OBJECTIVES To provide information on twin deliveries among Igbos in a rural/semi-urban community of South-Eastern Nigeria, and compare the twinning rate with data from the other two major tribes. METHODS An analysis of the records of deliveries conducted over a 20-year period in a rural/semi-urban community of South-Eastern Nigeria. RESULTS The twinning rate of the community was 1:24, and i...

OBJECTIVE To determine whether education level and occupation are risk factors of vaginitis in pregnant women and to investigate relationship between vaginitis occurrence during pregnancy and perinatal mortality rates. METHODS A total of 319 women of early pregnancy or mid-pregnancy were enrolled. Six specimens were collected from posterior fornix of each pregnant woman and then cultured for ...

BACKGROUND Using spatial analysis tools to determine the spatial patterns of China province-level perinatal mortality and using spatial econometric model to examine the impacts of health care resources and different socio-economic factors on perinatal mortality. METHODS The Global Moran's I index is used to examine whether the spatial autocorrelation exists in selected regions and Moran's I s...

This study investigates trends in perinatal mortality rates in Fukushima Prefecture and four neighboring prefectures (Miyagi, Gunma, Tochigi, and Ibaraki) before and after the Fukushima nuclear disaster in March 2011. Beginning in 2012, perinatal mortality rates deviate upwards from the trend in preceding years; the monthly data show significant peaks in May 2012 and March 2013. It is unlikely ...

We argue theoretically and document empirically that aging leads to greater (industrial) automation, and in particular, to more intensive use and development of robots. Using US data, we document that robots substitute for middle-aged workers (those between the ages of 36 and 55). We then show that demographic change—corresponding to an increasing ratio of older to middle-aged workers—is associ...

The unusual properties of transition objects (young stars with an optically thin inner disc surrounded by an optically thick outer disc) suggest that significant disc evolution has occured in these systems. We explore the nature of these systems by examining their demographics, specifically their stellar accretion rates Ṁ∗ and disc masses Mdisc compared to those of accreting T Tauri stars of co...