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PubMed1999

Temporal and geographical distributions of reported cases of Escherichia coli O157:H7 infection in Ontario.

The distribution of 3001 cases of verocytotoxigenic Escherichia coli (VTEC) reported in the Province of Ontario, Canada, were examined to describe the magnitude of this condition geographically and to evaluate the spatial relationship between livestock density and human VTEC incidence using a Geographical Information System. Incidence of VTEC cases had a marked seasonal pattern with peaks in July. Areas with a relatively high incidence of VTEC cases were situated predominantly in areas of mixed agriculture. Spatial models indicated that cattle density had a positive and significant association with VTEC incidence of reported cases (P = 0.000). An elevated risk of VTEC infection in a rural population could be associated with living in areas with high cattle density. Results of this study suggested that the importance of contact with cattle and the consumption of contaminated well water or locally produced food products may have been previously underestimated as risk factors for this condition.

Agriculture↗
PubMedDate not supplied

Individual and community characteristics influencing breastfeeding duration in Vietnam.

This analysis of selected community and maternal characteristics influencing duration of breastfeeding in Vietnam utilized data from the 1988 Demographic and Health Survey and 1990 Accessibility of Contraceptives Survey available for the 4434 children born to 2769 women having their last birth between 1983-88. Explanatory variables included as covariates in the hazards model were mother's education, age of the mother at the time of the child's birth, birth order, and gender of the child, urban versus rural residence, infant mortality risk in the child's province, locality (mountains and highlands compared to delta and coastal), and region of the country (north, south). Indicators of development in the child's village included availability of electricity and public transportation. Breastfeeding duration was longer among the more highly educated women and among those women living in provinces with higher infant mortality. However, there were no significant differences in the duration of breastfeeding with variations among certain development characteristics of the village. Although there were regional differences in the duration of breastfeeding for the rural population, there were no regional differences for the overall population. There were no significant variations in the duration of breastfeeding by age of the mother, birth order or gender of the child. Although there were significant variations in duration of breastfeeding by some maternal and community characteristics, between 80-90 per cent of all women breastfeed for at least the first year of the child's life.

Adolescent↗
PubMed1999

Transitions and inequalities in acute myocardial infarction mortality in New South Wales, 1969-94.

OBJECTIVE: To chart the transition in myocardial infarction mortality in NSW between 1969 and 1994 and to determine whether spatial, marital and occupational status differentials increased over time, despite overall mortality decline. METHOD: The study was undertaken in NSW for the 25-year period from 1969 when mortality from ischaemic heart disease declined. The demographic and spatial analysis involved descriptive epidemiology and utilised the unit list mortality files of the Australian Bureau of Statistics which are based on detailed death certificate information. RESULTS: Spatial, marital and occupational status differentials in myocardial infarction mortality increased over time, more especially variations by occupational status, inland/metropolitan differences, and married/divorced or widowed variation. Spatial variations in mortality were not simply the result of occupational status differences as mortality from white collar groups was also elevated in inland areas. Spatial variation in mortality was not diluted due to the impact of immigration. CONCLUSIONS: Particular subgroups of people remained at risk and it is likely that differential access to ambulance services and travel time contribute, more particularly in inland rural areas. IMPLICATIONS: Groups at risk need to be more precisely targeted for preventative measures and public health initiatives, with particular implications for groups in inland rural areas, the Hunter Region, and outer lower income areas of Sydney.

Adult↗
PubMed1992

[Microhabitats of Aedes albopictus (Skuse) in the region of the Paraiba Valley, São Paulo State, Brazil].

The objective of this study was the determination of extent of the spatial distribution of Aedes albopictus in the Paraíba River Valley, State S. Paulo, Brazil. Thus, collections of larvae and pupae mosquitoes were carried out at six sites distributed along a transection with a 10-km extension. The target was the tree-holes but artificial containers were also used in this investigation. Aedes terrens and Ae. albopictus were the only species of genus Aedes present in the tree-holes mentioned. The segregation of seven species of the tree-hole community was undertaken in the light of macrohabitat and microhabitat features. Thus, the distribution of Ae. albopictus was found to cover the rural, rural-urban and urban zones, but the rural-urban held the preference. Ae. albopictus never present in the residual and primary forest. The favorable factor to infestation with Ae. albopictus in the Paraíba Valley seems to have been the large number of natural niches made vacant by human influence. The rain has been important in the production of larvae and pupae, but the rainfall period does not coincide with the maximum production on them. The tree-holes whose volume exceeded 600 ml were the most productive breeding places. The abundance of these two stages occurs in the summer and autumn. However, the highest peak was observed in the months of March and April. These seasonal variations were found to be common in both the bamboo trap and the artificial container. The temperature data suggest a limit of from 17 to 23 degrees C for the best development of larvae. In the light of this, the strain of Ae. albopictus studied seems to have originated in tropical Asia. Just as happened with Ae. aegypti it may become an important epidemiological vector for the dengue fever and provide links for yellow fever transmission in Brazil.

Aedes↗
PubMed1998

The prevalence and demographic characteristics of consanguineous marriages in Pakistan.

