Abbreviations ESH: European Society of Hypertension; HDL cholesterol: high-density lipoprotein cholesterol; hs-CRP: high sensitivity C reactive protein; IMMIDIET project: Dietary Habit Profile in European Communities with Different Risk of Myocardial Infarction: the Impact of Migration as a Model of Gene-Environment Interaction Project; LDL cholesterol: low-density lipoprotein cholesterol; MONICA study: MONItoring trends and determinants of CArdiovascular disease study; WHR: waist-to-hip ratio.
More than a quarter of the world's adult population had hypertension in the year 2000, a proportion expected to increase to 29% (1.56 billion) by 2025. Men and women have a similar overall prevalence of hypertension, whereas it increases with age in all world regions consistently [1,2].
Hypertension is a major risk factor for coronary artery disease (CAD) [3,4]. Numerous epidemiological studies show that hypertension increases the risk of CAD not only in populations at risk but also in the general population. Because hypertension is one of the major modifiable risk factors for cardiovascular disease, its detection, treatment and control are important health objectives worldwide .
Randomized trials have shown that blood pressure (BP) lowering produces rapid reduction in cardiovascular risk that is highly consistent with prediction of risk reduction inferred from observational studies .
Unawareness, lack of treatment or undertreatment of hypertension is often observed in Western countries. The treatment and control of hypertension are usually more common in North America than in Europe . Several epidemiological studies in European countries showed that individuals with well controlled BP represent a relatively small fraction of the overall hypertensive population, possibly because of inadequate treatment or noncompliance or both [7–12]. Men and women showed similar conditions with regard to the prevalence of awareness, treatment and control of hypertension, with a slightly lower prevalence in male individuals .
The dietary habit profile in European communities with different risk of myocardial infarction: the impact of migration as a model of gene–environment interaction (IMMIDIET) project (http://www.moli-sani.org/progetti/immidietsite/welcome.html ) is a two-phase, population-based cross-sectional study funded by the European Union (EU) and performed by eight partners from seven sites in five EU countries. The first phase was designed to evaluate current dietary habits and metabolic risk profiles for cardiovascular disease of three European regions at different risk of myocardial infarction (MI) according to the MONItoring trends and determinants of CArdiovascular disease (MONICA) study results . Abruzzo (Italy), Limburg (Belgium) and south-west London (England) were selected as European regions at low, medium and high risk for MI, respectively. Unrelated male–female pairs married or living together were recruited to better assess the role of environmental factors in cardiovascular disease. Indeed, (un)married couples allow the identification of determinants of diseases related to environmental or behavioral characteristics as compared with genetic components as pairs share the same lifestyle and socioeconomic environment but as a rule are genetically unrelated.
In the second phase of the project, we considered the historical post Second World War migration from Italy to Belgium as a ‘natural’ model to evaluate gene–environment interaction . Individuals who had migrated to Belgium (Limburg) from southern Italy (Abruzzo) and integrated themselves within the Belgian culture (e.g. through marriage or living together), generated and shared a new lifestyle pattern different from that of either Italian couples living in Italy or Belgian couples living in Belgium. Therefore, individuals with a different genetic background, sharing the same environment, were compared among themselves and with individuals from the respective regions of origin, sharing the same environment and a similar genetic background. As indices of the MI metabolic risk profile, factors such as BP, which are likely to be under the combined influence of both dietary and genetic determinants, were investigated.
The aim of the present report was to assess the prevalence, awareness, treatment and control of hypertension in men and women of the three European communities in the framework of the first phase of the IMMIDIET project.
The IMMIDIET project and the recruitment of participants have been previously described in detail [15–17]. Briefly, this project compares healthy unrelated male–female pairs from regions of England, Belgium and Italy, including both urban and nonurban areas, in order to evaluate current dietary habits and risk profiles of the three communities. In each region, a local general practitioner (GP) network was established to recruit approximately 270 couples. Abruzzo, Limburg and south-west London were chosen as areas at lower, medium and higher MI risk, respectively, according to MONICA data .
