INTRODUCTION

Associations between educational status and the development of chronic diseases have been examined in several studies published over the last decades [1,2]. Recently, the US National Bureau of Economic Research [3] stated that each additional four years of education lowered all-cause mortality by almost 1.8% and reduced the risk of heart disease by 2.2%. Socioeconomic factors also seem to be implicated in the relationship between education and cardiac health [4,5]. The CARDIO2000 case-control study was one of the first to report an increased incidence of acute coronary syndrome (ACS) among participants with low levels of education [6]. A recent World Health Organization (WHO) report indicated that deaths due to cardiovascular disease (CVD) are especially prevalent in low-income and middle-income countries due to unequal living conditions, the mal-distribution of health care, and poor social policies [7]. In contrast, strong evidence indicates that higher educational levels are associated with lower CVD risk and better health status in general [1,2].

However, the effect of educational attainment on the prevention of secondary ACS has not been thoroughly examined. Disease management, including better control of lifestyle risk factors and adherence to drug treatment, has been related to socioeconomic status, and in particular education levels. Moreover, it has been reported that patients with less formal education may be less likely to be properly diagnosed, and consequently less likely to receive adequate treatment, due to difficulties in communication between doctors and patients [8,9]. Social gradients in health and disease deserve further attention at the present moment given the global financial crisis that affects numerous people as well as the healthcare system as a whole. In light of the above considerations, and within the context of the Greek acute coronary syndrome (GREECS) study, which is a prospective cohort of 2172 ACS patients from Greece [10], the aim of this study was to evaluate associations between cardiac patients’ educational status and 10-year recurrent ACS events (2004-2014), as well as all-cause mortality, taking into consideration various sociodemographic, lifestyle/behavioral, and clinical factors that may elucidate the relationship in question. The strengths of the present study include the high participation rate (88%) over the entire 10 years of follow-up and the inclusion of ACS patients from different regions (urban and rural) to increase the generalizability of the results.

METHODS

Sampling Procedure and 10-Year Follow-up

From October 2003 to September 2004, almost all consecutive patients (n = 2172) with a discharge diagnosis of ACS (i.e., acute myocardial infarction [AMI] or unstable angina) who had been hospitalized in the cardiology clinics or the emergency units of six major general hospitals in Greece (Hippokration Hospital in Athens and the general prefectural hospitals in Lamia, Karditsa, Halkida, Kalamata, and the island of Zakynthos) were enrolled in the study, with participation rates ranging from 80% to 95%. Of the enrolled patients, 1649 (76%) were males (mean age, 65±13 years) and 523 (24%) were females (mean age, 62±11 years). With the exception of Athens, where there are several other hospitals, all the other hospitals cover the entire populations of the relevant regions, including urban and rural areas. The hospitals were selected in order to represent populations with diverse socioeconomic, cultural and regional characteristics. In 2014, a 10-year follow-up (2004 -2014) of the patients was performed through face-to-face interviews by the investigators. Of the initially enrolled participants, 1918 participated in the follow-up (participation rate, 88%). The remaining 254 patients (11.7%) who were lost to the 10-year follow-up were considered to be censored.

Baseline Diagnosis of Acute Coronary Syndrome and Measurements

At the time of admission, as well as during the course of hospitalization (at 6 to 9 hours, and again at 12 to 24 hours if earlier samples were negative but the clinical index of suspicion was high) biomarkers suggesting cardiac injury and AMI were measured in each patient, including troponin I, creatine phosphokinase (CK), and the MB fraction of total CK (CK-MB). Moreover, a 12-lead electrocardiogram (ECG) was performed and clinical symptoms were evaluated in all patients by a cardiologist involved in the study. AMI was defined by the typical rise and gradual fall (troponin) or more rapid rise and fall (CK-MB) of biochemical markers of myocardial necrosis accompanied by at least one of the following: (1) ischemic symptoms, (2) development of pathologic S-T segment elevations on the ECG, (3) ECG changes indicative of ischemia (S-T segment elevation or depression) or (4) a coronary artery intervention (e.g., coronary angioplasty) [11]. Unstable angina was defined as the occurrence of one or more episodes of angina at rest within the preceding 48 hours, corresponding to class III of the Braunwald classification [12].

