Articles: mortality.
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Perinatal epidemiologists no longer speak much of "prematurity". Instead the World Health Organization recommends that infants born before 37 completed weeks of gestation should be designated "preterm" and those of birthweight less than 2500 g "low birthweight". Both definitions have obvious drawbacks--the former because menstrual dates are often unknown or unreliable, the latter because it does not separate preterm from small-for-gestational-age infants. Whatever the classification of these small infants there is no dispute about their high mortality and morbidity; in the United Kingdom they account for over two-thirds of first-week deaths.
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The outcome of pregnancy of all women belonging to the study population of the Machakos project studies who delivered during 1975 and 1976 is presented. The birth-rate was 43.0 per 1,000 population per year, the fertility rate was 235 per 1,000 women 15--44 years of age per year. Unexpected low mortality rates were found; stillbirths, neonatal and infant death rates were respectively 29.8 per 1,000 total births and 22.5 and 50.0 per 1,000 live births. ⋯ Parity, marital status, birth-interval and maternal height were not associated with a difference in outcome of pregnancy. The stillbirth rate among the children born in hospital (26.4%) was 4.4% compared with 2.4% among the children born at home, neonatal and infant death rates were the same. Half of all perinatal deaths were caused by either prematurity or birth trauma, 75% of all infant deaths after the first week of life were caused by infections.
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The protective value of legislation for compulsory wearing of seat belts has been supported by Australian and overseas experience. An evaluation of changes during the period from 1957 to 1977 in the incidence of road crash fatalities for male and female vehicle occupants in Victoria and the rest of Australia (that is, in Australia minus Victoria) is presented. ⋯ There has been virtually no reduction in road crash fatalities for passengers less than 17 years of age. Hypotheses are advanced to explain these findings and further countermeasures are suggested.
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In spite of great strides in obstetrics, maternal mortality has been completely eliminated. Possible changes in the causes of mortality are examined for three periods of time (1954-1961, 1962-1971 and 1972-1976). The overall incidence was 3.6/10 000, changing through the three periods from 4.9 to 4.3 and finally to 3.0/10 000. ⋯ Cesarean section was involved in ten of 23 cases in which the death was directly related to the pregnancy and delivery. In six patients there was a rupture of the uterus. The number of preventable deaths has decreased steady, but research into the problem of vascular accidents and dampening of the enthusiasm for cesarean sections may further improve the situation.