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PubMed2000

How does POSSLQ measure up? Historical estimates of cohabitation.

We use March Current Population Survey (CPS) data from 1977 to 1997 to produce a new historical series of indirect cohabitation prevalence estimates. We compare our new estimates with those produced by the traditional method and evaluate the new estimates. We then compare the indirect estimates with the new direct estimates to investigate whether biases exist in the indirect estimates. Our findings indicate that the traditional indirect method of estimating cohabitation prevalence underestimates cohabitors in different subpopulations, especially among those with children. We also find that the new indirect measure produces relatively unbiased estimates of cohabitors' characteristics.

Adult↗
PubMed1976

The genetic structure of finland.

The Finnish gene pool derives primarily from a relatively homogeneous Finno-Ugric population established during the Iron Age (100 B.C.-800 A.D.) in the southwest and southeast of Finland. Gene flow from Sweden to the southwest coastal areas, dating from prehistoric times, as well as the patterns of settlement and migration throughout Finland during the past 1000 years, appear to have been the major biosocial factors underlying the genetic structure of the contemporary population. Analysis of genetic variation and covariation at nine polymorphic loci in a large random sample of rural Finns, partitioned into either 8 countries or 27 geographic districts, showed that all of the essential features of the genetic structure suggested by the archaeological and historical data could be distinguished. Procedures for obtaining inference on the genetic structure of such a population are reviewed, including coefficients of similarity and (genetic) distance among subpopulations, the relation between linear or planar geographic structure and genetic covariation, and the methods for describing allelic differentiation. Bias resulting from the inappropriate assumption of a simple phylogenetic model can be substantial, expecially for the analysis of isolation by distance; procedures for avoiding misleading inference on the genetic structure are demonstrated.

Demography↗
PubMed2006

Estimation of effective population size for the long-lived darkblotched rockfish Sebastes crameri.

We report the variance effective population size (Ne) in darkblotched rockfish (Sebastes crameri) utilizing the temporal method for overlapping generations, which requires a combination of age-specific demography and genetic information from cohorts. Following calculations of age-specific survival and reproductive success from fishery data, we genotyped a sample (n = 1087) comprised by 6 cohorts (from 1995 to 2000) across 7 microsatellite loci. Our Ne estimate (Ne) plus 95% confidence interval was (Ne) = 9157 [6495-12 215], showing that the breeding population number could be 3-4 orders of magnitude smaller than the census population size (N) = 24 376 210). Our estimates resemble closely those found for fishes with similar life history, suggesting that the small (Ne)/(N) ratio for S. crameri is most likely explained by a combination of high variance in reproductive success among individuals, genetic structure, and demographic perturbations such as historical fishing. Because small (Ne)/(N) ratios have been commonly associated with potential loss of genetic variation, our estimates need careful consideration in rockfish management and conservation.

Animals↗
PubMedDate not supplied

The population of a Wiltshire village in the nineteenth century: a reconstitution study of Berwick St James, 1841-71.

This paper reports an exploratory reconstruction of the village of Berwick St James in Wiltshire using nominative information from nineteenth-century English censuses and ecclesiastical registers of baptisms, marriages and burials between 1841 and 1871. The data are first described, and a procedure for sorting and linking records from different censuses, and for linking census records to registration records, is outlined. A detailed analysis of population turnover in the village reveals that after 1851 there was a period of heavy net out-migration. Those who left the parish were overwhelmingly young people, and females were more likely to move out than males: almost all the females born in the parish between 1841 and 1851 had moved away by 1871. A consequence of this pattern of out-migration was that by 1871 there was a shortage of females in the marriageable age-groups (15-29 years). It is clear that this method of reconstructing English village populations promises new insights into the demography of rural England in the nineteenth-century, including, in addition to population turnover and migration patterns, such aspects as fertility levels and trends. A number of problems with the technique remain, however, notably our ignorance of the typical length of the period between birth and baptism.

Demography↗
PubMed1992

[The demographic transition in Finland and Hungary].

"The study compares demographic transition in Finland and Hungary in the 1881-1986 period. The analysis focuses on the classical two-factor model of demographic transition, i.e. the effect of fertility and mortality on the number and age composition of inhabitants.... The author [also] presents six population projections, prepared with the [cohort] method, covering the period of 1991-2041. By means of these he compares the likely changes in the number and age composition of inhabitants in Finland and Hungary." (SUMMARY IN ENG AND RUS)

Age Distribution↗
PubMed2000

Demography of longevity: past, present, and future trends.

Life expectancy at birth has roughly tripled over the course of human history. Early gains were due to a general improvement in living standards and organized efforts to control the spread of infectious disease. Reductions in infant and child mortality in the late 19th and early 20th century led to a rapid increase in life expectancy at birth. Since 1970, the main factor driving continued gains in life expectancy in industrialized countries is a reduction in death rates among the elderly. In particular, death rates due to cardiovascular disease and cancer have declined in recent decades thanks to a variety of factors, including successful medical intervention. Based on available demographic evidence, the human life span shows no sign of approaching a fixed limit imposed by biology or other factors. Rather, both the average and the maximum human life span have increased steadily over time for more than a century. The complexity and historical stability of these changes suggest that the most reliable method of predicting the future is merely to extrapolate past trends. Such methods suggest that life expectancy at birth in industrialized countries will be about 85-87years at the middle of the 21st century.

Female↗
PubMed2003

Value-added animal agriculture: inclusion of race and gender in the professional formula.

The Morrill Act establishing the land grant university system created public higher education institutions and paved the way for women and racial minorities to access them. Today women are -50% of the undergraduate population in animal science (AS) departments at the original land grant state universities, but racial minorities lag far behind, in part because the schools created under the 1890 legislation provided a diversion away from the state universities. Demographic trends from the U.S. Census and the Bureau of Labor Statistics indicate increasing positive growth in nonwhite workforce participation, with concurrent decreases in non-Hispanic male participation; men and women will be nearly equally represented by early in the 21st Century. In the faculties of AS departments, both women and minorities are seriously under-represented; causative factors underlying this phenomenon are similar. Although, historically, adherence to role stereotypes and divisions of labor explain some of the under-representation, these assumptions do not hold across all economic classes. Other factors contributing to the scarcity of women and faculty of color in AS include assumptions and mechanisms of scientific research itself; the very neutrality and disinterestedness of researchers, inherent in the scientific method, prevent recognition that values and personal biases affect decisions of hiring selections and mentoring effectiveness. We explore the cultural factors that underlie these values and biases that are common not only to agriculture but also to science more broadly.

Agriculture↗
PubMed2006

Neuropsychological dysfunction following repeat concussions in jockeys.

BACKGROUND: Single and repeat concussions have a high prevalence in sport. However, there is limited research into longterm risks associated with single and repeat concussions. OBJECTIVES: To determine the effects of single and repeat historical concussions on the neuropsychological functioning and neurological reports of licensed jockeys. METHODS: Six hundred and ninety eight licensed jockeys in the UK were assessed for neurological and neuropsychological symptoms of concussion at least three months after potential episodes. RESULTS: Jockeys reporting multiple historical injuries versus a single injury showed reliable decrements on a measure of response inhibition and, to a less robust degree, on divided attention. Younger adults showed greater vulnerability. CONCLUSIONS: Repeated concussion is associated with reliable decrements in cognitive performance--even after a three month window for recent recovery.

Adolescent↗
PubMed1982

Demographic disaggregation in the construction of regional econometric models: a statistical evaluation.

"A cohort-component method is used to construct historical annual age/sex disaggregations of total population. In econometric models of six substate areas [in the United States], regressions are estimated with and without the disaggregated data for five model variables expected to be dependent on the size of particular population subgroups. Statistical tests are performed to determine significant differences in residual variance of estimation with and without the disaggregated data. Although age/sex population projections may be a desired model output per se, the results indicate that the population subgroup data generally do not improve estimation of other model variables." (summary in FRE, ITA, JPN, )

Age Distribution↗
PubMed2005

Gene diversity in some Muslim populations of North India.

