Vivian Yaling Wu

Learn More
  • Vivian Y. Wu
  • International Journal of Health Care Finance and…
  • 2009
This paper analyzes hospital cost shifting using a natural experiment generated by the Balanced Budget Act (BBA) of 1997. I find evidence that urban hospitals were able to shift part of the burden of Medicare payment reduction onto private payers. However, the overall estimated degree of cost shifting is small and varies according to a hospital’s share of(More)
OBJECTIVE To estimate the effects of changes in Medicare inpatient hospital prices on hospitals' overall revenues, operating expenses, profits, assets, and staffing. PRIMARY DATA SOURCE Medicare hospital cost reports (1996-2009). STUDY DESIGN For each hospital, we quantify the year-to-year price impacts from changes in the Medicare payment formula. We(More)
OBJECTIVE Analyze trends in hospital cost and revenue, as well as price and quantity (1994-2005) as a function of health maintenance organization (HMO) penetration, HMO concentration, and for-profit (FP) HMO market share. DATA Medicare hospital cost reports, AHA Annual Surveys, HMO data from Interstudy, and other supplemental data. STUDY DESIGN A(More)
Research has shown that managed care (MC) slowed the rate of growth in health care spending in the 1990s, primarily via lower unit prices paid. However, the mechanism of MC's price bargaining has not been well studied. This article uses a unique panel dataset with actual hospital prices in Massachusetts between 1994 and 2000 to examine the sources of MC's(More)
The long-term trend of consolidation among US health plans has raised providers' concerns that the concentration of health plan markets can depress their prices. Although our study confirmed that, it also revealed a more complex picture. First, we found that 64 percent of hospitals operate in markets where health plans are not very concentrated, and only 7(More)
OBJECTIVE To examine the long-term impact of Medicare payment reductions on patient outcomes for Medicare acute myocardial infarction (AMI) patients. DATA SOURCES Analysis of secondary data compiled from 100 percent Medicare Provider Analysis and Review between 1995 and 2005, Medicare hospital cost reports, Inpatient Prospective Payment System Payment(More)
The association between schizophrenia and cancer risk is contentious in the clinical and epidemiological literature. Studies from different populations, tumor sites, or health care systems have provided inconsistent findings. In the present study, we examined a less well-investigated hypothesis that age plays a crucial role in cancer risk in schizophrenia.(More)
OBJECTIVE Previous studies suggested that antidepressants augmented with second-generation antipsychotics (SGAs), including aripiprazole, olanzapine, quetiapine, and risperidone, resulted in better treatment response or higher rates of remission in patients with major depressive disorder (MDD). However, population-based study on SGA augmentation for(More)
OBJECTIVE To follow the evolution of the breastfeeding practice among women in a childbirth clinic and evaluate the actions for its promotion. METHODS Two cohorts of children born in an school hospital of Porto Alegre, Brazil, in different periods of time were compared regarding the prevalence of breastfeeding during the first six months of life, and the(More)
  • Vivian Y Wu
  • Inquiry : a journal of medical care organization…
  • 2008
This paper analyzes the anti-competitive effect of hospital closures between 1993 and 1998. Using a modified rival analysis with difference-in-differences (DD) and difference-in-difference-in-differences (DDD) identification strategies, this study finds that competitors located nearest to closed hospitals were best able to improve their bargaining position.(More)