We evaluated the following sociodemographic and lifestyle characteristics: age, sex, physical activity, dietary and smoking habits, years of education, and financial status. In particular, educational status, which was the main exposure factor analyzed in the present work, was classified as low (<9 years of school), intermediate (9 to 14 years or technical/vocational school) and high (>14 years). These cut-off values were used because a cut-off of 9 years corresponds to the obligatory level of education, a cut-off of 14 years represents subjects who completed technical/vocational education, and subjects who completed >14 years entered college. Patients’ self-reported mean household annual income over the last three years was recorded. Their usual dietary intake over the year preceding enrollment was assessed by a semi-quantitative food frequency questionnaire, and level of adherence to the Mediterranean dietary pattern was calculated using the MedDietScore (range, 0 to 55) [13]. A modified version of the self-reported questionnaire provided by the American College of Sports Medicine was used to evaluate patients’ physical activity during the previous year [14]. Current smokers were defined as those who smoked at least one cigarette per day at the time of enrollment or had stopped smoking cigarettes during the previous 12 months. The medical history assessment included each patients’ history of hypertension, hypercholesterolemia, diabetes mellitus, and CVD, as well as the techniques used to manage these conditions. All patients were also asked about adherence to medication prescribed for hypertension, diabetes, dyslipidemia, nephropathy, and pre-existing CVD. Body mass index (BMI) was calculated as weight (kg) divided by height squared (m²).

Further details about the procedures and measurements of the GREECS study may be found elsewhere [10].

Endpoints at 10-Year Follow-up

The endpoints studied in the 10-year follow-up of the study were: (1) all-cause mortality and (2) recurrent fatal or non-fatal ACS events. In particular, we recorded the occurrence of new AMIs, angina pectoris, other forms of ischemia (International Classification of Diseases, 9th edition [ICD-9] codes 410.0-414.9, 427.2, and 427.6), heart failure of different types, and chronic arrhythmias (ICD-9 codes 400.0-404.9, 427.0-427.5, and 427.9). Information regarding each patient’s baseline medical history and 10-year endpoints was retrieved through their medical records or hospital registries.

Statistical Analysis

Continuous variables are presented as mean values±standard deviation, while categorical variables are presented as absolute (n) and relative (%) frequencies. Associations between normally distributed continuous variables and education status were evaluated through analysis of variance, after controlling for equality of variances (homoscedasticity). Due to multiple comparisons, the Bonferroni rule was applied to correct for the inflation of type I errors. Associations between categorical variables were tested by the use of the chi-square test. Correlations between continuous variables were evaluated by the use of Pearson’s correlation coefficient for normally distributed variables and by the use of Spearman’s rho coefficient for ordinal or skewed variables. Associations between patients’ education status and 10-year outcomes were evaluated by the use of nested Cox proportional hazard models; the nested models were used to evaluate the potential moderating or mediating effects of various patient characteristics on the research hypothesis. The proportionality of the hazards was graphically tested by plotting the logarithm [−log(survival)] vs. the logarithm of elapsed time. Appropriate tests for goodness-of-fit (i.e., deviance and Pearson’s residuals) were applied. For the 254 censored cases, information was taken from their 1-year follow-ups. The results are presented as hazard ratios (HRs) and their corresponding 95% confidence intervals (CIs). The p-values <0.05 were considered to indicate statistical significance. All statistical calculations were performed using SPSS version 21.0 (IBM SPSS Inc., Athens, Greece).

