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PubMed2004

Demographic analysis of the variation in the rates of multiple maternities in Sweden since 1751.

To elucidate the causes and mechanisms of twinning and higher multifetal maternities, we have taken advantage of the statistical sources of Sweden, where continuous statistics for the whole population are the oldest available. We found strong secular and regional fluctuations. The rates of multiple maternities were the highest during the last three decades of the 18th century, when the twinning rate was more than 17 per 1,000, the triplet rate was more than 3 per 10,000, and the quadruplet rate was almost 7 per 1 million maternities. During 1849-1873 the twinning rate in Sweden was 14.2 per 1,000, but this rate showed great regional differences, being 18.0 per 1,000 on the island of Gotland and 12.6 per 1,000 in the county of Alvsborg. During this period the twinning rate in the countryside in the county of Stockholm was 20.4, but in the city of Stockholm it was only 14.1 per 1,000. In Sweden after the 1930s there was a marked decrease in the twinning rate, which by the 1960s had fallen to only about half of what it had been two centuries earlier. The corresponding reductions for triplet and quadruplet rates were about 75%. The aim of this paper was to study the temporal and regional variations in multiple maternities in Sweden from 1751 to 1960 based on demographic and some socioeconomic data for the counties. We confirmed our earlier studies that maternal age and parity cannot satisfactorily explain the secular and regional differences in the twinning rates. In contrast to studies in France (1901-1968), we found no unequivocal association between the twinning rates and the crude birth rates. The correlation coefficients between the twinning rate and the crude birth rate showed statistically significant regional and temporal variations. After eliminating the temporal trends, regional differences in the correlation coefficients remained. The twinning rates for the counties seem to converge toward a common low level, 10-12 per 1,000. The observed convergence toward relatively similar levels may be caused by the increased matrimonial migration distances and decreased endogamy of the citizens as a consequence of better communications. The increased urbanization and industrialization that started in the last decades of the 19th century broke up the old static agrarian isolates and caused Sweden, within 2-3 generations, to develop from a poor nation to one of the most prosperous in the world. A more urban and affluent lifestyle, a better diet, and increased stress and sedentary occupations may have reduced the physical capacity of mothers to carry gestations with multiple embryos or fetuses to completion.

Demography↗
PubMed1998

Germany and its immigrants: a socio-demographic analysis.

"Germany is today, along with the USA and Russia, one of the three most important immigration countries worldwide. The authors examine how the immigrant population of Germany has risen despite the fact that the German government has sought to restrict it. They analyse six major streams of migration: refugees and expellees who came immediately after World War II, German resettlers from Eastern Europe (¿Aussiedler'), emigration of (West) Germans, migration between East and West Germany, foreign labour migrants and asylum seekers. The dynamics of immigration within each of these channels was remarkably different. As far as absorption and integration are concerned the authors argue that different groups of immigrants should be treated more equally."

Acculturation↗
PubMed1986

Low rate of population increase of the Gidra Papuans in the past: a genealogical-demographic analysis.

The population increase rate of the Gidra in lowland Papua in the past was estimated using the rate of intergenerational replacement of females based on genealogical records involving 889 women, alive or deceased, who completed reproduction. During the period from a century ago to the time of manifest influence of civilization several decades ago, the Gidra had a constant annual increase rate of about 0.2%. The discussion includes a historical assessment of this rate with reference to the local conditions and an ecological explanation for its microenvironmental variation and suggests a reassessment of the methodology for studying fertility and population growth in anthropological and prehistoric populations.

Female↗
PubMed2001

Demographic analysis of tree colonization in a 20-year-old right-of-way.

Past tree colonization dynamics of a powerline-right-of-way (ROW) corridor in the Haut-Saint-Laurent region of Quebec was studied based on the present age distribution of its tree populations. This colonization study spans 20 years, from 1977 (ROW clearance) to 1996. The sampled quadrats were classified into six vegetation types. Tree colonization dynamics were interpreted in each type, and three distinct patterns were identified. (1) Communities adapted to acidic conditions were heavily colonized by Acer rubrum, at least for the last 12 years. (2) Communities adapted to mesic or to hydric conditions were more intensely colonized in the period 1985-1987 than in the following 9 years; this past success in tree colonization may have been caused by herbicide treatments, which could have facilitated tree establishment by damaging the herbaceous and shrub vegetation. (3) Cattail, vine-raspberry, and reed-dominated communities contained few tree individuals, with almost all trees establishing between 1979 and 1990; those three vegetation types appear as the most resistant to tree invasion in the ROW studied. This study supports the need for an integrated approach in ROW vegetation management, in which the selection of vegetation treatment methods would depend on the tree colonization dynamics in each vegetation type. Minimizing disturbances inflicted on ROW herbaceous and shrub covers should be the central strategy because disturbances jeopardize natural resistance to future tree invasion, except in communities adapted to acidic conditions where the existing vegetation does not prevent invasion by A. rubrum. Many trees are surviving the successive cutting operations by producing new sprouts each time, particularly in communities adapted to mesic and hydric conditions. In these cases, mechanical cutting should be replaced by a one-time stump-killing operation, to avoid repeated and unsuccessful treatments of the same individuals over time.

