Calculating a social score is feasible and it predicts cardiovascular outcomes. In order to do this, institutions have to collect social determinants of health.
Objectives: Cardiovascular disease (CVD) continues to disproportionately affect disadvantaged populations, leading to calls to address social determinants of health (SDOH) as a preventive strategy. Our aim is to create a weighed SDOH score and to test the impact of each SDOH factor on the Framingham risk score (FRS) and on individual traditional CVD risk factors.
Study Design: We conducted a retrospective cohort study.
Methods: We included patients seen at a primary care clinic at UHealth/University of Miami Health System who answered a SDOH survey between September 16, 2016, and September 10, 2017. The survey included SDOH domains recommended by the American Heart Association position statement and by the National Academy of Medicine. We selected the FRS as well as all traditional CVD risk factors as our outcome metrics.
Results: We included 2876 patients. The mean (SD) age of our cohort was 53.8 (15.8) years, 61% were female, 9% were Black, 38% were Hispanic, and 87% reported speaking English. The statistically significant β coefficients in the FRS model corresponded to being born outside of the United States, being a racial minority, living alone, having a high social isolation score, and having a low geocoded median household income (P < .01). Increasing quartile of SDOH score was significantly associated with higher systolic blood pressure, FRS, glycated hemoglobin, and smoking pack-years (P < .05). It was also associated with fewer minutes spent exercising weekly (P < .01).
Conclusions: The addition of self-reported SDOH data has a dose effect on CVD risk factors. Future studies should address how to intervene to address social factors.
Am J Manag Care. 2020;26(10):e312-e318. https://doi.org/10.37765/ajmc.2020.88504
Social risks predict outcomes in many conditions; because of this, institutions are moving to collect social determinants. A social score, created by clinicians, can help them in clinical practice. In this paper, we demonstrate the following:
Cardiovascular disease (CVD) continues to be the leading cause of death in the United States and disproportionally affects disadvantaged groups.1-6 Cited reasons for CVD disparities have included a higher prevalence of CVD risk factors and underutilization of evidence-based treatments and preventive strategies.5,7
Over the past few years, a large body of evidence has reported that social determinants of health (SDOH)8 are associated with health behaviors, CVD outcomes, and life expectancy.9-15 Populations in disadvantaged socioeconomic positions are more likely to have adverse CVD outcomes compared with wealthier populations who may be benefiting from current preventive and curative strategies.15-19
For these reasons, several professional medical organizations have endorsed the need for health systems to screen for20 and address SDOH3,21-24 to improve outcomes. The SDOH commonly cited include key social domains such as socioeconomic position (income and education), race and ethnicity, food insecurity, language, culture, social support, access to care, stress, and residential environment.3 The National Academy of Medicine (NAM) recommended a list of validated SDOH questions addressing these domains to be included in electronic health records (EHRs),and HHS made addressing SDOH a pivotal aspect in the transition toward value-based care.25,26 However, despite the significant momentum for addressing SDOH,27 there is little evidence on effective strategies using SDOH data at the health system level.19,28 Key knowledge gaps have limited the use of SDOH for predicting risk. Among these gaps are the limited number of studies with the necessary upstream diverse SDOH data to conduct multivariate analysis,7 the limited understanding of the net contribution of specific SDOH as risk or protective factors for particular conditions,27 and the lack of evidence on SDOH measuring tools that can effectively risk-stratify and identify individuals at higher risk.
Therefore, the aim of our study was 2-fold: (1) to integrate SDOH and EHR data from a large academic center to evaluate the net contribution of each SDOH factor on the 10-year Framingham risk score (FRS) for CVD, taking into account potential collinearity of SDOH; and (2) to use the weighted contribution of each SDOH to develop a social risk score and to test its correlation to traditional modifiable CVD risk factors such as blood pressure, dyslipidemia, obesity, diabetes control, smoking, and physical activity.
