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    Prevalence of Mild Cognitive Impairment inIndividuals Aged over 65 in a Rural Ar|over in

    相关热词搜索:Prevalence of Mild Cognitive Impairment in Inpiduals Aged over 65 in a Rural Area in North Greece Magda Tsolaki1,2, Tania Kakoudaki2*, Anthoula Tsolaki2, Eleni Verykouki2, Vassiliki Pattakou3 1 3rd Department of Neurology, Aristotle University of Thessaloniki, Thessaloniki, Greece 2 Greek Association of Alzheimer Disease and Relative Disorders, Thessaloniki, Greece 3 School of Health and Social Welfare, Technological Educational Institute of Crete, Iraklio, Greece Email: * [email protected] Received 21 October 2013; revised 16 December 2013; accepted 25 December 2013 Copyright © 2014 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract There are no data available on the prevalence of Mild Cognitive Impairment (MCI) in Greece, and the existing information about dementia shows important variations depending on the geographical setting as well as the methodology employed. The aim of this study was to determine the prevalence of MCI in inpiduals aged over 65 in a rural area in the north part of Greece. From 1428 residents, 678 were finally examined, with a mean age of 73.35 years. Assessments, including neuropsychological testing, neurological examination and medical history, were used to assign a diagnosis of normal cognition, mild cognitive impairment (MCI), with or without depression, depression or dementia according to suitable criteria. A questionnaire was also used to obtain social and demographic data. The 26.3% were classified as Mild Cognitive Impaired without depression, the 8.8% as Mild Cognitive Impaired due to depression, 5.9% had sole depression, the 2.4% were diagnosed with dementia and 56.6% had normal mental status. The observed prevalence for MCI with and without depression implies a total of 35.1% of all people aged over 65 with MCI in the study area. Mild cognitive impairment is more prevalent in Greece than dementia, and its subtypes vary in prevalence. Keywords Mild Cognitive Impairment; Prevalence; Epidemiology; Greece * Corresponding author. M. Tsolaki et al. 12 1. Introduction Subjects with Mild Cognitive Impairment (MCI) constitute a risk population of developing disability, increased health care costs and progression to dementia and thus a population of big clinical interest. Better characterization of the preclinical stage of Alzheimer’s Disease (AD) has been a crucial challenge for research over the past 10 years. Biological markers are used in different research projects. MCI appears to be the stage at which prevention strategies should prove most efficient in delaying or even avoiding further cognitive decline. The prevalence of MCI is increasing in the developing as well as in the developed world in tandem with the ageing population [1]. Greece is among the countries with the oldest residents and the speed of aging in the Greek population is considered to be one of the fastest in the world [2]. As a result of this ageing process, a significant increase in the prevalence of cognitive impairment is to be expected. The prevalence of MCI cannot be easily estimated precisely at present, mainly due to differences in the definition. There are wide variations between studies which have been held in Europe and worldwide [3]-[6] which can be also explained if we take into consideration the different design used each time and the characteristics of the samples which greatly vary from study to study. Direct age-adjusted comparisons have been made but other variables, such as life style or educational level have also an important impact. Additionally, the diagnostic criteria for MCI are neither objective nor stable, as they are constantly changing [7]. Up to now, few studies have explored MCI in healthy people from the general population, and the most recent results have shown the difficulty in approaching the MCI prevalence, which vary considerably according to the criteria applied [8]. We previously reported our estimates of the prevalence of dementia in Greece [9]. The aim of the present study was to contribute to epidemiological studies to Cognitive Impairment knowledge in Greece by estimating the prevalence of MCI in a rural population over 65 years of age in the north part of the country. 2. Materials and Method 2.1. Study Design This is a door to door, home questionnaire-based study. It lasted from March 2009 to September 2009. 