates, we consider two alternative average current coverage rates of 20 % (pessimistic case) and 50 % (optimistic case) in Table 4. We specified a plausible range of minimum and maximum values for the uncertain parameters based on available literature or on assumptions made by the working team. Figure A1 shows the summary statistics from the LHS scheme with 1000 simulations for three outcomes—DALY averted, OOP expenses averted and money metric value of insurance—in the form of box plots representing quartile values for each income quintile. Please see Additional file 1 for the box plots. We do not show the corresponding boxplots for cost-effectiveness ratio here since the ratio is constant across quintiles. The summary statistics for this outcome are included in Table 3. Tables 5, 6 present the values including means for all four outcomes in tabular form. Reducing current coverage by half, for example, reduces the current averted burden (as well as the value of insurance) by 50 %, but also reduces the costs and averted private expenditure associated with current treatment by this proportion, thereby resulting in no change in cost-effectiveness. It is worth mentioning that the relatively larger variation across quintiles for value of insurance is most likely due to the variation in prevalence rates, which range from 0.251 % (Q1) to 0.322 % (Q5). This variation in prevalence is due to the age distribution of the DLHS-3 sample as explained earlier.
While existing research considers the cost-effectiveness of schizophrenia treatment in low-resource settings including India, our paper considers the extension of the current literature to evaluate the cost-effectiveness of publicly financed schizophrenia treatment in India and includes the non-health financial benefits of UPF to private individuals or households. Our results show that when current coverage is extended to 80 % under UPF, health gains in terms of DALYs averted from UPF are the highest among the poor; however, these gains come at a higher cost for the poorest quintile, since UPF covers a larger proportion of this income group vis-à-vis the richest.
The money metric value of insurance is a quantifiable measure of financial protection under UPF and this ECEA illustrates that it is feasible to design essential packages of publicly financed health services to include financial protection as an additional outcome besides health gains. We see a relatively modest downward trend in the insurance values from the lowest income quintile to the highest income quintile; risk protection from UPF would accrue primarily to low-income groups. Total value of insurance is USD $24,582 to one million population, of which, 30 % accrues to the poorest income quintile.
Finally, we offer a few caveats on the results. The model remains limited in scope because of the paucity of reliable data for India on mental disorders and schizophrenia in particular. Many of the epidemiological and efficacy parameter values used in this analysis rely on regional (South Asia) estimates. Data on treatment costs come largely from the mhGAP costing tool, which is based on a small sample of individuals from a relatively small study site in India (Sehore, Madhya Pradesh); estimates on costs of services may therefore not be representative at the national level. Moreover, we did not estimate all potential costs incurred by service users, such as the transportation, time and opportunity costs involved in receiving treatment.
There are no reliable data on key input parameters disaggregated by income levels. For example, we expect treatment costs to vary by income but we do not have data on income-specific treatment costs. Likewise, we also expect treatment effectiveness and adherence rates to vary by income quintiles. Similar to treatment coverage rates, adherence rate for poorer quintiles may be lower as low-income households may face additional constraints to access care and supply issues may affect availability of drugs at the health facility level; however, lack of data on variation of treatment adherence rates by income for mental disorders in India limits our analysis to assuming a constant adherence rate in the model.
A further concern is the use of DALYs as a measure of health outcome for schizophrenia treatment. Although DALYs are a useful measure of the efficiency of schizophrenia care relative to other health investments, they do not deal with comorbidity and cannot reflect the effect of treatment on the patients’ families . In this analysis, we only assessed the impact of treatment on reducing the non-fatal burden of diseases associated with schizophrenia (measured in terms of years lived with disability or YLD); although schizophrenia is clearly associated with excess mortality, effects on this dimension of disease burden (measured in terms of years of life lost) were not included since there is insufficient evidence to suggest that the psychosocial and pharmacological interventions modelled here lead directly to a reduction in mortality.
Lastly, although the paper extends standard cost-effectiveness analysis to include certain financial outcomes, we do not account for non-health benefits of treatment in the form of workforce and household productivity gains. A cost-benefit analysis would be needed to measure those effects.
disability adjusted life year
district level household survey-3
extended cost effectiveness analysis
gross domestic product
Mental Health Gap Action Programme
Universal Public Finance
years lived with disability
years of life lost
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AN conducted literature search and provided input parameters for the model. AN, NR and DC conducted analysis for the model. NR, AN and DC wrote the manuscript. All authors read and approved the final manuscript.
The authors would like to thank the Bill & Melinda Gates Foundation for their generous funding through the Disease Control Priorities Network grant to the University of Washington. We also thank Rahul Shidhaye, Vikram Patel and Ramanan Laxminarayan for their valuable comments and insights for the analysis. Moutushi Majumder provided research assistance in gathering key input parameters and preparing tables for the manuscript. Patrick Renschler provided assistance with the sensitivity analysis.
Dan Chisholm is a staff member of the World Health Organization. The authors alone are responsible for the views expressed in this publication and they do not necessarily represent the decisions, policy or views of the World Health Organization.
The authors declare that they have no competing interests.
This study was funded by the Bill & Melinda Gates Foundation under the Disease Control Priorities Network grant to the University of Washington.
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Raykar, N., Nigam, A. & Chisholm, D. An extended cost-effectiveness analysis of schizophrenia treatment in India under universal public finance. Cost Eff Resour Alloc 14, 9 (2016) doi:10.1186/s12962-016-0058-z
- Value of insurance
- Cost-effectiveness analysis