Consanguineous marriages are strongly preferred in much of West and South Asia. This paper examines the prevalence and sociodemographic correlates of consanguineous unions in Pakistan using local and national data. Information from 1011 ever-married women living in four multi-ethnic and multi-lingual squatter settlements of Karachi, the main commercial centre of the country, are compared with data from the national 1990/91 Pakistan Demographic and Health Survey (PDHS), based on information provided by 6611 women. Both sets of results indicate that approximately 60% of marriages were consanguineous, over 80% of which were between first cousins. The mean coefficients of inbreeding (F) in the present generation were 0.0316 and 0.0331 for the Karachi and PDHS data respectively. In both surveys the prevalence of consanguineous unions appeared to be unchanged over the past three to four decades. Consanguineous unions were more common among women who were illiterate or had only primary level education, were first or second generation migrants from rural areas of Pakistan or, in the PDHS, lived in rural areas, and whose parents were also consanguineously married.

Adolescent↗
PubMed2000

A planning framework for community empowerment goals within health promotion.

Health promotion often comprises a tension between 'bottom-up' and 'top-down' programming. The former, more associated with concepts of community empowerment, begins on issues of concern to particular groups or individuals, and regards some improvement in their overall power or capacity as the important health outcome. The latter, more associated with disease prevention efforts, begins by seeking to involve particular groups or individuals in issues and activities largely defined by health agencies, and regards improvement in particular behaviours as the important health outcome. Community empowerment is viewed more instrumentally as a means to the end of health behaviour change. The tension between these two approaches is not unresolvable, but this requires a different orientation on the part of those responsible for planning more conventional, top-down programmes. This article presents a framework intended to assist planners, implementers and evaluators to systematically consider community empowerment goals within top-down health promotion programming. The framework 'unpacks' the tensions in health promotion at each stage of the more conventional, top-down programme cycle, by presenting a parallel 'empowerment' track. The framework also presents a new technology for the assessment and strategic planning of nine identified 'domains' that represent the organizational influences on the process of community empowerment. Future papers analyze the design of this assessment and planning methodology, and discuss the findings of its field-testing in rural communities in Fiji.

Community Health Planning↗
PubMed1990

Social and demographic principles in an alternative typology of cities.

"The authors challenge some conventional notions regarding the USSR's urban hierarchy and settlement network and the basis for functional city classifications. They assign a key role to technological and social change in the overall growth and development process and downplay the role of territorial production complexes vis-a-vis large cities as major regulators of future economic development. Considerable attention is devoted to identifying stages of urban interaction (especially via migration and innovation diffusion) with the rural hinterland and of social-demographic transformations accompanying scientific and technical progress. A city typology based on stages in the 'social-demographic transition' is outlined briefly."

Demography↗
PubMed2003

Modelling faecal indicator concentrations in large rural catchments using land use and topographic data.

AIMS: To characterize and model spatial variations in faecal-indicator organism concentrations in watercourses draining a large rural catchment during the bathing season. METHODS AND RESULTS: Presumptive coliform (PC), presumptive Eschericia coli (PE) and presumptive enterococci (PEnt) concentrations were determined under base- and high-flow conditions at 24 monitoring points in the Rheidol/Ystwyth catchment, Wales. Relationships with land use and topographic variables within their 'subcatchments' were investigated. Geometric mean (GM) concentrations typically increase more than 10-fold at high flow. The proportion of improved pasture within subcatchments explains 81.6, 73.0 and 85.8%, respectively, of the variance in high-flow GM PC, PE and PEnt concentrations. Distributed modelling suggests that organisms derived from more distant parts of subcatchments may be lost through die-off and sedimentation along watercourses at base flow, although not at high flow. Reductions in concentrations are also evident downstream of reservoir impoundments. CONCLUSIONS: Large rural catchments may contribute substantially to faecal indicator loadings in coastal waters. Indicator concentrations can be modelled successfully using land use and topographic data. SIGNIFICANCE AND IMPACT OF THE STUDY: Development of a modelling approach that provides valuable insight into faecal indicator sources and the transport and survival of these organisms within large catchments.

Environmental Monitoring↗
PubMed1993

Menarche and menopause among the Kaibarta women of Dibrugarh, Assam.

"Investigation on the onset of menarche and menopause among [175]... Kaibarta females [living in Dibrugarh, in Assam, India,] is reported. Results are compared with those of the other populations in Assam. From the analysis, it emerges...that some of the observed differences between the population might be due to the effect of ethnic, genetic and rural-urban residence, etc. Secular trends in the age at menarche among populations of Assam are also discussed."

Age Factors↗
PubMed1992

Reflections on Zambia's demographic profile and population policy.

"This paper attempts to describe the nature of Zambia's demographic situation, which eventually led to the formulation of a national population policy; the policy instrument; and some of the measures necessary for the effective implementation of the policy....[The] situation is characterised by three dominant features: a high rate of natural increase, massive urbanisation, and wide variations in fertility and mortality levels between the provinces (independent of differences between rural and urban areas)."

Africa↗