North Indian Muslim populations have historical, linguistic, and socioreligious significance to the Indian subcontinent. Although sociocultural and political dimensions of their demography are well documented, no detailed genetic structure of the populations is available. We have undertaken a survey of the gene frequencies of the ABO, Rh, PTC taste ability, sickling, and G6PD systems for different endogamous groups: Sheikh, Syed, Pathan, Ansari, Saifi, and Hindu Bania. All the groups at most loci showed statistically nonsignificant differences, except for ABO and PTC traits, for which interpopulational differences were seen. Heterozygosity ranged from 0.048 to 0.617 among the Sheikh, 0.149 to 0.599 among the Pathan, 0.105 to 0.585 among the Ansari, 0.25 to 0.869 among the Syed, 0.107 to 0.565 among the Saifi, and 0.100 to 0.492 among the Hindu Bania. The average D(ST) and G(ST) values for the five marker loci were 0.0625 +/- 0.098 and 0.1072 +/- 0.041, respectively. A dendrogram was constructed using the UPGMA clustering method. Our results revealed that the Pathan and the Sheikh form one cluster, the Syed and the Hindu Bania form another cluster, and the two clusters join together (the so-called higher caste); also, the Saifi and the Ansari form a separate cluster (lower caste). The results of the genetic distance analysis are useful for understanding the pattern of genetic relationships between different endogamous groups of Muslims.

ABO Blood-Group System↗
PubMed1981

Dutch international migration statistics, 1820-1880: an analysis of linked multinational nominal files.

"International migration statistics in the nineteenth century are acknowledged to be deficient and biased, but there are few source-critical studies to determine the extent of underreporting and omissions. This article provides a critical analysis of the statistics of Dutch emigration to North America in the period 1835-1880, based on the method of nominal record-linkage of computer files derived from Netherlands emigration lists and U.S. ship passenger manifests. Published and unpublished official records in the Netherlands, U.S.A. and Canada are used to determine the extent of underreporting, the structural biases in the migration data and the 'true' annual Dutch immigration rate to the United States."

Americas↗
PubMed2005

Understanding the occupational deprivation of refugees: a case study from Kosovo.

BACKGROUND: Occupational deprivation as a concept has been presented and discussed in the occupational therapy and occupational science literature for the past several years. The discussion to date, however, has been largely exploratory and theoretical in nature. PURPOSE: This article represents the author's attempt to further understandings of occupational deprivation as a lived experience through research undertaken with Kosovar refugees living in Australia. METHOD AND RESULT: The article focuses on the story of one of the participants of the study which is presented as a case study to illuminate aspects of occupational deprivation as a process occurring over time. The case study is interwoven with interpretive commentary, which serves to highlight key issues as to how occupational deprivation may be experienced by groups of people in different cultural, historic and societal contexts and how it may therefore be addressed by occupational therapists. PRACTICE IMPLICATIONS: The article concludes with reflections on future directions with respect to both further research and professional action. In particular, the focus of professional action is oriented to a population-based approach.

Adult↗
PubMed2005

Contrasting quaternary histories in an ecologically divergent sister pair of low-dispersing intertidal fish (Xiphister) revealed by multilocus DNA analysis.

Recurrent glacial advances have shaped community histories across the planet. While biogeographic responses to glaciations likely varied with latitude, the consequences for temperate marine communities histories are less clear. By coalescent analyses of multiloci DNA sequence data (mitochondrial DNA control region, alpha-enolase intron, and alpha-tropomyosin intron) collected from a low-dispersing sister pair of rocky intertidal fishes commonly found from southeastern Alaska to California (Xiphister atropurpureus and X. mucosus), we uncover two very different responses to historical glaciations. A variety of methods that include a simulation analysis, coestimates of migration and divergence times, and estimates of minimum ages of populations sampled up and down the North American Pacific coast all strongly revealed a history of range persistence in X. atropurpureus and extreme range contraction and expansion from a southern refugium in X. mucosus. Furthermore, these conclusions are not sensitive to the independent estimates of the DNA substitution rates we obtain. While gene flow and dispersal are low in both species, the widely different histories are rather likely to have arisen from ecological differences such as diet breadth, generation time, and habitat specificity.

Animals↗
PubMed2005

A life course approach to chronic disease epidemiology.

