نتایج جستجو برای: since 1980
تعداد نتایج: 529122 فیلتر نتایج به سال:
This report summarizes some of the notable recent trends in household and family characteristics and contains detailed demographic data from the March 1985 Current Population Survey. Highlights of the topics presented in the report include: 1) the number of married-couple families has increased by 3% since 1980, versus an 18% increase for other types of families; 2) household size dropped fro...
OBJECTIVE The aim of the study was to examine the trends which have occurred during the past generation in body mass index (BMI) and in the prevalence of overweight and obesity among children in public schools in Nuuk, Greenland. STUDY DESIGN The study is a retrospective cohort study of BMI among inschooling children (age 6 or 7 years old). A database was created on the basis of files from sc...
Since the late 1980s, the number of jurisdictions with competition laws has grown from roughly 20 to nearly 130. At least two basic questions arise from the remarkable modern expansion of a regulatory discipline established in North America in the late 19 Century. First, how successfully have the new adopters implemented their competition laws? Second, what factors account for the relative succ...
OBJECTIVE China's food production has increased 6-fold during the past half-century, thanks to increased yields resulting from the management intensification, accomplished through greater inputs of fertilizer, water, new crop strains, and other Green Revolution's technologies. Yet, changes in underlying quality of soils and their effects on yield increase remain to be determined. Here, we provi...
OBJECTIVE Dengue has been reportable in Cambodia since 1980. Virological surveillance began in 2000 and sentinel surveillance was established at six hospitals in 2001. Currently, national surveillance comprises passive and active data collection and reporting on hospitalized children aged 0-15 years. This report summarizes surveillance data collected since 1980. METHODS Crude data for 1980-20...
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