2.2. Setting-Participants. The municipality of Alexander the Great is a rural area in the north of Greece and consists of seven small villages. From 1428 residents over 65 in the municipality list, 678 were finally examined while 423 subjects denied to participate in the study and 327 subjects had moved out of the villages and could not be detected. The most common cause for refusal was lack of interest (41.4%). Other reasons for non participation or refusal included: no available time (27.3%) illnesses (23.1%), suspicion (10.6%), fatigue (2.9%), lack of proxy from husband or children (2%) and finally bereavement (1%). 2.3. Study Procedure This study was carried out by three research assistants, students of the Department of Social Work, Crete, after an intensive three-month training, in collaboration with a neurologist, specialist in dementia, who assessed the patients and who is working at the 3rd Department of Neurology Aristotle University of Thessaloniki. Lists of residents were obtained from the municipal registry office. All registered inpiduals 65 years or older residing in the municipality were eligible for the study. Firstly, we came in contact with the mayor of the municipality of Alexander the Great, to take permission to carry out our research and seek for support in possible situations that would emerge. To encourage participation in the study, wall posters were sent to each village and were put at key points of each village. The study protocol was explained and discussed in meetings with general practitioners, local health authorities and the resident population. In addition, relevant brochures were handed out. We contacted also local authorities (presidents, priests, rural doctors) of each village and asked their help in raising awareness among residents. All participants were assessed in-person in their residence. Firstly, a questionnaire on demographics was administered and included questions about gender, age, education, occupation, marital status, health problems (illness, medication), self care, use of leisure time, lifestyle habits (smoking, alcohol use, exercise) and aware- M. Tsolaki et al. 13 ness/perceptions about AD. After that point, the neuropsychological battery described below was administered and recorded. The scores and results were provided to the neurologist-specialist in dementia, who assessed the patients and who was responsible for the final diagnosis. 2.4. Ethical Considerations The study protocol was approved by the Research Ethics Committee of Aristotle university of Thessaloniki. The researchers informed the participants about the procedures of the study and discussed thoroughly different areas of concern, including data protection. Patients who agreed to participate in the study signed the consent document and were provided with the researchers’ contact details. 2.5. Neuropsychological Assessment Neuropsychological assessment of patient cognitive status was carried out with Mini - Mental State Examination or Hindi Mental State Examination for illiterates, the Instrumental Activity of Daily Living and finally, the Geriatric Depression Scale 1) In our study Mini-Mental State Examination (MMSE) [10] was administered to people who had completed at least 5 years of basic education. In those with fewer years of education we used HINDI test instead [11]. 2) The Instrumental Activity of Daily Living (IADL) test describes tasks in a person’s everyday life and is used to assess the functional status; using telephone, going shopping, preparing own meals, doing housework, laundering, use of transportation, managing medicine, and handling money. However in our study we evaluated only 4 of the 8 questions. Specifically, the questions had to do with the ability to use telephone, use of transportation, medication and financial behavior. The reason we evaluated only these specific questions is that the male population in Greece is not usually involved in housework [12] [13]. 3) The short form of Geriatric Depression Scale (GDS) with 15 closed questions. To assess the mood and emotions of the elderly was also used. Scores of 0 - 6 are considered normal while scores of 7 - 15 indicate depressive symptoms [14]. 2.6. Diagnosis The participants of our study had either normal mental status, or MCI with or without depression, depression or dementia according suitable criteria. We used Petersen’s criteria [15] for MCI diagnosis. 