@article {8551, title = {Does the Relationship of the Proxy to the Target Person Affect the Concordance between Survey Reports and Medicare Claims Measures of Health Services Use?}, journal = {Health Serv Res}, volume = {51}, year = {2016}, month = {2016 Feb}, pages = {314-27}, abstract = {

OBJECTIVES: To compare concordance of survey reports of health service use versus claims data between self respondents and spousal and nonspousal relative proxies.

DATA SOURCES: 1995-2010 data from the Survey on Assets and Health Dynamics among the Oldest Old and 1993-2010 Medicare claims for 3,229 individuals (13,488 person-years).

STUDY DESIGN: Regression models with individual fixed effects were estimated for discordance of any hospitalizations and outpatient surgery and for the numbers of under- and over-reported physician visits.

PRINCIPAL FINDINGS: Spousal proxies were similar to self respondents on discordance. Nonspousal proxies, particularly daughters/daughters-in-law and sons/sons-in-law, had less discordance, mainly due to reduced under-reporting.

CONCLUSIONS: Survey reports of health services use from nonspousal relatives are more consistent with Medicare claims than spousal proxies and self respondents.

}, keywords = {Ambulatory Surgical Procedures, Female, Hospitalization, Humans, Insurance Claim Review, Male, Medicare, Patient Acceptance of Health Care, Proxy, Self Report, Socioeconomic factors, Spouses, United States}, issn = {1475-6773}, doi = {10.1111/1475-6773.12321}, url = {https://www.ncbi.nlm.nih.gov/pubmed/26059195}, author = {George L Wehby and Michael P Jones and Fred A Ullrich and Yiyue Lou and Frederic D Wolinsky} } @article {7526, title = {Defining emergency department episodes by severity and intensity: A 15-year study of Medicare beneficiaries.}, journal = {BMC Health Serv Res}, volume = {10}, year = {2010}, month = {2010 Jun 21}, pages = {173}, publisher = {8}, abstract = {

BACKGROUND: Episodes of Emergency Department (ED) service use among older adults previously have not been constructed, or evaluated as multi-dimensional phenomena. In this study, we constructed episodes of ED service use among a cohort of older adults over a 15-year observation period, measured the episodes by severity and intensity, and compared these measures in predicting subsequent hospitalization.

METHODS: We conducted a secondary analysis of the prospective cohort study entitled the Survey on Assets and Health Dynamics among the Oldest Old (AHEAD). Baseline (1993) data on 5,511 self-respondents >or=70 years old were linked to their Medicare claims for 1991-2005. Claims then were organized into episodes of ED care according to Medicare guidelines. The severity of ED episodes was measured with a modified-NYU algorithm using ICD9-CM diagnoses, and the intensity of the episodes was measured using CPT codes. Measures were evaluated against subsequent hospitalization to estimate comparative predictive validity.

RESULTS: Over 15 years, three-fourths (4,171) of the 5,511 AHEAD participants had at least 1 ED episode, with a mean of 4.5 episodes. Cross-classification indicated the modified-NYU severity measure and the CPT-based intensity measure captured different aspects of ED episodes (kappa = 0.18). While both measures were significant independent predictors of hospital admission from ED episodes, the CPT measure had substantially higher predictive validity than the modified-NYU measure (AORs 5.70 vs. 3.31; p < .001).

CONCLUSIONS: We demonstrated an innovative approach for how claims data can be used to construct episodes of ED care among a sample of older adults. We also determined that the modified-NYU measure of severity and the CPT measure of intensity tap different aspects of ED episodes, and that both measures were predictive of subsequent hospitalization.