Study Design and Study Setting
We conducted a retrospective cohort study of all patients 18 years and older who were seen at a primary care clinic at UHealth/University of Miami Health System and answered a SDOH survey between September 16, 2016, and September 10, 2017. We collected information on this population from the time of the survey to November 30, 2017. We collected outcome metrics from the EHR during this time period, with a mean (SD) follow-up of 10 (5) months.
Patients with upcoming appointments received a message via their preferred form of contact (text or email) asking them to use the provided link to their patient portal, MyUHealthChart, to access and complete a 15-item SDOH survey.
We used EHR data to collect baseline demographics including race/ethnicity, comorbidities (at the time of the survey), and our selected outcome metrics during the follow-up period. UHealth collects self-reported race/ethnicity using the 2 Census-based questions for race and Hispanic/Latino origin. We collected comorbidities such as hypertension, diabetes, dyslipidemia, coronary artery disease, and stroke present at the time of the survey in either the EHR problem list or the corresponding International Classification of Diseases codes in the encounter forms. We collected Census-based block-level information on the median household income using the patient’s address and linking the EHR with the 2010 Census.29 We collected data on our outcome metrics from the date an individual responded to the survey up to the end of the study period.
Our survey included previously validated questions and was based on the survey proposed by the NAM’s Committee on the Recommended Social and Behavioral Domains and Measures for Electronic Health Records.3,23,24,30 We chose this survey due to the documented validity of the questions and their relationship with health outcomes (eAppendix [eAppendices available at ajmc.com]).31,32 Based on insights from our local South Florida population, we decided to add to the NAM survey 2 questions that have also been previously validated. These questions screen for known correlates of CVD risk factors and disparities, such as a patient’s overall health literacy status33 and delay seeking health care.34 The survey also included a social isolation score.35 As recommended by the American Heart Association (AHA) and NAM, we also included geocoded residential addresses24 in order to ascertain community and neighborhood characteristics. The questionnaire and analysis method are available in eAppendix A.
Exposure to Social Risk: SDOH Score
We defined SDOH exposure as a weighted score. We calculated the score using the SDOH variables collected for each individual (eAppendix). To derive the weighted SDOH score, we used linear regression and confirmatory factor analysis (CFA) and estimated the coefficients of change of contributory variables on the FRS (dependent variable). For each of the 2 methods, we multiplied the resulting coefficients by each SDOH variable shown in Table 1 (0, SDOH absent, and 1, SDOH present) and then added the results to create the weighted score.
Our outcomes measures were (1) the 10-year FRS for CVD (FRS-CVD) and (2) modifiable CVD risk factors available in the EHR.36 Traditional modifiable CVD risk factors included blood pressure, low-density lipoprotein (LDL) cholesterol, body mass index (BMI), physical activity, tobacco use, and stress, as well as glycated hemoglobin (A1C) for those with diabetes. We collected all measures of blood pressure, A1C, LDL cholesterol, and BMI available in the EHR during the study period and reported the last value available for each CVD risk factor. We collected the information on tobacco use from the EHR and physical activity from the SDOH survey at baseline. We collected all the variables needed to calculate the FRS-CVD during the study period. These include age, gender, total cholesterol, high-density lipoprotein cholesterol, smoking status, history of diabetes, systolic blood pressure, and use of medications for hypertension. We used the latest set of values for the FRS-CVD calculation and reported the mean FRS-CVD of the cohort. We also categorized patients as having a low FRS-CVD if they had a score of less than 10; a moderate score, 10 to 20; and a high score, greater than 20.36 The rationale for using the FRS-CVD score is that it is a reliable and validated way of evaluating future cardiovascular risk and is used broadly by clinicians. We captured all systolic and diastolic blood pressure measures during the study period and reported mean blood pressure for all patients participating in the study. We classified blood pressure as not being