1) Memory impairment: Memory domain composite score >1.0 SD below the mean for age/sex/education. 2) Memory complaint: 2 or more items endorsed from the first 16 subjective cognitive symptoms. 3) Normal mental status: MMSE ≥ 21 (standard MMSE without ageeducation correction); non-memory domain composite scores within 1.0 SD of their means. 4) No functional impairment: all IADL items reported as able to perform independently or with some help. v. Absence of dementia: CDR < 1. Patients with MCI with depression met the criteria above, but the presence of depressive symptoms (GDS > 6) implied possible MCI due to depression. Depression diagnosis was made according DSM-IV [16] criteria, with a final score of MMSE greater than 28, no functional problems, or if any they were due to coexisting health problems. In all these patients the total score of the GDS was greater than 6. Dementia diagnosis was based on DSM-IV criteria; In order to establish the diagnosis, we also took into account all available information that was collected. Specifically, apart from the three screening tools performed (Mini Mental State Examination/Hindi Mental State Examination, Instrumental Activity of Daily Living, Geriatric Depression Scale), we took into consideration factors such as the age of the responder, gender, current employment, marital status, care, health problems, how they live, the municipal district. Emphasis was given on the ability of the inpidual to take medications, since it is the most reliable question of this test. To establish this diagnosis according to the NINCDS-ADRDA [17] criteria we took into consideration functional problems not caused by other health problems. Some participants were found with functional problems although no health problems were reported. These findings, in combination with the low score in the MMSE and the absence of depression led us to the diagnosis of dementia. Finally, responders not included in any of the above categories, had normal mental level. They had high score in the MMSE (>28), no functional problems and absence of depression. M. Tsolaki et al. 14 2.7. Statistical Analysis The raw prevalence of MCI with and without depression was calculated with respect to the total sample of the study. Global prevalence was calculated along with prevalence according to the age group and sex. Global and age specific prevalence was also calculated adjusted for age and sex according to the European standard population. For each prevalence estimate, 95% confidence intervals (95% CI) were also calculated. Chi-squared goodness of fit test was used to check the uniformity MCI with and without depression among age groups. Pearson chi-squared test was used to check the independence between categorical variables such as diagnosis and sex. Odds ratio was used to quantify the effect size of the relationship between MCI with or without depression and sex. One way analysis of variance with Tukey post hoc tests was used to check differences between means of continuous variables for the different diagnostic groups. P values less than 0.05 were considered statistically significant. Statistical analysis was performed using SPSS v20.0 (IBM Corp, Armonk, NY). 3. Results Table 1 shows the crude, age-adjusted and age-and sex-adjusted according to the European standard population prevalence of MCI without depression (178 participants, 26.3%) and MCI with depression (60 participants, 8.8%). In total, 238 of the inpiduals studied (35.1%) were diagnosed with MCI (with and without depression). On standardizing for age, the MCI prevalence decreased in both men and women-the estimated prevalence when adjusted for age was 30.8% (95% CI: 27.3 - 34.3), versus 30.1% (95% CI: 26.6 - 33.5) when adjusted for age and sex. The prevalence of MCI and the prevalence of the subtypes MCI with depression and MCI without depression increased with age (p < 0.001), (Figure 1) and women were seen to predominate among the inpiduals in all three categories. Overall, prevalence of MCI differs among the age categories, both in males (p = 0.032) and in females (p = 0.045). (Table 2) Prevalence of MCI with depression does not differ among the different categories neither in men (p = 0.626) nor in women (p = 0.512). Finally, prevalence of MCI without depression differs among the age categories in men (p = 0.010) but not in women (p = 0.104). Compared with men, women are significantly more likely to develop MCI with depression (OR = 2.44, p = 0.007, 95% CI = 1.27 - 4.71). Table 3 shows the characteristics of the study participants, stratified by cognitive status. Results from oneway ANOVA showed that the mean age of inpiduals was significantly different between the diagnosis categories (p = 0.001). It did not show any significant differences in the mean age of male inpiduals among diagnosis categories (p = 0.055). However there are statistically significant differences in the mean age of women between the categories of cognitive status (p < 0.001). Chi-squared test results showed that there is dependence between gender and diagnosis categories (χ 2 = 23.9, df = 4, p < 0.001) and a dependency between diagnosis categories and years of education (χ 2 = 18.54, df = 8, p = 0.018). 4. Discussion In our study, the observed prevalence of 26.3% for MCI without depression and 8.8% for MCI with depression implies a total of 35.1% of all residents aged over 65 with MCI in the municipality of Alexander the Great. MCI has been variably described according to different assessments, diagnostic criteria and reference populations. In comparison with worldwide studies our MCI results are within the higher range. Ranaglia et al. in Italy, Figure 1. Prevalence of MCI in different age groups. M. Tsolaki et al. 15 Table 1. Crude, age-adjusted and age-and sex-adjusted prevalence of MCI according to the European standard population prevalence of MCI. Crude Age adjusted Age and sex adjusted N (%) 95% CI Percentage (%) 95%CI Percentage (%) 95%CI MCI (with and without depression) Male 95 (32.3) 26.9 - 37.6 24.4 19.5 - 29.4 Female 143 (37.2) 32.4 - 42.1 35.7 30.8 - 40.4 Both 238 (35.1) 31.5 - 38.7 30.8 27.3 - 34.3 30.1 26.6 - 33.5 Age group 65 - 69 49 (26.2) 19.9 - 32.5 70 - 74 86 (36.0) 29.8 - 42.1 75 - 79 51 (36.4) 28.4 - 44.4 80+ 52 (46.4) 37.2 - 55.6 MCI (with depression) Male 15 (5.1) 2.6 - 7.6 4.0 1.8 - 6.3 Female 45 (11.7) 8.5 - 14.9 11.2 8.0 - 14.3 Both 60 (8.8) 6.7 - 10.9 8.1 6.1 - 10.1 7.6 5.6 - 9.6 Age group 65 - 69 14 (7.5) 3.7 - 11.2 70 - 74 18 (7.5) 4.2 - 10.9 75 - 79 14 (10.0) 5.0 - 14.9 80+ 14 (12.5) 6.4 - 18.6 MCI (without depression) Male 80 (27.2) 22.1 - 32.2 20.5 15.8 - 25.0 Female 98 (25.5) 21.1 - 29.9 24.8 20.5 - 28.7 Both 178 (26.3) 22.9 - 29.5 22.7 19.5 - 25.8 22.7 29.5 - 25.8 Age group 65 - 69 35 (18.7) 13.1 - 24.3 70 - 74 68 (28.5) 22.7 - 34.1 75 - 79 37 (26.4) 19.1 - 33.7 80+ 38 (33.9) 25.1 - 42.7 estimated the MCI prevalence about 7.7% [18] while Juarez-Cedillo et al in Mexico reported 6.45% [19] Similarly, another study showed that the prevalence of MCI of 1313 subjects older than 65 years was 28.3% in the United States [20] Also, Guo et al. in China estimated MCI prevalence to be 13.3% [21] while Wada-Isoe et al. reported 23.4% for Japan [22]. Recent findings from neighbor countries are also available and the results provided are also lower than ours. In Bulgaria, MCI prevalence was found to be 6.7%. Totally 607 subjects over 65 years old, a sample very similar to ours, were included; MCI diagnosis was made according to Petersen criteria, modified by Portet et al. [23] In Italy, MCI prevalence was 6% among a sample of 6921 subjects assessed using an operational definition according to MMSE score, but much higher almost 24.5% when psychometrically derived criteria of MCI were M. Tsolaki et al. 16 Table 2. Age and sex prevalence of MCI and its subtypes. MCI (with and without depression) Male Female Age group N (%) CI N (%) CI 65 - 69 21 (42.9) 28.8 - 47.7 28 (57.1) 42.2 - 71.1 70 - 74 36 (41.9) 31.3 - 51.9 50 (58.1) 47.0 - 68.7 75 - 79 17 (33.3) 20.7 - 47.9 34 (66.7) 52.1 - 79.2 80+ 21 (40.4) 27.0 - 54.9 31 (59.6) 45.1 - 72.9 MCI (with depression) Age group 65 - 69 5 (10.2) 3.3 - 22.2 9 (18.3) 8.8 - 32.0 70 - 74 3 (3.5) 0.7 - 9.8 15 (17.4) 10.1 - 27.1 75 - 79 2 (3.9) 0.4 - 13.4 12 (23.5) 12.8 - 37.5 80+ 5 (9.6) 3.2 - 21.0 9 (17.3) 8.2 - 30.3 MCI (without depression) Age group 65 - 69 16 (32.7) 19.9 - 47.5 19 (38.8) 25.2 - 53.7 70 - 74 33 (38.4) 28.1 - 49.5 35 (40.7) 30.2 - 51.8 75 - 79 15 (29.4) 17.5 - 43.8 22 (43.2) 29.3 - 57.7 80+ 16 (30.8) 18.7 - 45.1 22 (42.3) 28.7 - 56.8 Table 3. Sociodemographic, functional, clinical and neuropsychological characteristics of the participants according to cognitive impairment. Normal subjects N (%) Subjects with depression N (%) Subjects with MCI due to depression N (%) Subjects with MCI without depression N (%) Subjects with dementia N (%) p Number of subjects = 678 384 (56.6) 40 (5.9) 60 (8.8) 178 (26.3) 16 (2.4) Age (mean ± sd) 72.5 ± 5.4 74.5 ± 6.1 74.3 ± 6.1 74.3 ± 5.7 75.8 ± 5.9 0.001 Male 73.4 ± 5.4 79.0 ± 7.3 74.5 ± 6.6 74.2 ± 5.6 73.7 ± 8.5 0.055 Female 71.7 ± 5.4 73.3 ± 5.2 74.3 ± 5.9 74.4 ± 5.7 76.3 ± 5.4 <0.001 Sex N (%) <0.001 Male 187 (63.6) 9 (3.1) 15 (5.1) 80 (27.2) 3 (1.0) Female 197 (51.3) 31 (8.1) 45 (11.7) 98 (25.5) 13 (3.4) Years of education N (%) 0.018 0-4 104 (48.1) 18 (8.3) 26 (12.0) 62 (28.7) 6 (2.8) 5-8 264 (59.7) 22 (5.0) 31 (7.0) 115 (26.0) 10 (2.3) 9-12 16 (84.2) 0 (0.0) 2 (10.5) 1 (5.3) 0 (0.0) used [24]. On the contrary, in northern Israel, a high prevalence of MCI, 32.1%, was observed among 944 participants [25]. However, the prevalence of MCI found in our study is lower than the one reported for France (42%) [26] ac- M. Tsolaki et al. 17 cording to revised MCI criteria, with the aid of the following tests: Benton Visual Retention Test, Trail Making Test, Isaacs’ Set Test in a large sample of 6892 subjects over 65 years old and similar to a study from Nigeria where cognitive impairment no dementia (CIND) prevalence was 35.9% in a community of 2487 residents over 65 according specific criteria [27]. There is no other study in the field of prevalence of MCI in Greece and therefore reliable conclusions are difficult to draw. We believe that the high prevalence of MCI we reported is connected with the low prevalence rates we have for dementia. There have been only two studies which estimated the prevalence of dementia in Greece and this is the third one. The first Greek study about prevalence and incidence of dementia was conducted in the municipality of Pylea, Thessaloniki (1993-1997) [9] The age specific prevalence of dementia in Greece was 4.24% between 70 - 74 years, 10,7 % between 75 - 79 years, 10.64% between 80 - 84 years, 11.8% between 85 - 89 and 36.7% over 90 years old. In this study, the prevalence of dementia by age groups is: 1.6% between ages 65 - 69, 1.7% between 70 - 74 years, 4.3% between 75 - 79 years, and in those aged over 80 years was 2.7%. One possible explanation for these findings, which are lower from the previous study, may be that the municipality of Alexander the Great is a rural area while Pylea is an urban area and another one is the unknown age of 9 patients we found with dementia. The third survey carried out in Greece, estimated the prevalence of dementia in Greek Orthodox monasteries [28]. The monks and nuns who live in these monasteries live far from the community, most of them are not married, their mind is always active as they are constantly praying and their diet is poor in lipids. The study reports that dementia is not present in ages between 60 to 75 years in monasteries. The prevalence of dementia is 9% over 80 years old while in Pylea is 9% over 70 years old. Also the prevalence rate in 80 - 84 ages in monasteries is half of the rate in the community. Diet was suggested as a contributor factor to these special findings indicating that nutritional habits could be a keystone. Lifestyle holds a great role as well. Concerning the prevalence of dementia, it does not follow global prevalence rates, as our findings in all three studies are lower than in any other study in Europe or worldwide [29]-[33]. Lifestyle, the Mediterranean diet, the social network and the constant occupation with activities, even after years of retirement could contribute to these findings. The majority of the subjects are farmers and fishermen, who continue their activities several times per week for some years after retirement helping themselves being active. Indeed, several studies highlight the neuroprotective impact of physical activity, which could probably delay the onset of dementia [34] [35]. Also, the important role of family which takes care of their relatives and helps them to remain active is of great value. Attending a day center for elderly as well as attending church services is popular habits for the elderly in Greek countryside indicating that people passing from midlife to late life may have also a rather high social engagement. Many studies have described the association of the Mediterranean diet with a slower cognitive decline [36] [37]. The Mediterranean diet is popular among Greeks. Our study is the first mild cognitive impairment prevalence study in Greece. It shows that mild cognitive impairment affects a large percentage of the elderly we study. 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