Healthy pairs were unrelated male–female spouses or partners living together. To protect against selection bias, the selection of eligible pairs was randomized in each center. A computerized list of all eligible pairs in each practice was generated in advance, and an invitation was made by letter or phone call or both.
Participants were examined in the framework of the practices, by research personnel, who were accurately trained. Recruitment strategies were carefully defined and standardized across the three recruiting centers.
Between October 2001 and October 2003, 1604 participants (802 pairs) aged 26–65 years were enrolled. The participation rate ranged between 70 and 90% in the different centers. Exclusion criteria were a history of cardiovascular disease, type 2 diabetes mellitus, familial hypercholesterolemia, malignancies, chronic diseases such as heart, liver or renal failure, hypothyroidism/hyperthyroidism and epilepsy.
Interviews were performed using a well standardized questionnaire previously adopted in the Olivetti Prospective Heart Study .
The study was approved by the ethics committees of all participating institutions. All study participants agreed to participate by written informed consent.
Blood pressure and anthropometric measurements
Trained research personnel in the different centers of recruitment carried out BP and anthropometric measurements using methods that had been standardized beforehand during preliminary meetings in which all IMMIDIET consortium partners participated. BP was measured with an automated device (Omron-HEM-705CP, Omron Healthcare, Inc., Bannockburn, Illinois, USA) . BP values were recorded three times on the nondominant arm, and the average of the last two values was taken as the BP. Measurements were performed in a quiet room with comfortable temperature with the participants resting in a seated position for at least 5 min . Body weight and height were measured on a standard beam balance scale with an attached ruler, with participants wearing no shoes and only light indoor clothing. BMI was calculated as weight in kilograms divided by the square of the height in meters (kg/m2). Waist and hip circumferences were measured according to the National Institutes of Health, National Heart, Lung, and Blood Institute guidelines  and waist-to-hip ratio (WHR) was calculated.
Definitions of hypertension, awareness, treatment and control of hypertension
Hypertension was defined as systolic BP (SBP) of at least 140 mmHg or diastolic BP (DBP) of at least 90 mmHg or current treatment with antihypertensive drugs in participants with a history of hypertension. Prehypertension [normal or high normal category of classification of BP levels according to European Society of Hypertension (ESH) guidelines 2007] was defined as SBP of 120–139 mmHg or DBP of 80–89 mmHg [22,23]. Optimal BP levels were defined as SBP less than 120 mmHg and DBP less than 80 mmHg .
Treatment (defined as current use of antihypertensive medication) was determined by direct documentation of all medications taken, monotherapy and combination therapy (more than one drug) was also considered. Awareness of hypertension was defined as answering ‘yes’ to the question ‘have you ever been told that you had high BP?’ Controlled hypertension was defined as treated hypertension with SBP less than 140 mmHg and DBP less than 90 mmHg [22,23].
Definition of risk factors
Participants were classified as nonsmokers (if they had never smoked cigarettes), ex-smokers (if they had smoked cigarettes in the past) and current smokers (if they were currently smoking one or more cigarettes per day regularly). Overweight was defined as a BMI of at least 25 kg/m2 and obesity as a BMI of at least 30 kg/m2 in both men and women.
Social status was defined as a score based on two variables: education and job. Education was grouped in three categories: no education or primary school (i.e. less than 8–11 years of education, depending upon the country), which contributed zero points to the score of social status; secondary school (i.e. less than 13–16 years of education), which contributed one point to the score; and college/university/higher level, which contributed two points to the score. Job was grouped in two categories: manual job, which contributed zero points to the score; and nonmanual job, which contributed one point to the score. Previous job was considered for retired participants. Finally, social status was defined as follow: ‘high’ if the score of social status was equal to or higher than three; ‘middle’ if the score was equal to two; and ‘low’ if the score was lower than two. Hypercholesterolemia was considered as a cholesterol level of at least 240 mg/dl or being on pharmacological treatment for hypercholesterolemia.
Blood samples were obtained between 7.00 and 9.00 a.m. from patients who had been fasting overnight and had refrained from smoking for at least 6 h. Blood samples were centrifuged, within 3 h, for 15 min at 3000 rpm.