A life course approach to chronic disease epidemiology uses a multidisciplinary framework to understand the importance of time and timing in associations between exposures and outcomes at the individual and population levels. Such an approach to chronic diseases is enriched by specification of the particular way that time and timing in relation to physical growth, reproduction, infection, social mobility, and behavioral transitions, etc., influence various adult chronic diseases in different ways, and more ambitiously, by how these temporal processes are interconnected and manifested in population-level disease trends. In this review, we discuss some historical background to life course epidemiology and theoretical models of life course processes, and we review some of the empirical evidence linking life course processes to coronary heart disease, hemorrhagic stroke, type II diabetes, breast cancer, and chronic obstructive pulmonary disease. We also underscore that a life course approach offers a way to conceptualize how underlying socio-environmental determinants of health, experienced at different life course stages, can differentially influence the development of chronic diseases, as mediated through proximal specific biological processes.

Age Distribution↗
PubMed1996

Assessing the reliability of paleodemographic fertility estimators using simulated skeletal distributions.

The reliability of published paleodemographic fertility reconstruction methods was assessed using simulated age-at-death distributions and a published cemetery series from a population with known birth rates. In the first test, the Brass ([1971] Biological Aspects of Demography, pp. 69-110) LOGIT models were used to generate 180 simulated skeletal samples of various sizes (N = 50, 100, 250) from hypothetical populations with known demographic rates. The base populations were expanding (r = 0.01), stationary, or declining (r = -0.01), yet all had the same life expectancy. Growth differences resulted from different fertility rates. The simulated skeletal series were then analyzed using the model life table fitting procedure outlined by Paine ([1989a] Am. J. Phys. Anthropol. 79:51-62), three commonly employed age ratio tests (Bocquet-Appel and Masset [1892] J. Hum. Evol. 11:321-333; Buikstra et al. [1986] Am. Antiquity 51:528-546), and one age-at-death ratio not previously published. In the second test the model life table fitting procedure was used to estimate fertility for a historical population, the Newton Plantation, Barbados (Corruccini et al. [1989] Am. Antiquity 54:609-614), with known demographic characteristics.

Age Determination by Skeleton↗
PubMed2006

Demographic expansion and subtle differentiation in the long-tailed hake Macruronus magellanicus: evidence from microsatellite data.

The impact of geographic heterogeneity and historical demographic factors on genetic diversity in the commercially exploited hake Macruronus magellanicus was examined applying microsatellite markers. A total of 450 fish from 6 different sites, collected in Atlantic Patagonia, were genotyped at 6 polymorphic loci. While analysis of variance-based methods (Fst-Rst) failed to detect differentiation, the exact test for genic differentiation and factorial correspondence analysis revealed subtle differences between coastal and continental shelf edge samples. Data suggest that M. magellanicus has been subjected to a demographic expansion 2.6 to 5 times its original size that occurred approximately 100,000 to 200,000 years ago. Another more recent expansion seems to have occurred a few generations ago. Implications of subtle structuring and demographic instability are discussed.

Animals↗
PubMedDate not supplied

Genetic structure and population history of Ireland: a comparison of blood group and anthropometric analyses.

Population structure and history may be studied on a local or a regional level. This paper examines the regional population structure of the Republic of Ireland and Northern Ireland with respect to population history and demographic processes. Blood-group and anthropometric data obtained from the literature are analysed. The blood-group data consist of ABO and Rhesus gene frequencies for 32 counties and the Aran Islands. Anthropometric data consist of summary statistics for 15 variables collected from 19 regions. The degree and pattern of population differentiation is assessed using new methods of population-structure analysis. Both blood group and anthropometric analyses show a west-east division of populations corresponding to the known history of inhabitation of Ireland, where successive waves of immigrants pushed earlier populations further west. In both analyses there were two deviations to this basic pattern: the Aran Islands and the midlands. In both cases, alternative historical explanations are examined. The genetic relationship of the Aran Islands to the rest of Ireland and England appears to be due to English admixture following the garrisoning of soldiers several centuries ago. The genetic position of the midlands is more complex, but suggests the effects of early Viking inhabitation. These findings are related to studies of the local, rather than regional, population structure of Ireland.

Anthropometry↗