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Public Reporting and Pay for Performance in Hospital Quality Improvement

Peter K. Lindenauer, M.D., M.Sc., Denise Remus, Ph.D., R.N., Sheila Roman, M.D., M.P.H., Michael B. Rothberg, M.D., M.P.H., Evan M. Benjamin, M.D., Allen Ma, Ph.D., and Dale W. Bratzler, D.O., M.P.H.

N Engl J Med 2007; 356:486-496February 1, 2007

Abstract

Background

Public reporting and pay for performance are intended to accelerate improvements in hospital care, yet little is known about the benefits of these methods of providing incentives for improving care.

Methods

We measured changes in adherence to 10 individual and 4 composite measures of quality over a period of 2 years at 613 hospitals that voluntarily reported information about the quality of care through a national public-reporting initiative, including 207 facilities that simultaneously participated in a pay-for-performance demonstration project funded by the Centers for Medicare and Medicaid Services; we then compared the pay-for-performance hospitals with the 406 hospitals with public reporting only (control hospitals). We used multivariable modeling to estimate the improvement attributable to financial incentives after adjusting for baseline performance and other hospital characteristics.

Results

As compared with the control group, pay-for-performance hospitals showed greater improvement in all composite measures of quality, including measures of care for heart failure, acute myocardial infarction, and pneumonia and a composite of 10 measures. Baseline performance was inversely associated with improvement; in pay-for-performance hospitals, the improvement in the composite of all 10 measures was 16.1% for hospitals in the lowest quintile of baseline performance and 1.9% for those in the highest quintile (P<0.001). After adjustments were made for differences in baseline performance and other hospital characteristics, pay for performance was associated with improvements ranging from 2.6 to 4.1% over the 2-year period.

Conclusions

Hospitals engaged in both public reporting and pay for performance achieved modestly greater improvements in quality than did hospitals engaged only in public reporting. Additional research is required to determine whether different incentives would stimulate more improvement and whether the benefits of these programs outweigh their costs.

Media in This Article

Figure 1Improvement in Composite Process Measures among Hospitals Engaged in Both Pay for Performance and Public Reporting and Those Engaged Only in Public Reporting.
Table 1Quality Measures Shared by the Hospital Quality Alliance and Hospital Quality Incentive Demonstration.
Article

The need to improve both the quality and the safety of health care in the United States is well documented.1-5 Traditional strategies to stimulate improvement include regulation, measurement of performance and subsequent feedback, and marketplace competition.6 Despite limited evidence, public reporting of hospital quality data and pay for performance have emerged as two of the most widely advocated strategies for accelerating quality improvement.7-11 Public reporting stimulates interest in quality on the part of physicians and hospital leaders, perhaps by appealing to their professional ethos.12 Pay-for-performance programs are intended to strengthen the business case for quality improvement by rewarding excellence and reversing what have been described as perverse financial incentives that can deter hospitals from investing in quality-improvement efforts.9,13,14 In enacting the Deficit Reduction Act of 2005, Congress demonstrated its support for financial incentives by calling on the Centers for Medicare and Medicaid Services (CMS) to develop a plan for hospital “value based purchasing” by 2009.15

Despite the instinctive appeal of pay for performance and public reporting, little is known about the individual or combined benefits of such programs,12,16,17 and both are the subject of ongoing debate.18-23 In order to determine the incremental effect of pay for performance, we measured improvements in hospital quality that occurred when financial incentives were combined with public reporting and compared these improvements with gains associated with public reporting alone.

Methods

Hospital Quality Alliance

In December 2002, the American Hospital Association, the Federation of American Hospitals, and the Association of American Medical Colleges launched the Hospital Quality Alliance (HQA), a national public–private collaboration to encourage hospitals to collect and report data regarding the quality of care on a voluntary basis.24 The HQA was designed to provide information about the quality of hospital care to the public and to “invigorate efforts to improve quality.” All acute care hospitals in the United States were invited to participate, and by linking participation in the program to the annual Medicare payment update, the CMS was able to achieve participation rates of more than 98%. Participating hospitals were required to collect and report data on a minimum of 10 quality measures regarding three clinical conditions: heart failure, acute myocardial infarction, and pneumonia (Table 1Table 1Quality Measures Shared by the Hospital Quality Alliance and Hospital Quality Incentive Demonstration.). Hospitals began submitting data in the fourth quarter of 2003, and this information was made available on the Hospital Compare Web site.25 In order to provide stable rate estimates, data from hospitals that submitted information on fewer than 25 cases each year for a given condition were not reported online.

