The Investigation Of Stroke Prevalence And Associated Risk Factors In A Chinese Population Aged 40 Years And Older

Objective: The primary aim of this study is to investigate the stroke prevalence in a Chinese population aged 40 years and older, and to analyze the demographic characteristics and risk factors associated stroke, including hypertension, diabetes,atrial fibrillation, dislipidemia, smoking, apparently overweight or obese, lack of exercise and positive family history of stroke. The variation trend on the prevalence rate and detection rates of stroke risk factors during the period from 2011 through2014 were further described in 40 and older people. We analysis the characteristics of stroke in Tianjin inhabitants compared with the national population.Methods:This study was supported by the special fund for public welfare of National Health and Family Planning Commission in 2014, named “Screening and intervention program for population at high risk of stroke”. Screening of stroke for residents aged40 years and older was carried out on 256 communities from 133 cities and counties,which was selected from 31 provinces, autonomous regions and municipalities directly under the central government and xinjiang production and construction corps using the cluster sampling method. Through cleaning up the database, 726451 cases were admitted in the study. Statistical analysis was conducted on basic information of residents by cross-sectional observation method, which included general date,demographic information, past history, physical examination and laboratory examination.Results:1).The crude prevalence rate was 2.45% in a Chinese population aged 40 years and older in 2014, analyzing from the cluster sampling in the national urban and rural communities, and the standard prevalence rate was 2.11%. 2).The prevalence rate was the highest in northeast regions, followed by north China, and lowest in southwest regions. In brief, the prevalence rate in a population aged 40 years and older was higher in north China than in South China. 3).Stroke prevalence showed a trend of increasing year by year from 2011 to 2014 in a population aged 40 years and older, which were analyzed from the data of six provinces and cities.4).In the stroke patients aged over 40 years, the percent of high risk group was 15.32%. 5).For stroke patients aged 40 years and older, the ratio of common risk factor was 71.76% for hypertension, 52.87% for dislipidemia, 35.37% for apparently overweight or obese and 34.05% for lack of exercise. The following was 29.69% for family history of stroke, 26.74% for smoking, 21.02% for diabetes and 9.99% for atrial fibrillation.6).The risk factors in descending order of detection rates were dislipidemia,hypertention, apparently overweight or obese, lack of exercise, smoking, diabetes,family history of stroke and atrial fibrillation. 7).The top three detection rates of risk factors were smoking, dislipidemia and hypertension in males, dislipidemia,hypertension and apparently overweight or obese in females. 8).Based on data from six provinces and cities, the detection rates of risk factors in a population aged 40 years and older from 2011 to 2014 showed a trend of decreasing in hypertension,atrial fibrillation and positive family history of stroke, while a trend of increasing in dislipidemia, diabetes and apparently overweight or obese. 9).The crude prevalence rate was 2.86% in Tianjin residents aged 40 years and older in 2012 to 2014, and the standard prevalence rate was 2.65%. 10).The detection rates of stroke risk factors in Tianjin stroke patients aged 40 years and older were obviously higher than the national average, which included hypertension, smoking, diabetes, dislipidemia,apparently overweight or obese, lack of exercise and positive family history of stroke, in particular, smoking, lack of exercise and apparently overweight or obese.Conclusion: 1).The stroke prevalence rate is in a high level and is increasing year by year in a Chinese population aged 40 years and older. 2).Stroke patients become younger, so labor ratio is higher, which may increase the social burden. 3).The high detection rates of stroke risk factors in a Chinese population aged 40 years and older,and also in Chinese stroke patients aged 40 years and older indicate that the main cause of stroke is poor control of risk factors. 4).The distribution of stroke and associated risk factors has obvious regional differences, higher in north China and lower in South China. 5).The stroke prevalence rate in Tianjin is in a high level on a national scale, which is increasing year by year. More attentions should be payed to stroke prevention and control in Tianjin.