controlled if it was higher than 140/90 mm Hg.37,38 We captured all A1C values during the study period and reported the mean A1C only for patients with a diagnosis of diabetes at baseline. We used the American Diabetes Association (ADA) A1C cutoff point of greater than 7% to categorize patients as not having met their A1C target.39 We captured all LDL cholesterol values during the study period and used the mean LDL cholesterol for all participants. We categorized patients with diabetes as having met their target LDL cholesterol level if they achieved a goal of 100 mg/dL or less, according to ADA standards.40,41 We used the last weight value available during the study period to calculate BMI for each patient. We categorized subjects as overweight if their BMI was 25 to 29.9 and obese if their BMI was 30 or higher.42 From the EHR, we collected information regarding current smoker status, self-reported pack-year history, and achievement of smoking cessation.43 We captured self-reported physical activity via the SDOH survey at baseline. We captured if subjects exercised, how many times a week they exercised, and for how many minutes each time.44 As recommended by AHA, we multiplied the number of times people exercised by the number of minutes each time to obtain the total exercise minutes per week.45
We conducted 2 complementary analyses to accomplish the aims of our study. First, we used CFA to evaluate the effect of each variable on the FRS and to evaluate collinearity among the SDOH variables. Variables that were correlated to one another and contributed together to the FRS were considered a latent variable or a domain.46 To compare the goodness of fit, we used the root mean square error of approximation and comparative fit index. We compared 2 models to represent the best fit for the overall data. Model 1 was a 1-factor model that used each of the nondichotomized SDOH variables. Model 2 was a 2-factor model with financial strain, education, and social isolation as latent factors.
Second, we constructed a weighted SDOH score using the coefficients derived from the CFA (eAppendix B). Combining the CFA results to create a score has been previously described.47 We then multiplied the β coefficient by each SDOH variable (0, SDOH absent, and 1, SDOH present), then added the results to create the weighted score. To calibrate the model, we used the Hosmer-Lemeshow statistic and calculated the observed and expected observations and model fit. We excluded observations when data were missing and did not impute the SDOH results.
As a sensitivity analysis, to test the effect of a SDOH score on CVD risk using a robust methodological approach, we also used linear regression to determine the net contribution of each SDOH. We used the linear regression coefficients to create a SDOH score using the same approach described previously for the CFA-based score (eAppendix C).
Analyses were performed using Stata 14.0 (StataCorp), and all significance tests were 2-tailed.
A total of 7883 patients were enrolled in our primary care clinics at the time the survey was deployed. The comparison of basic demographics of the responders and nonresponders are shown in the eAppendix. A total of 2876 patients attending primary care visits responded to the SDOH survey during the study period (response rate, 36%). We had complete data for only 2229 patients. The mean (SD) age of our cohort was 53.8 (15.8) years, 61% were female, 9% were Black, 38% were Hispanic, and 87% reported speaking English. The median (interquartile range) household income of the cohort was $53,677 ($42,813-$67,760). The prevalence of each SDOH characteristic in the entire cohort is depicted in Table 1. Thirty-three percent of survey respondents said that they had a hard time paying for basics, 31% delayed care, and 36% were socially isolated.
When evaluating the distribution of all baseline characteristics by quartile of SDOH score, we found that an increasing SDOH score correlated with being a member of a racial/ethnic minority group, not being employed, having an education of high school or less, residing in a community with lower household income according to Census data, and having a higher prevalence of baseline CVD risk factors (P < .01) (Table 2).
Net Contribution of SDOH to the 10-Year FRS-CVD
Our CFA showed that several variables correlated with one another and were highly associated with the FRS-CVD. The latent variables were financial strain (income, difficulty paying for basics, and delaying care), which had the highest association with the FRS-CVD (0.87), followed by education (literacy and schooling) (0.72) and social isolation (0.68) (eAppendix C Figure 1).