Hospital Quality Incentive Demonstration

In March 2003, hospitals subscribing to a quality-benchmarking database, known as Perspective, which is maintained by Premier Healthcare Informatics, were invited to participate in the CMS–Premier Hospital Quality Incentive Demonstration (HQID), a multiyear collaborative whose goal was “to determine if economic incentives are effective at improving the quality of inpatient care.”26 Hospitals that accepted the invitation collected and submitted data on 33 quality measures regarding five clinical conditions: heart failure, acute myocardial infarction, community-acquired pneumonia, coronary-artery bypass grafting, and hip and knee replacement. This set of conditions included the previously described 10 measures reported on the Hospital Compare Web site. The remaining 23 measures are described elsewhere.26

Hospitals needed to have a minimum of 30 cases per condition annually to be eligible for the demonstration. For each of the clinical conditions, hospitals performing in the top decile on a composite measure of quality for a given year received a 2% bonus payment in addition to the usual Medicare reimbursement rate. Hospitals in the second decile received a 1% bonus. Bonuses averaged $71,960 per year and ranged from $914 to $847,227. These additional payments are anticipated to be partially offset by financial penalties ranging from 1 to 2% of Medicare payments for hospitals that by the end of the third year of the program had failed to exceed the performance of hospitals in the lowest two deciles, as established during the program's first year.

Of 421 hospitals that were invited to participate, 266 (63%) initially accepted, 155 declined, and 11 later withdrew. In several instances, multiple hospitals shared the same Medicare provider number. These multihospital organizations submit billing claims and clinical quality data to the CMS as a single entity and were treated as a single hospital for the purpose of our analysis. The demonstration project began in the fourth quarter of 2003 and continued through the third quarter of 2006. Informed consent and institutional review board approval were not required because the data were collected for administration of the Medicare program, not for research, and access to these data is provided to the program by law. All the authors assume full responsibility for the accuracy and completeness of the data presented.

Statistical Analysis

The overlapping reporting requirements between the HQA and HQID allowed us to compare improvements in quality associated with public reporting with those achieved when financial incentives are combined with public reporting. Hospitals were eligible for our analysis if they participated in the HQA program and submitted data on a minimum of 30 cases for a single condition annually, including at least 8 cases in both the fourth quarter of 2003 and the third quarter of 2005. In our primary analyses, we matched each HQID participant with as many as two HQA hospitals on the basis of the number of beds (matched to within five beds), teaching status (teaching or nonteaching), region (Northeast, Midwest, South, or West), location (urban or rural), and ownership status (not-for-profit or for-profit). These analyses focused on HQID hospitals that had participated in the program throughout the entire 2-year study period. From the pool of HQA hospitals available for matching, we excluded those that had either declined participation in the HQID or started the demonstration and then withdrew, since these decisions may have reflected doubts about whether the hospitals would be successful or other confounding factors.

We treated the matched sets as the primary units of analysis. We calculated the change in adherence to each of the HQA quality measures over a period of eight quarters for each hospital. We then calculated the difference in the improvement for each HQA quality measure for pay-for-performance hospitals, as compared with the control group. In sets with two control hospitals, the improvements at the two facilities were averaged. A paired t-test was performed to evaluate the difference in improvement between pay-for-performance and control hospitals. In addition, we calculated the percentage change in adherence to two sets of compound measures for each of the clinical conditions. First, we calculated a “composite process score” by adding up the total number of opportunities for each condition for which correct care was provided and dividing this result by the sum of the number of correct care opportunities.27 Using this same approach, we calculated a summary composite score that combined all 10 individual measures. Second, we created an “appropriate care measure” by calculating the percentage of patients who received all recommended interventions for a given clinical condition. As compared with composite process measures, appropriate care measures may better represent the interests and likely desires of patients, are more sensitive to subtle improvements, and can help foster a system perspective in quality measurement.28

We performed a series of stratified analyses to evaluate the effects of baseline performance, teaching status, and number of beds on the response to these incentives and compared the improvement of pay-for-performance hospitals with that of control hospitals. To estimate the incremental effect of financial incentives, multiple linear regression was applied to the matched sample. The dependent variable in these analyses was the difference in improvement between pay-for-performance hospitals and control hospitals for each matched set. We controlled for baseline hospital performance and diagnosis-specific hospital volume. The four composite process measures were used for all stratified and multivariable analyses.

To provide additional validation of our results, we conducted another multiple linear regression using the entire set of HQA participants, not only those identified through matching, with the individual hospital as the unit of analysis. In this regression, the dependent variable was the improvement over the 2-year study period, and we adjusted for baseline hospital performance, diagnosis-specific hospital volume, and all other available hospital characteristics.