Different biochemical analyses were centralized in different specialized laboratories from IMMIDIET partners after shipping the required aliquots in dry ice.
Measurements of serum lipids and blood glucose were performed by an automated analyser (Cobas-Mira-Plus, Roche, Milan, Italy). Low-density lipoprotein (LDL) cholesterol was estimated by the Friedwald formula: LDL cholesterol = total cholesterol - [high-density lipoprotein (HDL) cholesterol + triglycerides/5] .
High-sensitivity C reactive protein (hs-CRP) was measured in frozen plasma samples with a latex particle-enhanced immunoturbidimetric assay (IL Coagulation Systems on ACL9000, IL, Milan, Italy). A double quality control at 2.59 mg/l and 6.19 mg/l was used.
Blood glucose, triglycerides and hs-CRP levels were log transformed to normalize their positively skewed distribution. Data are reported as median and 25th–75th percentile (Q1–Q3); a P value of less than 0.05 was chosen as the level of significance. Continuous variables were shown as mean and standard error (SE) and categorical variables as percentages (%). Univariate and multivariate associations of continuous variables with age, sex, BMI, social status and region as confounders were assessed by multivariate analysis of variance [general linear model procedure in Statistical Analysis Software (SAS)]. A multivariate linear regression analysis with interaction terms among regions and age was used to test differences between slopes. All computations were carried out using the SAS statistical package (Version 8.2 for Windows, SAS Institute Inc., Cary, North Carolina, USA) .
Baseline characteristics of women (n = 802) and men (n = 802) in the three populations are shown in Table 1. All environmental and metabolic risk factors were higher or more prevalent in men than in women.
Mean blood pressure levels
The average mean BP (age, BMI, social status and region adjusted) was 128/81 mmHg in men and 118/76 mmHg in women. Men had higher BP levels than women in all three regions. Women from south-west London showed BP levels lower than those from Abruzzo and Limburg (P < 0.001 for both, adjusted for age, BMI and social status, Table 1). Average BP was 120/76 mmHg in Abruzzo, 118/75 mmHg in Limburg and 111/73 mmHg in south-west London. No difference among regions was found in SBP and DBP in men.
Both SBP and DBP increased with age in the total population and in both sexes (Fig. 1). SBP and DBP levels (adjusted for sex, BMI and social status) were lowest in south-west London, highest in Abruzzo and intermediate in Limburg (Fig. 1a). Significant differences (P < 0.05) were found at the 36–40, 41–45, 46–50 and 51–55 year ranges of age for SBP and the 41–45 and 51–55 year ranges of age for DBP between Abruzzo and south-west London participants and at the 36–40, 41–45 and 51–55 year ranges of age for SBP between Limburg and south-west London participants. No difference was found between Limburg and Abruzzo for both SBP and DBP. After stratification by sex, age-specific levels of SBP and DBP (adjusted for BMI and social status) were lowest in south-west London women. Significant differences (P < 0.05) were found at the 36–40, 41–45, 46–50 and 51–55 year ranges of age for SBP and the 41–45 and 51–55 year ranges of age for DBP between Abruzzo and south-west London women and at the 36–40, 41–45 and 51–55 year ranges of age for SBP and the 41–45 year range of age for DBP between Limburg and south-west London women (Fig. 1b). In men, age-specific levels of SBP and DBP between Abruzzo, Limburg and south-west London were not significantly different (Fig. 1c).
After the exclusion of patients under treatment with antihypertensive drugs (9% of the sample), the positive correlation of SBP (r = 0.22, P < 0.0001, sex, BMI and social status adjusted) and DBP (r = 0.18, P < 0.0001, sex, BMI and social status adjusted) with age remained statistically significant, the slopes being not different among regions in the total population (SBP: βsouth-west London = 0.48 ± 0.09, βLimburg = 0.37 ± 0.08, βAbruzzo = 0.44 ± 0.09; DBP: βsouth-west London = 0.24 ± 0.05, βLimburg = 0.15 ± 0.04, βAbruzzo = 0.26 ± 0.06, sex, BMI and social status adjusted) and after gender stratification (data not shown).
