The role of modifiable risk factors in the development of dementia in Central and Eastern Europe remains understudied. We aimed to examine the association between 12 risk factors and the incidence of dementia in the Czech Republic and estimate the proportion of new dementia cases that can be attributed to these risk factors. Data of 3805 Czech participants in the Survey of Health, Ageing, and Retirement in Europe (mean age: 70 years, median 6.5-year follow-up) were analyzed. Hazard ratios (HRs) with 95% confidence intervals (CIs) were estimated using Cox hazard models for the association between the risk factors (low education, alcohol use, living alone, obesity, smoking, physical inactivity, high blood pressure, high cholesterol, diabetes mellitus, hearing loss, vision problem, and depression) and probable dementia diagnosis defined based on adapted Lang-Weir algorithm. We estimated the proportion of dementia cases attributable to each risk factor using weighted population attributable fractions (wPAFs). Four risk factors, low education (HR 1.72), depression (HR 1.42), diabetes mellitus (HR 1.53), and physical inactivity (HR 2.13), were significantly associated with dementia and accounted for the largest proportion of attributable risk. The total weighted PAF for all factors was 39.18%. If all risk factors for dementia were eliminated, almost 40% of dementia cases in the Czech Republic could be prevented. More systematic approach is essential for mitigating the adverse impact of risk factors on the incidence of dementia, such as improving education, preventing and treating depression and diabetes mellitus, and promoting physical.

• MeSH
• demence * epidemiologie   MeSH
• deprese epidemiologie   MeSH
• důchod statistika a číselné údaje   MeSH
• incidence MeSH
• lidé středního věku MeSH
• lidé MeSH
• proporcionální rizikové modely MeSH
• rizikové faktory MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• zdravotnické přehledy MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Česká republika epidemiologie   MeSH

BACKGROUND: Social networks are associated with better cognitive health in older people, but the role of specific aspects of the social network remains unclear. This is especially the case in Central and Eastern Europe. This study examined associations between three aspects of the social network (network size of friends and relatives, contact frequency with friends and relatives, and social activity participation) with cognitive functions (verbal memory, learning ability, verbal fluency, processing speed, and global cognitive function) in older Czech, Polish, and Russian adults. METHODS: Linear regression estimated associations between baseline social networks and cognitive domains measured at both baseline and follow-up (mean duration of follow-up, 3.5 ± 0.7 years) in 6691 participants (mean age, 62.2 ± 6.0 years; 53.7% women) from the Health, Alcohol and Psychosocial factors In Eastern Europe (HAPIEE) study. RESULTS: Cross-sectional analyses, adjusted for country, age, and sex, showed positive associations of global cognitive function with social activity participation and network size of friends and relatives, but not with contact frequency in either network. Further adjustment for sociodemographic, behavioural, and health characteristics attenuated the associations with network size of relatives (P-trend = 0.074) but not with network size of friends (P-trend = 0.036) or social activities (P-trend< 0.001). In prospective analyses, network size and social activity participation were also linked with better cognition in simple models, but the associations were much stronger for social activities (P-trend< 0.001) than for network size of friends (P-trend = 0.095) and relatives (P-trend = 0.425). Adjustment for baseline cognition largely explained the prospective associations with network size of friends (P-trend = 0.787) and relatives (P-trend = 0.815), but it only slightly attenuated the association with social activities (P-trend< 0.001). The prospective effect of social activities was largely explained by sociodemographic, health behavioural, and health covariates (P-trend = 0.233). Analyses of specific cognitive domains generally replicated the cross-sectional and prospective findings for global cognitive function. CONCLUSIONS: Older Central and Eastern European adults with larger social networks and greater social activities participation had better cognitive function, but these associations were stronger at baseline than over the short-term follow-up.

• Klíčová slova
• Ageing, Cognitive decline, Cognitive function, Czech Republic, Poland, Russia, Social networks, Social relationships,
• MeSH
• kognice * MeSH
• lidé MeSH
• přátelé MeSH
• průřezové studie MeSH
• senioři MeSH
• sociální sítě * MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH
• Geografické názvy
• Polsko MeSH

The number of people living with dementia and Alzheimer's disease is growing rapidly, making dementia one of the biggest challenges for this century. Many studies have indicated that depression plays an important role in development of dementia, including Alzheimer's disease; depression, especially, during the late life may either increase the risk of dementia or even being its prodromal stage. Despite a notably large number of carried observational studies and/or clinical trials, the association between the late life depression and dementia remains, due to the complexity of their relationship, still unclear. Moreover, during past two decades multiple other (non-)modifiable risk and possibly protective factors such as the hypertension, social engagement, obesity, level of education or physical (in)activity have been identified and their relationship with the risk for development of dementia and Alzheimer's disease has been extensively studied. It has been proposed that to understand mechanisms of dementia and Alzheimer's disease pathogeneses require their multifactorial nature represented by these multiple factors to be considered. In this review, we first summarize the recent literature findings on roles of the late life depression and the other known (non-)modifiable risk and possibly protective factors in development of dementia and Alzheimer's disease. Then, we provide evidences supporting hypotheses that (i) depressive syndromes in late life may indicate the prodromal stage of dementia (Alzheimer's disease) and, (ii) the interplay among the multiple (non-)modifiable risk and protective factors should be considered to gain a better understanding of dementia and Alzheimer's disease pathogeneses. We also discuss the evidences of recently established interventions considered to prevent or delay the prodromes of dementia and provide the prospective future directions in prevention and treatment of dementia and Alzheimer's disease using both the single-domain and multidomain interventions.

• Klíčová slova
• Alzheimer’s disease, apolipoprotein E, dementia, late life depression, obesity, social engagement, substance abuse, testosterone,
• MeSH
• Alzheimerova nemoc * komplikace   epidemiologie   terapie   MeSH
• demence * komplikace   epidemiologie   terapie   MeSH
• deprese * epidemiologie   prevence a kontrola   MeSH
• lidé MeSH
• ochranné faktory MeSH
• prospektivní studie MeSH
• rizikové faktory MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH