Abstract
Inequity in healthcare utilization is typically measured as the unequal distribution of services by observable non-need indicators, such as income, after controlling for observable need indicators. However, important sources of unequal healthcare utilization are often unobserved. The unobserved element may reflect need factors, such as imperfectly measured severity of illness, that would predict greater utilization across different healthcare channels, but also based on choice, such as patient preferences to use a particular healthcare channel over an alternative one, which may differ in its effect between channels. Accounting for unobserved sources of utilization may, therefore, help to understand contradictory inequalities between different healthcare channels, such as pro-poor inequalities for general practitioner use and pro-rich inequalities for specialist visits. This paper uses survey data from the Household Income and Labour Dynamics in Australia and panel data methods to investigate if seemingly contradictory inequalities between different healthcare channels are explained by latent individual-level heterogeneity. Results show that unobserved individual-level heterogeneity affects inequities across different healthcare channels, providing indications that the unobserved element may primarily represent unobserved need.
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Notes
Some unmet need may be self-chosen [2], corresponding to what we refer to as “preferences”.
This definition of the Australian (reference) population does not include diplomatic personnel of overseas governments and members of non-Australian defence forces, or non-Australian individuals who stayed or intended to stay in Australia for less than one year. Institutions include hospitals, health care institutions, military and police installations, correctional and penal institutions, convents and monasteries, hotels, and motels.
Data until wave 11 are, therefore, representative of the reference population in 2000 and data from wave 11 are representative of the reference population in 2010. However, due to cross-wave attrition and imperfect coverage of variables, a given sample may not be representative of either of these two reference populations.
Our restriction of the sample to those over the age of 25 is used to account for the fact that education attainment typically increases until individuals are in their mid-20s, making it more difficult to interpret different individual circumstances that affect employment, income, and education, as some individuals may be studying or working, and the importance of these variables may take a different meaning depending on whether they live independently or with family. However, these transitory life stages are typical for individuals less than 25 years old.
Hausman tests confirm that fixed effects are preferred over random effects for all models.
We cluster standard errors at the individual level.
Coefficient estimates for need are omitted, and their inclusion described by indicators. The SM includes the full results for all three channels of healthcare utilization.
Our classification for being not in the labour force includes individuals not marginally attached to the labour force, hence individuals who are likely to look for work if the labour market circumstances change. By contrast, those outside the labour force but marginally attached, including individuals who are generally interested in working, are grouped with unemployed individuals.
Note that we use HILDA, while Van Doorslaer et al., [27] and Hajizadeh et al., [10] use data from the Australian National Health Surveys. Both are representative of the population, but we do not use population weights to ensure representativeness of our results and, based on our understanding, also previous papers did not use population weighting, making results only partially comparable.
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Fooken, J., Jeet, V. Using Australian panel data to account for unobserved factors in measuring inequities for different channels of healthcare utilization. Eur J Health Econ 23, 717–728 (2022). https://doi.org/10.1007/s10198-021-01391-0
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DOI: https://doi.org/10.1007/s10198-021-01391-0