Bioethics

The study was approved by the medical research ethics committee of the participating institutions and was carried out in accordance with the Declaration of Helsinki (1989) of the World Medical Association. Participants were informed about the aims and procedures of the study and provided written informed consent.

RESULTS

All-cause Mortality and 10-Year Acute Coronary Syndrome Events

The crude overall all-cause mortality was 32.4 per 100 population (n=703) (31.6% in males, 34.8% in females, p=0.17); 52.8% of deaths were due to AMI, 8.3% were due to stroke, 8.3% were due to other CVD events, 8.7% were due to cancer, and the remaining 21.9% were due to other causes. The incidence of fatal or non-fatal 10-year recurrent ACS events were 37.3 per 100 population (n=811) (38.8% in males and 32.9% in females, p=0.02). Moreover, the median survival time was 8.08 years for males and 7.78 years for females (p=0.07); thus, the all-cause mortality rate was 404 deaths per 10 000 population and the recurrent ACS events rate (fatal or non-fatal) was 466 per 10 000 population.

Distribution of Baseline Demographic, Lifestyle, and Clinical Characteristics By Educational Status

Patients in the low-education group were older than those in the intermediate-education and high-education groups, reported more years of active smoking, and were less likely to follow a healthy diet or to have a comfortable financial status (p<0.001 for all variables). In contrast, patients with higher educational levels were more likely to be physically active, had diets that were more similar to the traditional Mediterranean diet, and were less likely to have a history of hypertension or diabetes or a family history of CVD in comparison to patients with lower educational levels (p<0.001); however, they were more likely to be obese (p=0.05). Patients from the low-education group were less likely to have a history of hypercholesterolemia than patients from the high-education group (p<0.001). Furthermore, it was observed that patients in the low-education and intermediate-education groups were less likely to comply with their prescribed medication for various comorbidities in comparison with the high-education group (p<0.001) (Table 1).

All-cause Mortality By Education Level During the 10-Year (2004-2014) Follow-up of Acute Coronary Syndrome Patients

Univariate analysis showed that overall all-cause mortality was almost twofold higher in the low-education group than in the intermediate-education and high-education groups (p<0.001). This difference was lower among females than among males (p<0.001) (Table 2).

Moreover, the median follow-up time for the low-education group was much lower than for the intermediate-education and high-education groups (7.4 vs. 8.8 and 8.9 years, respectively (data not presented in Table 2).

In order to account for the potential confounding of patient characteristics on associations between education status and all-cause mortality, multivariate analysis was applied. Intermediate and low education levels were positively associated with all-cause mortality after adjusting for various potential confounders (Table 3). In particular, ACS patients with a low level of education had a 53% higher risk for all-cause mortality during the follow-up period than those with a high educational level (Table 3, model 1). After adjusting for age; sex; BMI; smoking; a history of hypertension, hypercholesterolemia, or diabetes; a family history of CVD (in order to account for the overall burden of CVD risk); and physical activity status, the impact of educational level on all-cause mortality remained significant only among those in the intermediate-education group (Table 3, model 2). When the MedDietScore, which was used to measure the overall dietary habits of the patients (Table 3, model 3) and alcohol consumption, which has been suggested to be a confounder when studying relationships between socioeconomic status and health (Table 3, model 4), were added to model 2, the relationship between low levels of education and all-cause mortality remained significant (HR, 1.47; 95% CI, 1.00 to 2.17). Alcohol consumption was adjusted for separately from the MedDietScore to avoid co-linearity of these factors in the same model. The inclusion of financial status (Table 3, model 5) did not alter the above relationships, in particular the associations of high/low education status with all-cause mortality in ACS patients (HR, 1.31; 95% CI, 0.89 to 2.00). Finally, when adherence to medication was added to the final model, an aggravating effect of low and intermediate educational levels was observed (HR, 2.08; 95% CI, 1.14 to 3.84 and HR, 3.13; 95% CI, 2.12 to 4.54, respectively) (Table 3, model 6). In all models, only the intermediate-education group remained significantly associated with all-cause mortality.