Prevalence of hypertension
The age, sex, BMI and social status-adjusted prevalence of hypertension was 20.8% in south-west London, 23.6% in Limburg and 28.8% in Abruzzo (Abruzzo vs. Limburg P = 0.07, Abruzzo vs. south-west London P = 0.005, south-west London vs. Limburg P = 0.4, Fig. 2). Hypertension was more prevalent in men than in women both in the whole sample (29.4 vs. 19.5%, age, BMI, social status and region-adjusted prevalence, P < 0.0001) and in south-west London (26.4 vs. 15.3%, P = 0.001) and Abruzzo (35.2 vs. 22.2%, P = 0.0001), whereas no difference was found in Limburg (26.5 vs. 20.8%, P = 0.09) (Fig. 2).
Abruzzo men had a higher prevalence of hypertension than those from south-west London and Limburg (P = 0.01). Prehypertension prevalence was higher in Abruzzo than in south-west London women (32 vs. 19%, respectively, P = 0.001). Concerning optimal BP levels, women from Abruzzo showed a lower prevalence (45.5%) than those from Limburg (53.5%, P = 0.04) and south-west London (66.2%, P < 0.001, adjusted for age, BMI and social status, Fig. 2). A lower prevalence of optimal BP levels was also found in south-west London and Abruzzo men (33 vs. 24.3%, respectively, P < 0.025, adjusted for age, BMI and social status, Fig. 2).
After stratification for sex and adjustment for age, social status and region, hypertensive women showed BMI, triglyceride, glucose and hs-CRP levels higher than nonhypertensive women, whereas BMI, WHR and HDL cholesterol levels were higher in hypertensive men than in nonhypertensive men (Table 2).
Hypertension awareness, treatment and control
Twelve percent of persons declared having high BP, 1% ignored the BP values, whereas 87% denied having high BP. Only 46.2% of the latter had measured levels of BP that were optimal according to the definition of the ESH guidelines 2007 (south-west London, 55.1%; Limburg, 45.2%; Abruzzo, 39.8%; age, sex, BMI and social status-adjusted prevalence, P < 0.0001), whereas 38.2% had prehypertensive levels of BP (south-west London, 31.2%; Limburg, 41.5%; Abruzzo, 41.8%; age, sex, BMI and social status-adjusted prevalence, P = 0.0009) and 15.6% had hypertensive levels of BP (south-west London, 13.7%; Limburg, 13.4%; Abruzzo, 18.3%; age, sex, BMI and social status-adjusted prevalence, P = 0.06).
A significant proportion (56%) of participants with high measured levels of BP were unaware of their BP levels, with a male predominance (60.7 vs. 43.9%, age, BMI, social status and region-adjusted prevalence, P = 0.001). No significant differences among regions were found (Table 3).
Only 36.5% of the overall hypertensive patients received regular pharmacological treatment; the percentage of patients receiving treatment was lower in south-west London (32.1%) than in Abruzzo (43.5%) and Limburg (42.5%). Hypertension treatment in men was lower than in women, both in the whole population (28.9 vs. 49.8%, age, BMI, social status and region-adjusted prevalence, P < 0.0001) and in each region (Table 3). Forty-six percent of treated patients received a single drug therapy; the most commonly used drugs in monotherapy were β-blockers (40.9%), angiotensin-converting enzyme inhibitors (21.2%) and diuretics (16.7%), followed by calcium channel antagonists (12.1%) and angiotensin II receptor blockers (7.6%). Treated Italian hypertensive patients were more often under combined therapy (75.2%, age, sex, BMI and social status-adjusted prevalence) than Belgian (36.6%, age, sex, BMI and social status-adjusted prevalence, Abruzzo vs. Limburg P = 0.0002) and English (41.4%, age, sex, BMI and social status-adjusted prevalence, Abruzzo vs. south-west London P = 0.008).
Out of those treated for hypertension, only 42, 43 and 47.7% (age, sex, BMI and social status-adjusted prevalence) in Abruzzo, Limburg, south-west London, respectively, reached the target values (Table 3). After exclusion of participants who started antihypertensive therapy in the year of recruitment (10.5%), the percentage of participants on treatment did not change (data not shown).
