Czynniki ryzyka wystąpienia chorób układu sercowo-naczyniowego wśród katolików zamieszkujących tereny południowej Polski

Introduction

There are not many publications concerning research on the effect of religiosity on human health in the Polish scientific literature, although interest in this subject among public health practitioners is growing. However, published data from many epidemiological studies carried out in the world suggest a positive link between religiosity and survival rate and the beneficial effect of religiosity on reducing the incidence of coronary artery (heart) disease, cancer, and mental illness [1–4].
The occurrence of, and mortality due to, diseases of the cardiovascular system are associated with the occurrence of risk factors for atherosclerosis. These can be divided into conventional modifiable risk factors and new modifiable risk factors, as well as non-modifiable risk factors, which cannot be influenced, but which allow us to identify persons at high risk of developing cardiovascular disease (CVD) [5–10].
Diseases of the cardiovascular system are the most serious cause of death in Poland, and in most developed countries [11]. Research on the frequency of occurrence of CVD risk factors in various social/religious groups enables prediction of disease risk and optimisation of preventative actions.

Aim of the research

The aim of the research was to attempt to determine (define) among Catholics:
a) selected modifiable cardiovascular risk factors:
– classical ones: dyslipidaemias, blood pressure, blood glucose level, obesity,
– new ones: homocysteine concentration, C-reactive protein (CRP);
b) the risk of a fatal cardiovascular incident.

Material and methods

This study encompassed anthropometric measurements, physical examination, and laboratory tests (C-reactive protein (CRP), homocysteine, glucose, total cholesterol, high-density lipoprotein (HDL), and triglycerides), as well as an assessment of the risk of occurrence of cardiovascular incidents on the basis of the SCORE scale. Moreover, selected information obtained from a questionnaire survey was used. The cross-sectional study was conducted under statutory project K/ZDS/004688, which received the consent of Komisja Bioetyczna (Bioethics Committee) KBET/79/B/2014. The selection of the test group was targeted. Subjects were recruited from among Catholics living in southern Poland. The research was conducted in Bielsko-Biala and Cieszyn (Silesia), as well as Krakow (Małopolska Voivodeship). The criteria for inclusion in the study were: age 20–96 years, and practising the Catholic religion.
The questionnaire included, amongst other things, questions about socio-demographic data, comorbidities, and medications taken by the studied persons. Anthropometric measurements encompassed body mass and height, as well as waist and hip circumference. Body mass index (BMI) as well as waist-to-hip ratio (WHR) was calculated for each person. Overweight was defined as a BMI of 25–29.9 kg/m², and obesity as BMI ≥ 30 kg/m². Visceral (abdominal, android – apple-type) obesity was defined on the basis of waist circumference (> 88 cm in women and > 102 cm in men), and WHR (a waist-to-hip circumference ratio > 0.9 in men and > 0.8 in women indicating abdominal obesity). The above norms are consistent with European recommendations concerning prevention of cardiovascular diseases in clinical practice from 2012 [12].
Physical examinations encompassed measurement of blood pressure, which was measured three times at intervals of at least 2 min. The first measurement was rejected; average values for systolic and diastolic blood pressure obtained from the second and third measurement were analysed. The division of patients according to blood pressure values was based on criteria in accordance with European recommendations concerning prevention of cardiovascular diseases in cli­nical practice [12]: optimum pressure < 120/80 mm Hg; normal 120–129/80–84 mm Hg; high normal 130–139/ 85–89 mm Hg; above normal blood pressures: arterial hypertension ≥ 140/90 mm Hg: stage (grade) 1 hyper­tension 140–159/90–99 mm Hg; stage (grade) 2 hypertension 160–179/100–109 mm Hg; stage (grade) 3 hypertension ≥ 180/≥ 110 mm Hg; isolated systolic hypertension ≥ 140/< 90 mm Hg.
Laboratory tests encompassed determination of the concentration of: CRP – by the immunoturbidimetric method, glucose – hexokinase method, homocysteine – enzymatic method, triglycerides – enzymatic-colorimetric method (GPO-PAP), total cholesterol – immunoenzymatic method, HDL – ASD direct method. Three test tubes in the Vacutainer system by Beckton Dickinson were used for the following determinations: glucose – plasma fluoride; homocysteine – plasma EDTA/serum; and lipid profile – serum; CRP – serum. All subjects were fasting. Normal ranges of values according to Diagnostyka laboratory: glucose 70–115 mg/dl; lipid profile: total cholesterol 0–200 mg/dl, HDL cholesterol 30–75 mg/dl, triglycerides 0–150 mg/dl; CRP 0–5 mg/l; and homocysteine 0–12 µmol/l.
On the SCORE scale, four categories of cardiovascular risk were distinguished: low (below 1%), moderate (≥ 1% to < 5%), high (≥ 5% to < 10 %), and very high (≥ 10%) [13].