Recurrent Acute Coronary Syndrome Events By Education Level During the 10-Year (2004-2014) Follow-up of Acute Coronary Syndrome Patients

The risk for a short-term fatal or non-fatal ACS event (i.e., within 30 days after hospital discharge) was substantially higher among the high-education group than in the intermediate-education and low-education groups (p<0.001), whereas at one year after hospital discharge no differences were observed among the education groups (Table 2). The highest 10-year incidence of recurrent ACS events (fatal or non-fatal) was observed in the low-education group, whereas no significant differences were observed between the intermediate-education and high-education groups. Patients with an intermediate level of education (9 to 14 years of formal education) had a better long-term prognosis than the other two groups (Figure 1, Table 2).

In order to further explore associations between education status and the 10-year incidence of ACS, a multi-adjusted analysis was performed (Table 4). Similarly to all-cause mortality, the intermediate-education group showed a significantly higher unprotected effect than the high-education group. Patients in the low-education group did not seem to be protected in comparison with the high-education group. Similarly, after adjusting for patients’ adherence to medication for various comorbidities, no significant effect of educational level on ACS events was observed (HR, 0.82; 95% CI, 0.34 to 2.00) (Table 4, model 6).

DISCUSSION

The present study is one of the very few cohort studies that have investigated the role of educational attainment on the 10-year disease prognosis among ACS patients. It was documented that the least educated patients had a greater risk of developing recurrent (fatal or non-fatal) cardiac events, as well as all-cause mortality in both sexes, than the most educated patients. Accordingly, differences in the severity of disease outcomes were observed among different educational groups. Several studies have demonstrated that education has a significant impact on health [15-17]. However, the mechanisms of this association on the prevention of secondary ACS are not well understood [18]. Low educational status is associated with increased CVD mortality rates among males and females, and it seems to play a major role in the occurrence of CVD [19- 21]; nevertheless, understanding this relationship among already diseased patients may inform new ways of targeting and treating cardiac patients in the future.

The unadjusted analysis revealed that the least educated patients reported less healthy dietary habits, exhibited more major risk factors for another cardiac event (i.e., hypertension, diabetes mellitus, and obesity), and had more years of smoking than the most educated patients (Table 1). Similarly, the EUROASPIRE II study and the 2007-2010 National Health and Nutritional Examination Survey demonstrated that the educational level of ACS patients was inversely associated with the prevalence of current smoking and that most participants had failed to quit smoking [22,23]. In the present study it was also observed that highly educated patients were more physically active than the least educated group. An association between physical activity and CVD was demonstrated in the 1950s by Morris et al. [24], who reported that males with physically active jobs had a lower incidence of coronary heart disease(CHD) than did males with jobs requiring little or no physical activity. Since, then a number of epidemiological studies have demonstrated the cardioprotective effects of regular moderate exercise on the incidence of several chronic diseases, including CHD, and other cardiac outcomes [25,26]. The inverse relationship between education disparities and physical activity is probably embedded in the broader paradigm according to which the least educated patients adopt unhealthy lifestyle habits [6]. However, it has been suggested that cultural instead of socioeconomic factors mediate the relationship between education and CVD [27]. Despite the aforementioned associations, patients’ education status still independently predicted the 10-year prognosis of ACS, suggesting that other moderating or mediating factors must explain this relationship.

Regarding patients’ clinical characteristics, only a history of hypercholesterolemia was more frequent among the high-education group. This may be attributed to the fact that the participants in this group could better control hypertension and diabetes, comply with medication, engage in healthier lifestyle choices, and were more well-off financially, as well as to the possibility that they were diagnosed with hypercholesterolemia more often due to their awareness of their overall medical condition [28]. However, in agreement with the effects of lifestyle factors, the aforementioned disparities in the distribution of cardio-metabolic risk factors by educational level did not affect the association of educational status with 10-year ACS prognosis.