To evaluate the potential contribution of a “volunteer bias” among the pay-for-performance group, we repeated our multivariable analysis by grouping hospitals that had either declined participation in the HQID or had withdrawn, together with those that had accepted and had completed the 2 years. Finally, we repeated our multiple linear regression using the entire set of HQA participants, with the hospital as the unit of analysis, and added an interaction term to explore whether the effect of pay for performance varied across quintiles of baseline performance. All analyses were carried out with the use of SAS software, version 9.1 (SAS Institute). P values of less than 0.05 were considered to indicate statistical significance.

Results

Of the 4691 hospitals that submitted data for the HQA between the fourth quarter of 2003 and the third quarter of 2005, 2490 met our enrollment criteria, including 266 participants in the HQID. Eleven hospitals withdrew from the HQID during the first 2 years, leaving 255 pay-for-performance hospitals eligible for our primary analysis. We successfully matched 207 of these 255 HQID hospitals with 406 HQA controls, including 199 with two matches and 8 with one match. The typical hospital included in the study was a small-to-midsize, nonteaching, not-for-profit facility serving an urban population in the South (Table 2Table 2Characteristics of Hospitals Included in the Analysis.). As compared with all hospitals participating in the HQA, study hospitals were larger, less likely to have for-profit ownership, more likely to be urban, and more likely to have house staff. Hospitals that declined participation in the HQID were on average smaller, more rural, and less engaged in house-staff training (see Table 2A of the Supplementary Appendix, available with the full text of this article at www.nejm.org).

Improvements in Quality

Over the 2-year study period, both pay-for-performance hospitals and control hospitals showed evidence of improvement in each of the individual and compound measures of performance (Table 3Table 3Improvements in Quality over a 2-Year Period among Hospitals Engaged in Pay for Performance and Public Reporting. and Figure 1Figure 1Improvement in Composite Process Measures among Hospitals Engaged in Both Pay for Performance and Public Reporting and Those Engaged Only in Public Reporting.). Pay-for-performance hospitals showed significantly greater improvement than did control hospitals in 7 of the 10 individual measures of performance, with absolute differences in improvement ranging from 0.6% for oxygen assessment among patients with pneumonia (P=0.09) to 10.9% for vaccination among patients with pneumonia (P<0.001) (Table 3). Pay-for-performance hospitals also achieved greater improvement in all the composite process measures, with differences ranging from 4.1% for pneumonia (P<0.001) to 5.2% for heart failure (P<0.001). For each of the conditions, differences in the composite measures of performance between the two hospital groups increased throughout the 2-year study period (Figure 1). A similar pattern was observed for the appropriate care measures (i.e., percentages of patients who received all recommended treatments for the condition), with absolute differences in changes ranging from 6.0% for heart failure (P<0.001) to 7.5% for acute myocardial infarction (P<0.001) (Table 3). Hospitals that declined to participate in the pay-for-performance demonstration improved less than did participating hospitals (Table 3A of the Supplementary Appendix).

Stratified analyses showed an inverse relationship between baseline performance and improvement in both groups of hospitals (Table 4Table 4Effect of Baseline Performance on Improvement in Quality among Hospitals Engaged in Pay for Performance and Public Reporting.). This factor influenced comparisons on the basis of hospital size and teaching status (Table 4A of the Supplementary Appendix). The difference in improvement between pay-for-performance hospitals and control hospitals varied with baseline performance, ranging from 1.2% for the composite measure of care for heart failure among hospitals with the highest baseline performance to 9.6% for the same measure among hospitals with the poorest baseline performance (Table 4).

After adjustment for the effects of baseline performance and for differences in baseline performance and condition-specific volumes between pay-for-performance hospitals and control hospitals, the incremental effect of financial incentives decreased to 2.6% for the composite process measure of acute myocardial infarction (P<0.001) and 4.1% for heart failure (P<0.001) (Table 5Table 5Estimates of Incremental Effect of Pay for Performance.). A second multivariable analysis, which included the entire pool of HQA participants (with adjustment for baseline performance, condition-specific volume, and all hospital characteristics), yielded similar findings. A third analysis, intended to account for a volunteer effect by including hospitals that declined to participate in pay for performance, showed a persistent, albeit smaller, effect of financial incentives (Table 5). A final multivariable analysis, which accounted for the effects of baseline performance and other hospital characteristics, showed that the effect of financial incentives varied according to baseline performance for the composite measure of care for heart failure, with the largest improvements observed among hospitals with the poorest baseline performance. In contrast, for the composite measures of acute myocardial infarction and pneumonia and all 10 measures combined, estimates of the improvement attributable to financial incentives were similar, regardless of baseline performance.