BP levels, prevalence, awareness, therapy and control of hypertension were evaluated in apparently healthy unrelated male–female pairs from three European communities in the framework of the IMMIDIET project .
As shown by several other studies in general populations, both SBP and DBP were higher in men than in women and increased with age. Women from south-west London, although being on average older, had BP levels lower than women from either of the other regions. These results are in apparent contrast with what was expected from the northern–southern European gradient of MI, as defined by the MONICA data ; indeed, participants classified at high MI risk (such as the English) had lower levels of BP than those at lower risk (such as the Italians). Italian women also showed a higher prevalence of prehypertension than those from the other two regions, whereas the prevalence of hypertension, measured according to the most recent European guidelines , was higher in Italian men, probably because of the lower levels of BP in women than men. Data obtained in larger populations recruited 20 years ago [2,7] showed a higher prevalence of hypertension in English than in Italian people. This apparent discrepancy could be due to a different proportion, in the communities studied, of individuals living alone, with diabetes or cardiovascular disease. All these individuals were excluded from our study and could have a higher level of BP, as suggested by the lower prevalence of hypertension found in all three communities selected for our project. Moreover, it could be partially explained by differences in social level among the communities, as suggested by the decreased difference after adjustment for social status. On the contrary, it could also reflect changes in risk factor prevalence that have occurred during the last two decades [9,11,26]. Recent data from a national survey in England show that SBP and, to a lesser extent, DBP levels progressively declined from 1994 to 2003 . The relatively high prevalence of hypertension (around 29%) measured in the Abruzzo community is in agreement with data reported by more recent studies in Italy using the definition of hypertension according to WHO/International Society of Hypertension guidelines or the Sixth Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure [2,28,29]. Moreover, in a population aged 40–75 years from San Marino Republic (a small independent region in the center of Italy, not far from Abruzzo), hypertension had a prevalence of 46.7%, even higher than the 36% we found in patients from Abruzzo older than 40 years (range of age, 40–64 years) .
Our results underline the critical situation of some areas of Italy, especially its southern regions, where more accurate public health campaigns should be launched and more attention to BP and related lifestyles should be paid by physicians and public health officers. Indeed, recent data from the Italian ‘Cardiovascular Observatory’ (http://www.cuore.iss.it/cuore_exe/osservatorio.asp) reveal that the incidence of stroke is relatively high in Italy, particularly in some regions including Abruzzo .
One of the main focuses of the primary prevention of cardiovascular disease is increasing awareness and treatment of patients with hypertension. This approach has had a positive impact on cardiovascular disease prevention in many countries, especially in the USA where the effort was greatest . However, our study shows that awareness and management of hypertension are far from optimal in all three European areas studied. Our results are in keeping with data from other European studies [2,7–12] but still remain different from those found in the USA in recent years .
No difference was observed in awareness, treatment or control of hypertension among the three populations. Similar to Canada and the USA, men were less aware of being hypertensive and were less likely to receive drug therapy than women . This gap may be related, in part, to the fact that women have more frequent contacts with healthcare practitioners and therefore may benefit better from educational material .
On comparing our results with data from recent national surveys , the treatment rate in hypertensive patients was similar. Among those pharmacologically treated for hypertension, less than half were controlled, according to the ESH . This may be because of a lack of compliance or concordance with the therapy as well as an underestimation of their condition resulting in a less aggressive treatment. Moreover, clinicians need to overcome clinical inertia and step up maximal efforts to reach the BP target values both with lifestyle and pharmacological treatment. A region-wide survey of more than 5000 general practitioners in a region of north-western Italy showed that only a minority of primary-care physicians had sufficient awareness of current guidelines . Increased patient awareness and compliance together with increased adherence of physicians to current guidelines should help in reducing the long-term cardiovascular consequences of hypertension.
