Environmental temperature and death-rate from intestinal neoplasms.
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In England, Wales, and Scotland there is a strong association between mortality-rates and ABO blood-group distribution. It is suggested that some of the discrepancies in investigations of the relation between water hardness and mortality-rates from cardiovascular disease may be attributed to genetic influences.
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Examination of data from 141 countries showed that infant mortality rates for 1979 were positively correlated with the proportion of gross national product devoted to military spending (r = 0.23, p less than 0.01) and negatively correlated with indicators of economic development, health resources, and social spending. In a multivariate analysis controlling for per caput gross national product, arms spending remained a significant positive predictor of infant mortality rate (p less than 0.0001), while the proportion of the population with access to clean water, the number of teachers per head, and caloric consumption per head were negative predictors. The multivariate model accounted for much of the observed variance in infant mortality rate (R2 = 0.78, p less than 0.0001), and showed good fit to similar data for the year 1972 (R2 = 0.80, p less than 0.0001). The model was also predictive of infant mortality rates in subgroup analysis of underdeveloped, middle developed, and developed nations. Analysis of time trends confirmed that an increase in military spending presages a poor record of improvement in infant mortality rate. These findings support the hypothesis that arms spending is causally related to infant mortality.
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Ageing is an increase in mortality and/or decline in fertility with advancing age. Evolutionary theories predict that ageing will evolve in response to the pattern of externally imposed hazards to survival and fertility; a prediction confirmed in new empirical studies. Recent studies of large cohorts of experimental animals and of humans have revealed that mortality rates do not continue to accelerate at very advanced ages. It has been suggested that evolutionary theories cannot account for these mortality patterns; however, this challenge is more apparent than real. Heterogeneity between individuals can shape mortality trajectories for populations, and recent evolutionary theory can both account for such heterogeneity and accommodate late-age mortality patterns.
This article outlines a community-based retrospective study in a remote area of Nepal and describes local birth practices and their impact on infant mortality. Data collection was carried out in two steps, a household survey from September to October 1996 and a qualitative research phase. Data collected include socio-economic background, reproductive history, birth practices and child survival. Among 3007 live-born children, 660 (22%) died before their first birthday. In keeping with local customs, approximately half of the children were delivered in an animal shed and the other half in the home. Children born in an animal shed were at significantly higher risk of dying than were those born in the home even after adjusting for socio-economic status and biological variables. The association was stronger in the neonatal period (OR = 2.8, 95% CI 1.9-4.1) than during the post-neonatal period (OR= 1.3, 95% CI 1.02-1.6). The preparation of the delivery place was inadequate and thereby facilitated infection of both the newborn and the mother. Traditional norms and animal-shed delivery practices are common in the Jumla community. The reasons addressed for giving birth in the animal shed included (1) Household Deity's anger if delivery takes place in the home and (2) easy to clean the shed following the birth.
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