Conservation of Natural Resources↗
PubMed2006

A demographic analysis of vertical root fractures.

Teeth with vertical root fractures (VRFs) have complete or incomplete fractures that extends through the enamel, dentin and pulp, down the long axis of the tooth. Several different variables were investigated and statistically evaluated as to their correlation with the presence of VRFs. Specifically analyzed were gender, tooth location, age, radiographic and clinical findings, bruxism, and pulpal status. The data were collected from three different endodontists, from three different geographic locations, comprising a total of 227 teeth. Although VRFs may occur in conjunction with any of the parameters investigated, only certain factors were found to occur in a significant number of cases. The results indicate that VRFs are statistically more prevalent in mandibular molars and maxillary premolars. They are associated with periradicular bone loss, pain to percussion, extensive restorations, and seem to occur more often in females and older patients. However, VRFs are not necessarily related to periapical bone loss, a widening of the periodontal ligament space, associated periodontal pockets, a sinus tract, particular pulpal status, or bruxism.

Adult↗
PubMed1999

Phytotherapeutic agents in the treatment of lower urinary tract symptoms: a demographic analysis of awareness and use at the University of Chicago.

OBJECTIVES: To assess awareness and use of phytotherapeutic agents in treating lower urinary tract symptoms (LUTS). METHODS: A survey was conducted of 1280 patients presenting to the University of Chicago Hospitals urology clinic. The questions pertained to age, race, educational level, and use of prescription and nonprescription medications for urinary symptoms. RESULTS: Of 1264 patients filling out the surveys correctly, the 51 to 60-year-old age range demonstrated the greatest percentage of use of these agents. Whites were nearly twice as likely as their African American counterparts to use medicinal botanicals. Men with college or graduate school degrees were 1.5 times as likely to use medicinal botanicals in treating LUTS. More than 50% of men using phytotherapeutic drugs were also taking prescription medications for the urinary symptoms. CONCLUSIONS: There is significant use of phytotherapeutic agents in men with LUTS, although there is variability in their use between patient groups. American physicians need some understanding of these agents to best advise and treat their patients.

Adult↗
PubMed2004

Demographic analysis of members of the American Association of Community Psychiatrists.

This study examines which issues public psychiatrists perceive as having most impacted their careers over the past five years and whether this impact was experienced differently by psychiatrists in varying regions of the country. The author sent a questionnaire to all members of the American Association of Community Psychiatrists in clinical practice for at least five years. Seventy-one percent (344 of 482) responded. As expected, respondents were generally negative about how economic factors have impacted their professional lives. This impact, however, was experienced very differently depending on which region of the country the psychiatrist was working.

Career Mobility↗
PubMed1987

The Saradidi, Kenya, rural health development programme: retrospective demographic analysis.

A census was done in Saradidi, Kenya from 1980 to 1982 as part of a community-based health development programme. The population was 42,755 (excluding 39 persons of unknown age or sex); 17.1% were less than five years old, 46.9% were below age 15, 4.7% were age 65 years or older and 19.7% were women in the reproductive years (age 15 to 44 years). The sex ratio was 86 males per 100 females due principally to migration of adult males for work. The mean number of persons per household was 4.0 and the mean village population was 764. The singulate mean age of marriage for men was 27.0 years and for women 19.9 years; 0.8% of adult men had never married. Only 0.1% of women by age 50 had never been married. Men were significantly more likely than women to be married to more than one spouse, divorce and separation was higher among men, and by age 50 about one-third of women were widows. Men had more years of formal education than women and young people of both sexes more than older people; 73.1% of men and 96.1% of women 60 years and more had never attended school. Infant mortality rates estimated indirectly ranged between 139 and 155 by area. A strong association was found between increasing education of the mother and decreased reported mortality of children. The total fertility of 6.2 was high but lower than the national average possibly because of the high rates of polygamy and primary infertility and the long periods of amenorrhoea and breast feeding which occurred after delivery. This area continues to have one of the highest levels of infant and child mortality in Kenya as well as relatively high fertility and a population with a very young age structure. This implies a continued very rapid rate of population growth which will make more difficult in the future the problems of delivering effective health services and overcoming poverty. A vigorous programme directed toward improving health is indicated which must include family planning.

Community Health Services↗
PubMed1984

An environmental and demographic analysis of otitis media in rural Australian aborigines.

Otitis media (OM) and tympanic scarring prevalence among rural Australian Aboriginal children is examined in relation to age, sex, community size and 34 environmental variables pertaining to living conditions and climate. The environmental variables are reduced to a smaller set of underlying factors via Principal Components Analysis. With age and sex standardized, a multivariate analysis is performed. OM prevalence is profoundly age-dependent, and is related negatively to community socioeconomic status and the presence of swimming facilities. Scarring prevalence is shown to be subject to substantial inter-observer variation, and with the appropriate adjustment manifests an inverse relationship with winter warmth. The data were collected under the National Trachoma and Eye Health Program.

Adolescent↗