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The American Journal of Managed Care October 2016
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Benchmarking Health-Related Quality-of-Life Data From a Clinical Setting
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Benchmarking Health-Related Quality-of-Life Data From a Clinical Setting

Janel Hanmer, MD, PhD; Rachel Hess, MD, MS; Sarah Sullivan, BS; Lan Yu, PhD; Winifred Teuteberg, MD; Jeffrey Teuteberg, MD; and Dio Kavalieratos, PhD
Health-related quality-of-life data are often collected during routine clinical care. We present a method to create nationally representative benchmarks for clinical subspecialties.
ABSTRACT

Objectives: Health-related quality of life (HRQoL) is an important clinical outcome, yet there is little guidance for its interpretation in clinical settings. One approach would use benchmarking to contextualize HRQoL results. Our objective was to construct a nationally representative HRQoL benchmark for use with a clinical sample.

Study Design: Cross-sectional analysis of HRQoL scores from: 1) the 2011 Medical Expenditures Panel Survey (MEPS), a representative sample of the noninstitutionalized US population; and 2) outpatient academic and community cardiology clinics within a large health system in 2012 and 2013.

Methods: The 2011 MEPS includes 21,959 adults who completed the HRQoL measures; 414 reported visiting a cardiologist. Of 1945 outpatient index visits during the study period that were not for outpatient cardiac catheterization, 1434 patients completed the HRQoL measures. The primary outcome was the Short Form 6-Dimension questionnaire (SF-6D). The secondary outcomes were the Mental Component Summary score and the Physical Component Summary score. 

Results: The local cardiology clinic sample was 42% female with a mean Charlson Comorbidity Index (CCI) score of 1.74. The MEPS subsample of cardiology patients more closely matched the local cardiology clinic sample (43% female; mean CCI score of 1.57) than the entire MEPS sample (52% female; mean CCI score of 0.62). SF-6D scores for the local cardiology clinic sample were significantly better, statistically and clinically, in 4 of 5 age strata than the MEPS subsample of cardiology patients. 

Conclusions: HRQoL benchmarks can be created from current public datasets. Subgroups in national samples may provide more valid benchmarks for clinical populations.

Am J Manag Care. 2016;22(10):669-675
Take-Away Points

Health-related quality of life (HRQoL) data is often collected during routine clinical care; however, there is limited guidance in interpreting the HRQoL results for a clinical practice. This article presents a method to construct a benchmark for subspecialty care clinics from a nationally representative dataset.
  • Creating HRQoL benchmarks for subspecialty clinics is possible.
  • HRQoL benchmarks create a point-of-comparison for local subspecialty clinics.
  • Differences from benchmarks may inform local quality improvement projects.
Healthcare in the United States is evaluated by a wide variety of organizations and measures, which often include conventional health indicators (eg, mortality rates, complication rates, health service use) and measures of patient satisfaction. These measures are important, but do not include one of the ultimate goals of healthcare: health-related quality of life (HRQoL).1 Conventional health indicators are frequently used instead of HRQoL measures because they are more easily quantified, and there are often comparative data available for interpretation of the results.2 As the field of HRQoL measurement has improved, there is increasing interest in including patient-reported outcomes (PROs), such as HRQoL, as an outcome of clinical care.3-5

HRQoL measures are either disease-specific or generic. Disease-specific measures provide a high level of detail about disease-specific symptoms and experiences; conversely, generic measures allow for comparison across disease groups.6 These generic HRQoL measures can broadly be categorized into 2 groups: health status measures and health preference measures. Health status measures (or profile measures) provide a description of multiple domains of health, such as physical functioning, mental health, and pain.7 These measures provide multiple scores—1 for each domain of health measured. In contrast, health preference measures can combine multiple domains into a single score, commonly referred to as a “utility score.” This score is constructed using preferences of different descriptions of health elicited from the general population.8

Generic HRQoL measures provide a unique opportunity to compare outcomes across clinical practices. Unfortunately, these measures are not collected and published routinely enough for comparisons across clinics, health systems, or regions. However, many of these generic measures have been included in large, nationally representative datasets, providing a rich resource for comparisons across smaller population and patient groups.6,9-11 Catalogs of age and sex normative values for generic HRQoL measures6,9,10 have also been published from these datasets, but the values from these catalogs do not address specific patient groups.

Comparing HRQoL results from a clinical sample to HRQoL outcomes for the general population is of limited value because we assume that a clinical sample has more health conditions and worse scores than the general population. Clinicians often worry about the interpretation of any outcome measure because of differing case mixes across clinicians and practices.12 Those who collect clinical HRQoL data would benefit from a point of comparison or benchmark13 for HRQoL results. Benchmarks exist for a wide variety of other clinical outcomes, ranging from physiological markers (eg, glycated hemoglobin and blood pressure control in patients with diabetes) to patient experience (eg, pain control measures, quietness of the hospital environment) to guideline adherence (eg, coronary artery disease, heart failure, atrial fibrillation).14,15

In this report, we construct a HRQoL benchmark for a clinical subspecialty using a nationally representative dataset called the Medical Expenditures Panel Survey (MEPS). MEPS includes HRQoL measures, which allow for the construction of overall population scores.9 The MEPS dataset also includes information about which subspecialists the respondents have seen in the past year, allowing for the construction of subspecialty-specific HRQoL scores. Cardiology is the clinical subspecialty illustrated in this report; however, the technique we present herein can be used with other subspecialties included in MEPS. We compared the national cardiology benchmark to data collected in cardiology clinics from a large health system.