Statistical analysis

Statistical analysis was performed using Microsoft Office Excel 2013 and Statgraphics Centurion software. Verification of the posited hypotheses about the relationship or lack thereof between particular features was performed using the chi-squared (2) test of independence. A level of significance of 0.05 was assumed.

Results

Characteristics of the studied group

In total, 134 Catholics living in southern Poland took part in the study. 78.36% of those surveyed lived in towns; the remainder were inhabitants of the countryside (villages). The majority of the studied persons were women (64.93%). The subjects were aged 20 to 96 years, the average age being 47.66 years. For the purposes of data analysis, subjects were divided into three age groups: under 39 years old (35.82%), 40–59 years old (37.31%), and 60 years old and over (26.87%). Most of the subjects had higher education (56.72%), followed by secondary (24.63%), vocational (13.43%), and primary (basic) education (5.22%). Amongst all the studied persons, 79.85% were working (employed), the most common form of employment being white-collar jobs (67.16%). For the majority of respondents (70.15%), their source of livelihood was their professional work, 22.39% of respondents were retired, 4.5% had a disability pension, while 3.0% of those surveyed lived off an allowance/benefits. All subjects declared that they were practising Catholics. The obtained data indicated that in the studied group, 47.8% of persons suffered from chronic diseases. Most respondents (60.94%) stated that they had hypertension, and the next most common conditions were type 2 diabetes and atherosclerosis of the peripheral arteries (18.75% each), and ischaemic heart disease (17.19%). Furthermore, 9.4% of respondents were diagnosed with kidney disease; 6.25% had had cancer in the past and currently autoimmunological diseases, and 3.12% were diagnosed with cerebrovascular diseases. Moreover, 29.69% of respondents mentioned other diseases, i.e. allergies, thyroid disease, asthma, epilepsy, gout, paroxysmal atrial fibrillation, coeliac disease, and venous insufficiency. Among the chronically ill, 42.54% took medication. More than half of the respondents (66.66%) were taking antihypertensive drugs: 28.7% – lipid-lowering drugs and 21.5% – anticoagulants and antidiabetic medication. Moreover, 36.84% of respondents marked the answer “other”, e.g. Euthyrox, Letrox, Alertec, Zyrtec, Milurit, and Colchicine. Among persons taking medications long-term, 96.49% took them regularly as prescribed by a medical doctor.

Laboratory tests – lipid disorders, blood glucose disturbances, C-reactive protein, homocysteine

Analysing the obtained results of laboratory tests, it was ascertained that half of the studied Catholics (50.75%) had above normal total cholesterol concentration, and this more often concerned women (W) than men (M) (W 55.17% vs. M 42.55%). As many as 93.28% of respondents had normal levels of HDL (“good”) cholesterol, and in 10.34% of respondents (only women) this concentration was above normal, which was a significant difference (2 = 5.21; p = 0.02) in relation to men, 100% of whom had normal concentrations. Analysis of the triglyceride concentrations in the studied group revealed that 26.12% of subjects had above normal values, with elevated results being more frequent in men (W 20.69% vs. M 36.17%). This was a significant difference (2 = 3.79; p = 0.05). In 10.45% of the total sample, the result for fasting blood glucose was above normal. Men more frequently had elevated glucose concentration (W 8.05% vs. M 14.89%). 17.91% of all respondents in the studied group had elevated CRP. Elevated concentrations were more common in women (W 19.54% vs. M 14.89%). An elevated concentration of homocysteine was diagnosed in over half of respondents (60.45%). Men had an elevated results significantly more frequently (M 78.72% vs. W 50.57) (2 = 10.11; p = 0.002) (Table 1).
Analysis of results of laboratory tests in particular age groups (Table 2) showed:
– occurrence of above normal concentration of total cholesterol increased with age – up to the age of 59, and then above 60 years old, it dropped somewhat. Among respondents under the age of 39 years, it was significantly the lowest (2 = 7.06; p = 0.03),
– respondents under 39 and aged 40 to 59 years with HDL cholesterol above normal: 6.25% and 12.00%, respectively,
– triglyceride levels above normal amongst subjects aged 40–59 and over 60 years: 28.00% and 36.11%, respectively,
– elevated glucose concentration most frequently occurred in respondents above 60 years (19.44%),
– respondents aged 40 to 59 and over 60 years had elevated CRP concentration significantly more frequently (14.00% and 38.89%) (2 = 15.74; p = 0.0004),
– respondents aged over 60 years had significantly the highest concentration of homocysteine (83.33%) (2 = 12.3; p = 0.002).
Statistical analysis showed that level of education significantly affected the results of laboratory tests such as: total cholesterol (2 = 12.03; p = 0.007), triglycerides (2 = 11.43; p = 0.009), CRP (2 = 9.33; p = 0.03), and homocysteine (2 = 9.98; p = 0.02). In persons with higher education, the results of these tests were normal. Also, working (being employed) significantly influenced the results of some laboratory tests, such as: glucose concentration (2 = 9.25; p = 0.009), triglycerides (2 = 10.09; p = 0.006), and homocysteine (2 = 8.27; p = 0.02). Results for white-collar workers were normal significantly more frequently than for blue-collar workers and the unemployed. Place of residence only significantly affected homocysteine concentration (2 = 3.78; p = 0.05): persons living in rural areas had normal homocysteine concentration significantly more frequently.

