The models of this paper attempt to account for the age, sex, and marital status distributions of human populations. A marriage market develops around preferences for mates of different ages, and we study this market as changes in age distributions change the availability of mates. Unless we know how to relate marriages to the exposed population, we cannot even calculate rates that will tell us...

Maternal age is the most important nongenetic factor influencing the twinning rate. Every study of the effect of other factors should consider the age distribution of the mothers. Besides standardizing techniques, the age-specific twinning rates are analyzed. Especially, the slope of the regression line is considered when the age-specific twinning rates are regressed against maternal age. How w...

This paper explores whether home buyers are myopic about future energy costs. I exploit variation in energy costs in the form of fuel price changes in Massachusetts where there is significant overlap in the geographic and age distributions of oil-heated homes and gas-heated homes. I find that relative fuel price shifts cause relative changes in housing transaction prices that are consistent wit...

OBJECTIVES Non-Hispanic blacks and Hispanics in the United States are more likely to be incarcerated than non-Hispanic whites. The risk of incarceration also varies with age, and there are striking differences in age distributions across racial/ethnic groups. Guided by these trends, the present study examines the extent to which differences in age structure account for incarceration disparities...

This paper explores whether home buyers are myopic about future energy costs. I exploit variation in energy costs in the form of fuel price changes in Massachusetts where there is significant overlap in the geographic and age distributions of oil-heated homes and gas-heated homes. I find that relative fuel price shifts cause relative changes in housing transaction prices that are consistent wit...

This article considers an economy where risk is insurable, but selection determines the pool of individuals who take it up. First, we demonstrate that the comparative statics of these economies do not necessarily depend on its marginal selection (adverse versus favorable), but rather other characteristics. We then use repeated cross-sections of medical expenditures in the U.S. to understand the...

The attached study was discussed in the NRC 2006 review, but was criticized because the osteosarcoma rates of Kenyan provinces were not age-­‐adjusted. However, Kenyan provinces had large populations and it is unlikely there were large differences in ag distribution between provinces. Furthermore, the differences in osteosarcoma rates between provinces were as large as 400%. It is unlikely age ...

background: serologic screening of gastric cancer (gc) by serum pepsinogens (spg) levels and helicobacter pylori (hp) sero-status, though highly informative, has provided heterogeneous results. here, we have evaluated the modifying effects of demographic factors on the risk impact of hp sero-status/spg levels in gastric cancer, with particular emphasis on age. methods: a cross-sectional study w...

Little is known about past and present mortality in Vietnam, as the first official data on mortality have only recently become available from censuses taken in 1979 and 1989. Using these data, I estimate Vietnamese mortality during the intercensal period using two techniques that rely on age-specific growth rates from two successive age distributions. Intercensal emigration and differential com...

OBJECTIVE The aim of the study was to establish the contemporary epidemiological characteristics of Japanese encephalitis (JE) in Guizhou Province. METHODS A retrospective study of National Notifiable Disease Reporting System (NNDRS) data from 1971 through 2009, was conducted to ascertain the geographical, seasonal, and age distributions of JE incidence in Guizhou Province, China. RESULTS A...