METHODS

Data: National Sample

MEPS is a nationally representative survey of healthcare utilization and expenditures for the US noninstitutionalized civilian population. It is a 2-year panel survey with an overlapping cohort design; each year, a new cohort is initiated and followed longitudinally. Cross-sectional analyses combine information from 2 MEPS cohorts. MEPS data, including the scores analyzed in this report, are freely available online through the Agency for Healthcare Research and Quality (AHRQ) website. We used the most recently released MEPS data for 2011.16

MEPS includes a self-administered questionnaire, which is distributed to all adults 18 years or older in eligible households participating in MEPS. The 2011 MEPS included version 2 of the 12-Item Short Form Health Survey (SF-12v2), a generic HRQoL measure that is widely used in clinical practice and research.17 We analyzed both the entire MEPS sample (referred to hereafter as “All MEPS”) and the subset of patients who reported seeing a cardiologist in 2011 (referred to hereafter as “Cardiology MEPS”). 

Data: Clinical Sample

All patients presenting to any outpatient cardiology practice within our large academic and community health system were asked to complete a survey, including version 1 of the 36-Item Short Form Survey (SF-36v1), a generic HRQoL measure,18 through the Patient-Reported Information Clinical Intake System (PRIcis). PRIcis is an institutional initiative to electronically collect PROs using a secure patient portal or tablet computers in the clinic. These PROs are securely transmitted to and stored within our electronic health record (EHR) system for use in clinical care. Data used in this analysis were collected from March 2012 to April 2013. We included information from a patient’s first visit to a cardiology clinic within this time period; we excluded all other visits and all visits for outpatient heart catheterization. PRIcis was linked to the EHR for demographic and comorbidity information. These data are hereafter referred to as “Cardiology Local.”

Outcome Variables

The primary outcome of interest was the Short Form 6-Dimension questionnaire (SF-6D) health preference score.19 This score can be calculated from both the SF-12v2 in MEPS and the SF-36v1 from PRIcis. The questions in these measures were used to construct health scenarios that were evaluated using the standard gamble20 technique in a representative sample of the UK population. Regression analysis was then used to model the preferences assigned to each health state. With the resulting scoring algorithm, a preference-based score can be assigned to each health state with “dead” anchored at 0 and “full health” anchored at 1.0. This scoring algorithm is published in the peer-reviewed literature.19

Secondary outcomes of interest were the Mental Component Summary (MCS) score and Physical Component Summary (PCS) score. The MCS and PCS were developed from a reduction of the 8 dimensions in the SF-36 (physical functioning, physical role limitations, emotional role limitations, pain, general health, vitality, social functioning, and mental health) to 2 dimensions by factor analysis. The SF-12 is an abridged version of the SF-36, which was constructed so that MCS and PCS scores from either form would be equivalent.21,22

The MCS and PCS scores calculated from the SF-36v1 were based on 1990 US normative data using the publicly available scoring algorithms for version 1.23,24 Scores calculated from the SF-12v2 were based on 1998 US normative data held by QualityMetric, Inc,22 which is now part of Optum (Eden Prairie, Minnesota). The MCS and PCS scores were normalized so that both have averages of 50 and standard deviations of 10. We applied the standard correction to compare across the different versions,22 and we used imputed scores in our analyses—which are freely available in the MEPS dataset—calculated by applying a proprietary algorithm of, what was then, QualityMetric, Inc.

Independent Variables

Both datasets included age in years, sex, and race. Race categories were collapsed into white, black, other, and unspecified to be consistent across the datasets. We calculated a Charlson Comorbidity Index (CCI) score constructed for administrative data,25 which uses International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes. We included ICD-9-CM codes entered in the EHR in the problem list or medical history before, or within 1 week, of the cardiology clinic visit. ICD-9-CM codes are included in MEPS if the individual had a condition linked to a 2011 event (eg, physician visit or taking medication) or disability day, or if the individual was, at that time, experiencing a condition as part of the MEPS condition enumeration assessment.

Statistical Analyses

We used Welch’s 2-tailed t test with unequal variances to compare the mean for SF-6D, MCS, and PCS scores by age strata (18-44, 45-54, 55-64, 65-74, ≥75 years). MEPS results were weighted to be nationally representative in these comparisons. We used the unweighted number of respondents from MEPS for conservatism in the statistical testing. 

As a sensitivity analysis to address different demographic compositions in the clinical and MEPS samples, we created a dataset that combined our clinical data with the MEPS cardiology subsample into a single dataset. We stratified by age group and used ordinary least squares regression with the outcome of interest (SF-6D, MCS, or PCS scores) on sex, number of comorbidities, and clinical versus national sample. These results were unweighted. 

Statistical analyses were performed using SAS version 9.3 (SAS Institute, Cary, North Carolina). We considered P <.05 to be statistically significant. The clinically important difference, defined as “the smallest difference in score in the domain of interest which patients perceive as beneficial,”26 for the SF-6D is 0.04,27 and 5 for the MCS and PCS scores.

The University of Pittsburgh Institutional Review Board approved this study (#PRO 13060301).

RESULTS

Response Rates

Within the 2011 MEPS sample, the response rate of individuals invited to complete the self-administered questionnaire was 93%. There were 21,959 respondents with SF-6D scores in All MEPS and 414 respondents with SF-6D scores in Cardiology MEPS. During the study period, 1945 patients were eligible to complete the PRIcis intake at their first visit. Of these, 1514 (78%) participated and 1434 (95%) completed the SF-6D. The response rate was consistent across age and sex groups, except for those 75 years or older, for whom the total response rate was 65%.

Demographics

 
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