}, keywords = {Aged, Aged, 80 and over, Cohort Studies, Emergency Service, Hospital, Humans, Insurance Claim Review, Medicare, Prospective Studies, Severity of Illness Index, United States}, issn = {1472-6963}, doi = {10.1186/1472-6963-10-173}, author = {Kaskie, Brian and Maksym Obrizan and Elizabeth A Cook and Michael P Jones and Li Liu and Suzanne E Bentler and Robert B Wallace and John F Geweke and Kara B Wright and Elizabeth A Chrischilles and Claire E Pavlik and Robert L. Ohsfeldt and Gary E Rosenthal and Frederic D Wolinsky} } @article {7177, title = {Does more health care improve health among older adults? A longitudinal analysis.}, journal = {J Aging Health}, volume = {19}, year = {2007}, month = {2007 Dec}, pages = {888-906}, publisher = {19}, abstract = {

OBJECTIVE: This research assesses the association of health services use with subsequent physical health among older Americans, adjusting for the confounding between health care use and prior health.

METHOD: Longitudinal data are from the Survey on Assets and Health Dynamics Among the Oldest Old (AHEAD). Linear and logistic regressions are used to model the linkages between medical care use and health outcomes, including self-rated health, functional limitations, and mortality.

RESULTS: There is limited evidence that increased health care use is correlated with improved subsequent health. Increased use of medical care is largely associated with poorer health outcomes. Moreover, there are no significant interaction effects of health care use and baseline health on Activities of Daily Living and Instrumental Activities of Daily Living, despite the existence of a significant but very small interaction effect on self-rated health.

CONCLUSIONS: The findings have implications for the quality of care delivered by the American health care system.

}, keywords = {Activities of Daily Living, Aged, Health Services, Health Services for the Aged, Health Status, Humans, Longitudinal Studies, United States}, issn = {0898-2643}, doi = {10.1177/0898264307308338}, author = {Ezra Golberstein and Jersey Liang and A. R. Quinones and Frederic D Wolinsky} } @article {7116, title = {Dual use of Medicare and the Veterans Health Administration: are there adverse health outcomes?}, journal = {BMC Health Serv Res}, volume = {6}, year = {2006}, month = {2006 Oct 09}, pages = {131}, publisher = {6}, abstract = {

BACKGROUND: Millions of veterans are eligible to use the Veterans Health Administration (VHA) and Medicare because of their military service and age. This article examines whether an indirect measure of dual use based on inpatient services is associated with increased mortality risk.

METHODS: Data on 1,566 self-responding men (weighted N = 1,522) from the Survey of Assets and Health Dynamics among the Oldest Old (AHEAD) were linked to Medicare claims and the National Death Index. Dual use was indirectly indicated when the self-reported number of hospital episodes in the 12 months prior to baseline was greater than that observed in the Medicare claims. The independent association of dual use with mortality was estimated using proportional hazards regression.

RESULTS: 96 (11\%) of the veterans were classified as dual users. 766 men (50.3\%) had died by December 31, 2002, including 64.9\% of the dual users and 49.3\% of all others, for an attributable mortality risk of 15.6\% (p < .003). Adjusting for demographics, socioeconomics, comorbidity, hospitalization status, and selection bias at baseline, as well as subsequent hospitalization for ambulatory care sensitive conditions, the independent effect of dual use was a 56.1\% increased relative risk of mortality (AHR = 1.561; p = .009).

CONCLUSION: An indirect measure of veterans{\textquoteright} dual use of the VHA and Medicare systems, based on inpatient services, was associated with an increased risk of death. Further examination of dual use, especially in the outpatient setting, is needed, because dual inpatient and dual outpatient use may be different phenomena.

}, keywords = {Aged, Aged, 80 and over, Deductibles and Coinsurance, Episode of Care, Health Services Research, Hospitals, Veterans, Humans, Male, Medicare, Mortality, Outcome Assessment, Health Care, Proportional Hazards Models, Quality Indicators, Health Care, Risk Assessment, Selection Bias, Surveys and Questionnaires, United States, United States Department of Veterans Affairs, Veterans}, issn = {1472-6963}, doi = {10.1186/1472-6963-6-131}, author = {Frederic D Wolinsky and Thomas R Miller and An, Hyonggin and Paul R Brezinski and Thomas E Vaughn and Gary E Rosenthal} }