Relationship Between the Weighted SDOH Score
and Modifiable CVD Risk Factors
The linear regression model of the CFA coefficients generated a weighted SDOH score that ranged from 8 to 22. Univariate linear regression models showed that as the quartiles of SDOH increased, the mean values of blood pressure, A1C, and smoking pack-years increased (P < .01); BMI tended to increase (P = .05); and minutes of physical activity decreased (P < .01) (Table 3).
Nevertheless, in a multivariate linear regression model adjusted for age, gender, race, and ethnicity, increasing SDOH score was independently associated with increases in FRS, systolic blood pressure, A1C, BMI, and smoking pack-years and with a decrease in physical activity (Table 4).
Impact of Increasing SDOH Score on Clinical Benchmarks of CVD Risk Factor Control
Our logistic regression models on the impact of increasing SDOH score on different clinical benchmarks of CVD risk factor control (Table 5) showed that as SDOH score increased there were statistically significant odds of not meeting the established benchmarks of blood pressure less than 140/90 mm Hg, A1C less than 7%, physical activity of more than 150 minutes per week, and not smoking. There was a clear dose effect between the quartile of SDOH score and the odds of not achieving these metrics. In the case of high FRS-CVD and obesity, the odds were significant only for quartiles 3 and 4 of the SDOH score.
The correlations between the linear regression–based SDOH score and outcomes were similar in significance and magnitude (eAppendix) to the correlations found with the CFA-based SDOH score. The linear regression found that the most significant were financial strain, social score, and income, but this methodology does not identify correlations among variables.
Our study found that among patients receiving primary care within a large health system in South Florida, patient-reported SDOH variables were significantly associated with the FRS-CVD. Moreover, we report that an increasing SDOH score was significantly associated with a higher FRS-CVD, worsening of most modifiable CVD risk factors, and higher odds of not achieving CVD preventive benchmarks.
Increasingly, professional organizations and CMS encourage the collection of SDOH to improve quality of care and reduce disparities. However, how to use the SDOH information to reduce health disparities has been less clear, and to date most efforts have concentrated on referring individuals with identified social needs to appropriate nonclinical or community services (eg, social work). Our results provide insights on how health systems can use SDOH for risk stratification of specific disparate conditions that affect their quality-of-care metrics. A SDOH score that is predictive of control of CVD risk factors, such as the one we report in this communication, can be a helpful tool to select individual patients who are at risk of poor control and who could benefit from tailored system-based services such as more frequent follow-up; health coaching; and telehealth, psychological, nutritional, or pharmacy support. In addition, our study contributes information on the SDOH that are more likely to affect CVD risk and suggests that SDOH are clustered into 3 domains: financial strain and access to care; education and health literacy; and social isolation. These data may inform the type or content of interventions that could be most helpful to individual patients based on their own social risk. It should also inform future studies that are evaluating the role of upstream SDOH and the mediating effects of SDOH on behaviors and outcomes.18 In models adjusted for age, gender, race/ethnicity, and geocoded income, our study found a strong correlation between the SDOH score and all CVD risk factors except LDL cholesterol and diastolic blood pressure. This contributes to the literature describing that racial disparities in behaviors (eg, smoking) and CVD risk factor control (eg, blood pressure) are mediated by SDOH.7,8,15
Our results support and complement the findings by Caleyachetty et al48 that reported a similar relationship between social risk factors and the achievement of ideal Life’s Simple 7 scores in a sample of US adults. This study defined social risk as low-income, low-education, non-White race, and living alone. In our study, we did not include race/ethnicity and income in our social risk score calculation for 2 reasons: (1) Most of our patient population had an income above the usual economic cutoff points,49 and (2) given that health disparities are most likely to be the result of social and environmental factors and not of biological mediators associated with race,50 we wanted to explore the role of modifiable social risk factors independently. Moreover, there is evidence that the exclusive use of Census-based deprivation indicators may fail to correlate with certain outcomes if local SDOH, which may function as effect modifiers, are not considered.51
