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Maternal depression can be accounted for one of the most common complications during pregnancy and the postpartum period affecting women all over the world. So far, no detailed map of the worldwide maternal depression research architecture has been constructed, which encompasses aspects of research activity, quality, and also socioeconomic features. Using the NewQIS platform, density-equalizing mapping projections, scientometric techniques, and economic benchmarking procedures were applied to evaluate global maternal depression research for the period between 1900 and 2012. In total, 7330 related publications and 3335 international collaborations were identified. The USA was the most active country concerning collaborations and total research activity. In the socioeconomic analysis of research activity in high-income countries, Australia was ranked first with an average of 412.05 maternal depression-related publications per 1000 billion US$ GDP (Q), followed by the UK (Q = 373.51) and Canada (Q = 306.32). The group of upper-middle-income countries was led by South Africa (Q = 145.67), followed by Turkey (Q = 91.8). China authored 11.95 maternal depression-related publications per 1000 billion US$ GDP. The USA had the highest activity of maternal depression research per GDP in billion US$ per capita (Q = 60.86). When research activity was related to population size (Q = publications per Mio. inhabitants), Australia (Q = 26.44) was leading the field, followed by Norway (Q = 18.48). Gender analysis revealed a relatively high degree of female scientists involved in this field of research with pronounced differences between single subject areas. In summary, we here present the first picture of the global scientific development in maternal depression research over a period of more than 100 years. The research landscape is clearly dominated by North American and Western European countries, with only minor contribution of Asian or South American countries. [ABSTRACT FROM AUTHOR]

Background: The Seven Countries Study in the 1960s showed very low mortality from coronary heart disease (CHD) in Japan, which was attributed to very low levels of total cholesterol. Studies of migrant Japanese to the USA in the 1970s documented increase in CHD rates, thus CHD mortality in Japan was expected to increase as their lifestyle became Westernized, yet CHD mortality has continued to decline since 1970. This study describes trends in CHD mortality and its risk factors since 1980 in Japan, contrasting those in other selected developed countries.Methods: We selected Australia, Canada, France, Japan, Spain, Sweden, the UK and the USA. CHD mortality between 1980 and 2007 was obtained from WHO Statistical Information System. National data on traditional risk factors during the same period were obtained from literature and national surveys.Results: Age-adjusted CHD mortality continuously declined between 1980 and 2007 in all these countries. The decline was accompanied by a constant fall in total cholesterol except Japan where total cholesterol continuously rose. In the birth cohort of individuals currently aged 50-69 years, levels of total cholesterol have been higher in Japan than in the USA, yet CHD mortality in Japan remained the lowest: >67% lower in men and > 75% lower in women compared with the USA. The direction and magnitude of changes in other risk factors were generally similar between Japan and the other countries.Conclusions: Decline in CHD mortality despite a continuous rise in total cholesterol is unique. The observation may suggest some protective factors unique to Japanese. [ABSTRACT FROM AUTHOR]