Physical examination

Analysis of the obtained data showed that in the studied group, 32.09% of subjects had normal blood pressure, 26.87% – optimal, and 21.64% – high normal. However, 19.41% of respondents had above normal pressure, significantly more frequently in the case of males (M 31.92% vs. W 12.65%) (2 = 13.89; p = 0.02) (Table 3). Above normal pressure was also most frequent amongst people aged 40–59 years (22%) (Table 4). White-collar workers had normal blood pressure significantly more frequently (2 = 20.09; p = 0.03).

Anthropometric measurements

Body mass index in just under half of the respondents (41.79%) was normal, while 34.33% of respondents were overweight, 21.64% of respondents were obese, and 2.24% were underweight. Overweight (M 40.43% vs. W 31.03%) and obesity (M 27.67% vs. W 18.39%) were more frequent among men than women. Waist-to-hip ratio in the studied group indicated a predominance of gluteal-femoral obesity (53.73%) over abdominal obesity (46.27%), with android (abdominal) obesity predominant in women (54.02%), and gynoid (gluteal-femoral, pear-type) obesity predominant among men (68.09%); this was a significant difference (2 = 5.99; p = 0.01) (Table 5). Amongst white-collar workers, gynoid obesity occurred significantly more frequently than among the unemployed – android obesity dominated amongst the latter (2 = 9.22; p = 0.009). Visceral (abdominal) obesity, when defined on the basis of waist circumference > 88 cm in women and > 102 cm in men, occurred in 36.57% of respondents (W 40.23%; M 29.98%). Thus the results obtained on the basis of waist circumference measurements (alone) were lower than the results obtained on the basis of WHR.

The risk of cardiovascular events in Catholics

Analysis of data evaluated on the SCORE scale allowed us to state that the surveyed Catholics most frequently had a moderate (52.2%) risk of occurrence of cardiovascular events. Low risk was ascertained in 20.9%, high in 15.7%, and very high in 11.2% of respondents (Figure 1).