It was also found that the participants in the low-education group were less likely to be obese, in contrast with the prevailing view that obesity is inversely associated with educational level. It seems that over the most recent years, the epidemic of obesity has affected more highly educated groups [29]. Additionally, very recent data suggest that although highly educated people may have more social and financial opportunities, they tend to be employed in more strenuous and demanding positions and are less likely to participate in outdoor recreational activities and, as such, are at an increased risk of obesity, smoking, and excess alcohol consumption, and most likely at a greater risk of CVD [30]. In agreement with previous studies, the present work revealed a U-shaped association between ACS prognosis and education status, with the least and most educated patients negatively affected by lifestyle-related risk factors [31]. A non-linear relationship between education and mortality risk was also observed in a previous study showing that high school graduates had better physical functioning than their counterparts with lower or higher educational levels [32]. Regarding disease progression, it was observed that the high-education group had worse short-term prognoses (30-day ACS events), while the low-education group had worse long-term prognoses (10-year ACS events). Although it has been proposed that socioeconomically deprived patients have higher in-hospital or short-term mortality rates than their less deprived counterparts, the data are inconclusive, indicating the absence of a clear association between socioeconomic background and the short-term course of disease [33]. The fact that at the end of the follow-up period the least educated patients had worse prognoses may be attributed to the quality of disease management due to financial restrictions. Indeed, it has been stated that participation in secondary prevention programs depends mainly on education and income [34]. Low financial status, as another determinant of social class, has been associated with higher 10-year all-cause mortality rates and a higher risk of recurrent ACS events, and this tendency has been attributed to the adoption of unhealthy lifestyle habits and decreased compliance to therapeutic regimens due to financial constraints [35].

Finally, taking into account the likelihood that adherence to medication mediated the effect of education on ACS risk, it could be speculated that patients’ financial status during the 10-year follow-up period may have affected adherence to medications (Table 4). Moreover, the recent financial crisis has mainly affected people with low levels of education by increasing their likelihood of unemployment [36].

Limitations

The present study, despite its strong findings with specific public health implications, has some limitations that should be acknowledged in order to better interpret the results. In studies that use self-reported data, social desirability reporting bias is possible in subjects with both higher and lower educational levels; the former tend to be more aware of the characteristics of a healthy diet and have more knowledge about which food items are healthier, while the latter tend to present a more desirable profile. Additionally, educational level was used as the only indicator of socioeconomic status, although our data also included other social determinants, such as the patients’ financial status. All patient characteristics were measured once, at the baseline examination, and therefore may have been prone to life-course changes during the decade of follow-up. This consideration may influence the robustness of our findings.

In summary, the present 10-year follow-up study revealed that ACS patients with a low level of education were at a higher risk for fatal or non-fatal ACS events as well as for all-cause mortality, irrespective of their lifestyle and clinical characteristics. Low educational status had an adverse effect on longterm ACS incidence as well as on all-cause mortality among cardiac patients. Moreover, high educational levels did not appear to be as protective as has been argued, particularly regarding cardiac outcomes. In light of the recent financial crisis, emphasis should be placed on the pursuit of cost-effective healthcare services, especially among poorly educated and chronically ill patients, in order to close the gap in health disparities. The issues of inequalities in treatment, non-adherence to medical recommendations, and health literacy still remain a great public health challenge. The present analysis implies that less educated patients may be regarded as an emerging high-risk social group in the context of public health intervention strategies.

ACKNOWLEDGEMENTS

Notes

CONFLICT OF INTEREST

The authors have no conflicts of interest associated with the material presented in this paper.

Figure. 1.

Survival curves for fatal or non-fatal acute coronary syndrome events by educational level (<9 years, 9-14 years, >14 years) over 10 years of follow-up of the Greek acute coronary syndrome study patients (A: male, B: female).

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Figure & Data

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