There are some limitations to the present study. We did not define a hypertension status but, similar to most epidemiological surveys , measured BP values on one occasion; this procedure has been previously shown to yield false-positive hypertensive cases and a smaller number of false-negative ones. However, the possible overestimation of hypertension should have been offset, at least partly, as BP was measured after 5-min rest by trained research personnel, and the mean values of the last two out of three readings were used for our analyses. In addition, patients had been fasting overnight and had refrained from smoking for at least 6 h before BP measurements. All these factors would result in lower BP readings than those obtained in routine clinical practice.
The validity of comparisons between communities depends critically on the comparability of the survey methods. A strength of our study is the careful standardization of clinical procedures and of the scientific personnel in charge and the centralization of all biochemical analyses. Finally, we cannot consider our data as representative of the overall population of Italy, England or Belgium, as they have been obtained in apparently healthy unrelated male–female pairs living in three regions of these countries.
In conclusion, our comparative study of three European communities indicates some variations in the level of BP, especially in women. Furthermore, this study highlights the limited awareness and in appropriate management of hypertension and the urgent need, in different European regions, for an intensive programme to reduce the gap in effective preventive strategies for the control of cardiovascular disease.
We are grateful to Professor Jozef Vermylen, Catholic University, Leuven, Belgium, for his critical review of the manuscript.
European Collaborative Group of the IMMIDIET Project.
Project coordinator: Licia Iacovielloa; scientific committee: Jef Arnout,b Frank Buntinx,c Francesco P. Cappuccio,d Pieter C. Dagnelie,e Maria Benedetta Donati,a Michel de Lorgeril,f Vittorio Krogh,g Alfonso Sianih; coordinating secretariat: Carla Dirckxb,c; data management and statistics: Augusto Di Castelnuovoa; dietary assessment and analysis: Martien van Dongene; communication and dissemination: Americo Bonannia; recruitment: Carla Dirckx,b,c Pit Rink,d Branislav Vohnout,a Francesco Zitoa.
External advisory committee: Mario Mancini, Napoli, Italy; Antonia Trichopoulou, Athens, Greece
The IMMIDIET group, collaborative centers and associated investigators
- Research Laboratories, Center for High Technology Research and Education in Biomedical Sciences, Catholic University, 86100 Campobasso, Italy (Licia Iacoviello, Francesco Zito, Augusto Di Castelnuovo, Americo Bonanni, Branislav Vohnout, Marco Olivieri, Amalia De Curtis, Agnieszka Pampuch, Maria Benedetta Donati, Giovanni de Gaetano).
- Center for Molecular and Vascular Biology, Katholieke Universiteit Leuven, Leuven, Belgium (Jef Arnout, Carla Dirckx, Ward Achten).
- Department of General Practice, Katholieke Universiteit Leuven, Leuven, Belgium (Frank Buntinx, Carla Dirckx, Jan Heyrman).
- Clinical Sciences Research Institute, Warwick Medical School, Coventry, United Kingdom (Francesco P. Cappuccio, Michelle A Miller); Division of Community Health Sciences, St George's, University of London, United Kingdom (Pit Rink, Sally C Dean, Clare Harper).
- Department of Epidemiology, NUTRIM Subdivision of Nutritional Epidemiology, Maastricht University, Maastricht, The Netherlands (Pieter Dagnelie, Martien van Dongen, Dirk Lemaître).
- Nutrition, Vieillissement et Maladies Cardiovasculaires (NVMCV), UFR de Médecine, Domaine de la Merci, 38056 La Tronche, France (Michel de Lorgeril).
- Nutritional Epidemiology Unit, National Cancer Institute, Milan, Italy (Vittorio Krogh, Sabrina Sieri, Manuela Bellegotti, Daniela Del Sette Cerulli).
- Unit of Epidemiogy and Population Genetics, Institute of Food Sciences CNR, Avellino, Italy (Alfonso Siani, Gianvincenzo Barba, Paola Russo, Antonella Venezia).
The IMMIDIET project was originally supported by European Union grant no. QLK1-2000-00100. MIUR (Ministero dell'Università e Ricerca, Italia), Programma Triennale di Ricerca, grant D. 1588, supported Licia Iacoviello and her associates at the Catholic University in Campobasso, Italy.
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