Discussion

We did not find any results of studies on the prevalence of risk factors among Catholics in the Polish literature. So we decided to compare our own results with the results of a 2002 cross-sectional nationwide survey: NATPOL PLUS (Nadciśnienie Tętnicze w Polsce Plus Zaburzenia Lipidowe i Cukrzyca (Hypertension in Poland Plus Lipid Disorders and Diabetes)), which concerned the prevalence of these factors in a representative sample of adult Poles, in which the most important cardiovascular risk factors turned out to be lipid disorders and hypertension [11]. Bearing in mind that Polish society is homogenous in terms of religion (a CBOS survey in November 2011 showed that 95% of inhabitants of Poland declare themselves to be Catholics), it can be supposed that a significant proportion of those studied in NATPOL PLUS were Catholics.
The age of respondents in the present study (20–96 years) was similar to that of the subjects in the NATPOL PLUS study (18–90 years). 26.87% of the studied Catholics had optimal blood pressure, which is somewhat more than in the NATPOL PLUS study (20%); 21.64% of Catholics had high normal blood pressure (in the NATPOL PLUS study: 30%); 19.41% of Catholics had above normal blood pressure. In our study, persons declaring that they took antihypertensive drugs were not excluded. At the same time, a difference was noted between the percentage of Catholics declaring that they had hypertension (60.94%) and the percentage of Catholics having blood pressure above the accepted norm at the time of having their blood pressure measured (19.41%). However, this may attest to taking medication regularly and effective treatment. In the NATPOL PLUS study, hypertension was ascertained in 29% of respondents; however, in our own study, 60.94% of respondents declared that they had hypertension. The studied Catholics declared that they most frequently took antihypertensive drugs (66.66%), which is somewhat more frequently than respondents in NATPOL PLUS (62%).
Total cholesterol in the NATPOL PLUS study was above normal in 60.7% of respondents, more frequently than among the studied Catholics (50.75%). HDL Cholesterol in the NATPOL PLUS study was below normal in 16.5% of respondents, whilst in our study, there were no subjects with HDL concentration below normal: persons with normal HDL concentration predominated – 93.28%. The percentage of people with hypertriglyceridaemia in the NATPOL PLUS study was 30.1%, and was higher among men than women (37.7% vs. 23.1%, p < 0.001), and was somewhat higher than in our study on Catholics (M 36.17% vs. W 20.69%). The prevalence of hyperhomocysteinaemia in the group of studied Catholics was 60.45%; it was significantly higher among men (M 78.72% vs. W 50.57%; 2 = 10.11, p = 0.0015), and by far the highest in the oldest age group. The result for hyperhomocysteinaemia among Catholics was considerably higher than in the NATPOL PLUS study (17%). There was an elevated level of CRP in the group of studied Catholics in 17.91% of the total sample; it was more common among women (W 19.54% vs. M 14.89%) and in persons over 60 years of age; in the NATPOL PLUS study, the frequency of elevated concentration of hs-CRP was 23.4% (W 25.0% vs. M 21.4%). In 10.45% of all studied Catholics, fasting blood glucose was above normal, especially in men and persons above 60 years of age (W 8.05% vs. M 14.89%). In our own study, we also included persons who declared that they had diabetes. In the NATPOL PLUS study, 1.5% of respondents had irregular fasting blood glucose, 5.6% had diabetes, and 0.6% had impaired glucose tolerance. Undoubtedly, adoption of different normal ranges and somewhat different methodologies, or criteria for inclusion in the respective studies, had an influence on the small differences in results of biochemical tests between the Catholic study subjects and the NATPOL PLUS subjects.
Among Catholics, 34.33% of respondents were overweight – similar to the percentage in the NATPOL PLUS study (33.6%); 21.64% were obese (somewhat more than in the NATPOL PLUS study: 19.1%). Analysing the obtained results in terms of sex differentiation, it was found that more male Catholics than female Catholics were overweight (40.43% vs. 31.03%) and obese (27.67% vs. 18.39%). Similarly, in the NATPOL PLUS study, men were overweight more frequently, but obesity occurred equally frequently in women and in men. The waist circumference to hip circumference ratio (WHR) in the studied group of Catholics indicated a predominance of gluteal-femoral obesity (53.73%) over abdominal obesity (46.27%), with android (abdominal, visceral) obesity predominating in the group of women (54.02%), and gynoid (gluteal-femoral, pear-type) obesity among men (68.09%). In the NATPOL PLUS study, visceral obesity on the basis of waist circumference was ascertained in 35% of women and 19% of men (p < 0.001), and in our own study, it was demonstrated in 29.78% of women and in 40.22% of men.
It is worth noting that in the present study, Catholics with higher education had normal laboratory test results significantly more frequently (total cholesterol, triglycerides, CRP, homocysteine), whereas white-collar workers characteristically more frequently had a normal concentration of glucose, triglycerides, and homocysteine, and normal blood pressure and gluteal-femoral obesity dominated among them.
It is difficult to compare the risk of cardiovascular incidents among Catholics, which was moderate, with the risk in the sample in the NATPOL PLUS study because different tools were used to determine these risks.

Conclusions

In assessing the risk of diseases of the cardiovascular system in Catholics, the most significant risk factors proved to be: among modifiable new biochemical: homocysteine concentration, among modifiable conventional: total cholesterol and triglycerides. In the studied group of Catholics: gynoid obesity prevailed over android obesity, in over half, there existed a moderate risk of occurrence of cardiovascular events, significant non-modifiable variables influencing the risk of CVD were sex and age of the respondents. Nurses should promote pro-health attitudes, encourage the elimination of risk factors and biochemical testing and measurement among Catholics, who are a religious group with higher risk of cardiovascular disease.

Conflict of interest

The authors declare no conflict of interest.

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Address for correspondence:

Anna Majda MD
Faculty of Health Sciences
Jagiellonian University Medical College
ul. Michałowskiego 12, 31-126 Krakow, Poland
Phone: +48 506 26 71 70
E-mail: majdanna@poczta.onet.pl