Discussion

Public reporting and pay for performance are two of the most important methods that have been proposed to close persistent gaps in the quality and safety of health care. To evaluate whether combining pay for performance with public reporting results in more improvement than public reporting alone, we took advantage of a natural experiment involving several thousand hospitals engaged in a national public-reporting initiative, with more than 200 simultaneously participating in a pay-for-performance demonstration. We found that hospitals that were offered a 1 to 2% bonus for achieving high levels of performance relative to their peers had greater improvements in quality over a 2-year period than did those receiving no financial incentives. After adjustment for differences in baseline performance and other characteristics between the two groups of hospitals, the incremental effect of financial incentives was reduced, amounting to 2.6 to 4.1% over a period of 2 years.

Why are these findings important? Although the effect of the incentives was modest, our results suggest that financial incentives are capable of catalyzing quality-improvement efforts among hospitals already engaged in public reporting. And although the lion's share of bonus payments were made to hospitals with the highest baseline performance, participants across the entire spectrum responded similarly, perhaps equally motivated by the desire to avoid financial penalties.

However, before widespread application of financial incentives is considered, it should be acknowledged that pay for performance is more complex than public reporting in several ways. First, unless new money is infused into the payment system or savings are identified from improvements in quality, the size of any bonuses will need to be balanced by reductions in reimbursements across the entire system or to underperforming hospitals, creating significant concern about the possibility of harm to safety-net institutions.23 Second, complex and politically charged judgments need to be made about fundamental system design. For example, should bonuses be paid to top-performing hospitals, to those with the greatest improvements, or to all those that meet a performance threshold? Third, the costs of administering pay-for-performance programs are likely to be higher than those for public-reporting programs. With these issues in mind, it will be important to determine not simply whether the addition of pay for performance results in more improvement than public reporting alone, but whether the benefits of such a program are worth the added cost and complexity.

Little is known about the effect of public reporting on the quality of care. In one well-documented case, rates of death after coronary bypass surgery in New York State were observed to fall after hospital-specific rates became public,10 but the mechanisms through which this occurred have been debated. Similarly, according to a report on the QualityCounts program, run by the Employer Health Care Alliance Cooperative, hospitals with public-reporting programs engaged in more quality-improvement activities29 and were more likely to have improved outcomes than were controls.11

Even less is known about the effect of pay for performance on quality or outcomes. In a recent analysis, Rosenthal et al.30 showed that offering financial incentives to physician groups produced little gains in measures of the quality of ambulatory care and largely rewarded groups with high performance at baseline.

Our study has a number of limitations. First, it is unclear how either pay for performance or public reporting alone would have compared with no reporting, and previous studies have noted improvements over time associated with other quality-improvement efforts.31,32 Second, hospitals that were involved in the pay-for-performance demonstration differed from the entire pool of HQA applicants, and our findings should be generalized with caution. Third, baseline performance for 5 of the 10 measures approached or exceeded 90%, thereby limiting our power to detect differences between the two groups. Fourth, although the HQID involved 33 measures spread across 5 conditions and procedures, we assessed the effect of financial incentives only on the 10 conditions that were shared by the HQA. Fifth, our attempt to adjust for volunteer bias may have underestimated the true effect of pay for performance. Sixth, the financial incentives offered to hospitals were modest, and larger bonuses might have led to more sizable improvements in quality. Finally, only the top 20% of participants were eligible for financial rewards, and interest in the program might decline over time, especially among hospitals that consistently fail to garner bonus payments. A choice to use alternative strategies, such as incentives for threshold achievement or absolute or relative improvement, might have led to different outcomes.

In conclusion, financial incentives can modestly increase improvements in quality among hospitals already engaged in public reporting. Additional research is required to determine whether larger incentives or the restructuring of payment models can stimulate more meaningful improvements and to evaluate whether the benefits of these programs outweigh their costs.

Supported by a contract (500-02-OK-03) from the CMS.

The views expressed in this article are those of the authors and do not necessarily reflect the views or policies of the Department of Health and Human Services.

No potential conflict of interest relevant to this article was reported.

We thank Robert Wachter, M.D., for his thoughtful comments on an earlier version of the manuscript, and Penelope Pekow, Ph.D., for her guidance with biostatistics.

Source Information

From the Division of Healthcare Quality, Baystate Medical Center, Springfield, MA (P.K.L., M.B.R., E.M.B.); the Department of Medicine, Tufts University School of Medicine, Boston (P.K.L., M.B.R., E.M.B.); Premier Healthcare Informatics, Premier, Charlotte, NC (D.R.); the Centers for Medicare and Medicaid Services, Baltimore (S.R.); and the Oklahoma Foundation for Medical Quality, Oklahoma City (A.M., D.W.B.).

Address reprint requests to Dr. Lindenauer at the Division of Healthcare Quality, Baystate Medical Center, 759 Chestnut St., P-5931, Springfield, MA 01199, or at .

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