Our findings also contribute to the understanding of racial/ethnic disparities. Members of minority groups in our health system were more likely to have a high burden of social risks; however, in our adjusted models, social risks rather than race/ethnicity predicted the difference in CVD risk or control. This supports the theory that the CVD disparities that persist in the United States are more likely mediated by social and environmental factors rather than biological ones.52
We also show the heterogeneity of the Hispanic population. Our Hispanic population had less exposure to barriers that have been described in other studies—such as lack of insurance, language barriers, and low income—but had a high prevalence of social isolation and stress, and one-third still reported difficulty paying for basics.53
Our study has several limitations that deserve mention. First, our SDOH collection strategy required patients to have either a smartphone or computer to access a link to the survey in their patient portal. Although this strategy made the collection feasible, it may have produced a selection biased toward patients who are financially better off and therefore limited the generalizability of findings to groups of patients with access to this type of technology. Although important, this limitation most likely underestimates the impact of SDOH on CVD control. Moreover, it has allowed us to understand that even among patients with more resources, there is a cumulative effect of SDOH on control of CVD risks.54 Thus, all health systems should be interested in addressing the unmet social needs of the populations they serve. Second, we created a weighted SDOH score based on the FRS but have not yet validated it on a separate population or on major adverse cardiovascular events. This limits our ability to comment on the generalizability of the score; however, we believe the findings demonstrate a valid process for using SDOH at a larger scale and for the development of predictive models. Third, certain measures such as blood pressure had significantly more data points than A1C and LDL cholesterol, which could have affected the predictive ability of those models. Fourth, our follow-up period was short and limited our ability to measure the impact of SDOH on metrics of CVD risk factors. Fifth, we excluded NAM-recommended questions that needed timely health system response, such as those on domestic violence. Although a limitation, this adaptation facilitates the dissemination of an automated large-scale risk stratification tool and it reflects all the domains recommended by the AHA position statement.
Our study findings reveal that in an insured population in South Florida, there is a dose-effect relationship between a weighted SDOH score and cardiovascular risk, but some SDOH were more contributory than others. Health systems could use this approach to create a clinical decision tool to identify patients most likely to have adverse CVD outcomes. Future studies should integrate multilevel social and clinical data across different geographic locations and populations to develop models that describe predictors and mediators of health disparities for major adverse cardiovascular events. These data are necessary to understand whether risk engines that include SDOH can be generalizable across populations.
Author Affiliations: Division of Population Health and Computational Medicine (AP, RM, DS, MS, SG, HM, LT) and Division of Cardiology (DS), Miller School of Medicine at the University of Miami, Miami, FL; Geriatric Research Education and Clinical Center, Veterans Affairs Medical Center (AM, LT, FT), Miami, FL.
Source of Funding: Research reported in this publication was conducted under the auspices of the Precision Medicine and Health Disparities Collaborative (Vanderbilt-Meharry-Miami Center of Excellence in Precision Medicine and Population Health), supported by the National Institute on Minority Health and Health Disparities and the National Human Genome Research Institute of the National Institutes of Health under award number U54MD010722.
Author Disclosures: The authors report no relationship or financial interest with any entity that would pose a conflict of interest with the subject matter of this article.
Authorship Information: Concept and design (AP, RM, DS, MS, LT); acquisition of data (AP, DS, MS, SG, LT); analysis and interpretation of data (AP, RM, FT, LT); drafting of the manuscript (AP, RM, DS, SG, HM, LT); critical revision of the manuscript for important intellectual content (AP, RM, DS, HM, FT); statistical analysis (FT, LT); obtaining funding (DS); administrative, technical, or logistic support (AP, DS, MS, SG, HM); and supervision (AP, DS).
Address Correspondence to: Ana Palacio, MD, MPH, University of Miami, 1120 NW 14th St, Ste 967, Miami, FL 33136. Email: firstname.lastname@example.org.
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