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Risk adjustment and observation time: comparison between cross-sectional and 2-year panel data from the Medical Expenditure Panel Survey (MEPS).

Chao YS, Wu CJ, Chen TS - Health Inf Sci Syst (2014)

Bottom Line: The results of this technique were not satisfying.One reason could be that the length of time to document consumption might be associated with the mean and variance of observed health care consumption.The reason is not clear and we will continue studying this phenomenon.

View Article: PubMed Central - PubMed

Affiliation: School of Public Health, University of Alberta, Edmonton, Alberta T6G2T4 Canada.

ABSTRACT

Background: Risk adjustment models were used to estimate health care consumption after adjusting for individual characteristics or other factors. The results of this technique were not satisfying. One reason could be that the length of time to document consumption might be associated with the mean and variance of observed health care consumption. This study aims to use a simplified mathematical model and real-world data to explore the relationship of observation time (one or two years) and predictability.

Methods: This study used cross-sectional (one-year) and 2-year panel data sets of the Medical Expenditure Panel Survey (MEPS) from 1996 to 2008. Comparisons of the health care consumption (total health expenditure, emergency room (ER) and office-based visits) included ratios of means and standard errors (SEs). Risk adjustment models for one- and two-year data used generalized linear model.

Results: The ratios of mean health care consumption (two-year to one-year total expenditure, ER and office-based visits) seemed to be two in most age groups and the ratios of SEs varied around or above two. The R-squared of two-year models seemed to be slightly better than that of one-year models.

Conclusions: We find health expenditure and ER or office-based visits observed in two consecutive years were about twice those observed in a single year for most age, similar to the ratios predicted in mathematical examples. The ratios of mean spending and visits varied across age groups. The other finding is that the predictability of two-year consumption seems better than that of one-year slightly. The reason is not clear and we will continue studying this phenomenon.

No MeSH data available.


Related in: MedlinePlus

Average health expenditure and the 95% confidence intervals observed in 1- and 2-year periods by age (0 to 85 years).
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Fig1: Average health expenditure and the 95% confidence intervals observed in 1- and 2-year periods by age (0 to 85 years).

Mentions: Figure 1 (and Additional file1: Table S1) presents the mean health spending of all ages (0 to 85 years) observed in one or two-year periods from 1996 (13 years or 13 2-year panels in total). The spending distribution looks like J-shape. Mean expenditure is high at age zero and then decreases with ages, until 10 years of age. The increase of health spending presents in both one- and two-year distribution. The standard errors of all ages seem to increase with the levels of spending and become larger at older ages.


Risk adjustment and observation time: comparison between cross-sectional and 2-year panel data from the Medical Expenditure Panel Survey (MEPS).

Chao YS, Wu CJ, Chen TS - Health Inf Sci Syst (2014)

Average health expenditure and the 95% confidence intervals observed in 1- and 2-year periods by age (0 to 85 years).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4340859&req=5

Fig1: Average health expenditure and the 95% confidence intervals observed in 1- and 2-year periods by age (0 to 85 years).
Mentions: Figure 1 (and Additional file1: Table S1) presents the mean health spending of all ages (0 to 85 years) observed in one or two-year periods from 1996 (13 years or 13 2-year panels in total). The spending distribution looks like J-shape. Mean expenditure is high at age zero and then decreases with ages, until 10 years of age. The increase of health spending presents in both one- and two-year distribution. The standard errors of all ages seem to increase with the levels of spending and become larger at older ages.

Bottom Line: The results of this technique were not satisfying.One reason could be that the length of time to document consumption might be associated with the mean and variance of observed health care consumption.The reason is not clear and we will continue studying this phenomenon.

View Article: PubMed Central - PubMed

Affiliation: School of Public Health, University of Alberta, Edmonton, Alberta T6G2T4 Canada.

ABSTRACT

Background: Risk adjustment models were used to estimate health care consumption after adjusting for individual characteristics or other factors. The results of this technique were not satisfying. One reason could be that the length of time to document consumption might be associated with the mean and variance of observed health care consumption. This study aims to use a simplified mathematical model and real-world data to explore the relationship of observation time (one or two years) and predictability.

Methods: This study used cross-sectional (one-year) and 2-year panel data sets of the Medical Expenditure Panel Survey (MEPS) from 1996 to 2008. Comparisons of the health care consumption (total health expenditure, emergency room (ER) and office-based visits) included ratios of means and standard errors (SEs). Risk adjustment models for one- and two-year data used generalized linear model.

Results: The ratios of mean health care consumption (two-year to one-year total expenditure, ER and office-based visits) seemed to be two in most age groups and the ratios of SEs varied around or above two. The R-squared of two-year models seemed to be slightly better than that of one-year models.

Conclusions: We find health expenditure and ER or office-based visits observed in two consecutive years were about twice those observed in a single year for most age, similar to the ratios predicted in mathematical examples. The ratios of mean spending and visits varied across age groups. The other finding is that the predictability of two-year consumption seems better than that of one-year slightly. The reason is not clear and we will continue studying this phenomenon.

No MeSH data available.


Related in: MedlinePlus