Effects of alligator weed invasion on wetlands in protected areas: A case study of Lishui Jiulong National Wetland Park.

Wetlands are one of the ecosystems most easily and severely invaded by alien species. Biological invasions can have significant impacts on local plant communities and ecosystem functioning. While numerous studies have assessed the impacts of biological invasions on wetlands, relatively few have been conducted in protected areas such as national wetland parks.

Homocysteine, hypertension, and risks of cardiovascular events and all-cause death in the Chinese elderly population: a prospective study.

Background: Increased homocysteine levels are associated with the risk of cardiovascular disease (CVD) and death. However, their prevention has not been effective in decreasing CVD risk. This study investigated the individual and combined associations of hyperhomocysteinemia and hypertension with incident CVD events and all-cause death in the Chinese elderly population without a history of CVD.

[A cohort study on mortality and risk of death among population diagnosis as dementia, at base-line survey, in Beijing].

Objective: To study the mortality and risk of death on dementia among ageing population.

Methods: A random sample including 2788 elderly residents was studied. Dementia was diagnosed under the two-phase procedure in 1997.

Residual beneficial effects after a 3-year integrated intervention on stroke in China: a 10-year prospective follow-up.

Objectives: To evaluate whether an intervention program designed to reduce stroke incidence would have long-term residual effects on reducing all-cause and cause-specific mortalities, including cancer 10 years after the intervention was completed.

Methods: This is a posttrial analysis. We prospectively observed the mortality of a community-based trial of primary prevention of stroke in China performed between July 1987 and June 1990 by extending the follow-up to 30 June 2000.

[Metabolic syndrome is an independent risk factor for cardiovascular disease events in patients with ischemic stroke].

Objective: To explore the association between metabolic syndrome (MS) and risk of cardiovascular disease events (CVD) in patients with ischemic stroke.

Method: A total of 1087 patients with ischemic stroke were enrolled from 5 community-based medical centres and underwent baseline evaluation on risk factors of stroke during the period of Jan. 2003 to Dec.

[Study on the incidence and risk factors of dementia in elderly residents from communities in Beijing].

Objective: To study the incidence of dementia and its risk factors among the elderly living in the community of Beijing.

Methods: A sample of 2788 elderly residents from Beijing were investigated regarding the incidence of dementia which was diagnosed using two-stage method in 1997. In the first stage, questionnaire was filled, including MMSE checked up.

[Prospective study on associations between levels of total cholesterol, triglyceride and risk of ischemic and hemorrhagic strokes].

Objective: To explore associations between levels of total cholesterol (TC), triglyceride (TG) and incidence of ischemic and hemorrhagic strokes in populations.

Methods: Baseline investigations on stroke-related risk factors and physical examinations were performed in 10 093 (> 35 years) stroke-free urban community residents from 5 cities in China during May to July in 1987, follow-up investigations on stroke events were made during 1998 to 2000. The hazard ratios and 95% confidence intervals (CI) of ischemic and hemorrhagic strokes in middle, high tertiles of baseline TC or TG levels were compared with low baseline tertile residents using the Cox regression model.

[Effects and trends of stroke and life expectancy among older adults--from 1990s to 2000s].

Objective: To explore the experience of stroke influencing the life expectancy (LE), active life expectancy (ALE), inactive life expectancy (IALE), and the trend of life expectancy among older adults, from 1990s to 2000s in Beijing, China.

Methods: A representative sample of 3257 elderly people living in urban or rural communities in Beijing were followed up from 1990 until 2004. Their health and survival status had been surveyed every 3-5 years.

Stroke and active life expectancy among older adults in Beijing, China.

Purpose: Increasing stroke prevalence, population ageing and economic change in China necessitate a better understanding of the impact of stroke. This study examines the impact of stroke on disability and trends over time.

Method: Data are from longitudinal surveys conducted in the Beijing municipality from 1992 to 1997 and 2000 to 2004.

Influence of different health-care systems on health of older adults: a comparison of Hong Kong, Beijing urban and rural cohorts aged 70 years and older.

Objective: To explore the hypothesis that better health status of elderly populations is primarily determined by the provision of freely accessible health service at low or no cost to the user and a social welfare system.

Method: Information was collected by questionnaire from surveys of three cohorts of elderly (70 years and older) Chinese. Data from two health-care systems were compared: the low-cost or free government-subsidized system in Hong Kong, and the market-orientated user-pays system in urban (Beijing), and rural China.

[Study on the isolated systolic hypertension and its prognosis among 2866 elderly residents at the community level in Beijing].

Objective: We followed a group of community residents above 60 years old to investigate how isolated systolic hypertension (ISH) could influence the prognosis in the long run among the elderly.

Methods: A selected sample of 60 year olds and over from the Beijing residential communities was randomized ascertained to a longitudinal study. Baseline data was collected in 1993 and 11 years later in 2004, the all-cause death, mortality of cardiovascular and cerebrovascular diseases were observed and analyzed.

[Evaluation on a community-based intervention program among people with different risk factors of stroke].

Objective: To evaluate the effect of a long-term community-based intervention program on risk factors of stroke among people with different risk factors.

Methods: In 1987,2 geographically separated communities with 10 000 registered residents of each, were selected as either intervention or control communities in Beijing and Changsha. A cohort containing 2700 subjects at the age of 35 years or older,and free of stroke were sampled from each community.

[Study on the active life expectancy of the elderly and its longitudinal transition in Beijing].

Objective: Focus on the Active Life Expectancy (ALE) of elderly in Beijing and the transition in recent years.

Methods: A representative sample of 3257 elderly people who lived in the urban, suburban and rural communities in Beijing that had been followed up for 12 years. Their health and survival status had been surveyed every 2-3 years.

[A comprehansive evaluation on stroke prevalence among elderly in urban and rural areas of Beijing, 2002].

Objective: To describe the prevalence and disability of stroke as well as the stroke-related diseases among elderly in urban and rural regions of Beijing.

Methods: In 2002, three communities were selected from urban, suburb and rural regions from Beijing areas, respectively. Twenty percent of the elderly were randomly selected from three communities.

Subtype hypertension and risk of stroke in middle-aged and older Chinese: a 10-year follow-up study.

Background And Purpose: Hypertension is the most important indicator of stroke. We aim to compare the long-term effects of the subtypes of hypertension on the risk of stroke in a Chinese cohort.

Methods: A total of 26,587 subjects > or =35 years of age and free of stroke were recruited in 5 cities in 1987.

[Evaluation of predictive effect of some health-related indices on deaths among ageing residents through a 8-years' follow-up study in Beijing].

Objective: To study the predictive effects of some health status indicators to deaths in the elderly population.

Methods: In 1992, a cohort of 3257 people older than 55 years old was formed from Beijing urban and suburb area. Demographic and information of activity of daily living (ADL), self-rated health (SRH), chronic diseases history and other related variables were collected at baseline survey in 1992.

[Community intervention on hypertension and stroke].

Objective: To evaluate the community-based intervention on reduction of hypertension and stroke in different age groups and subtypes hypertension.

Methods: In 6 cities, 2 geographically separated communities with a registered population about 10 000 of each were selected as either intervention or control communities. A cohort containing 2 700 subjects, 35 years or older, and free of stroke were sampled from each community.

[Study on the relationship between self-rated health situation and health status in the elderly-an 8-year follow-up study from Multidimentional Longitudinal Study of Aging in Beijing].

Objective: To study the relationship between self-rated health (SRH) and prevalence of chronic diseases, and all-cause mortality in the elderly population.

Methods: In 1992, a cohort of 3257 people > or = 55 years old was selected from Beijing, the information of SRH and other related variables were collected from 3 157 subjects at the baseline survey. Three follow-up surveys were conducted in 1994, 1997 and 2000, respectively.