Hepatitis B and the case of the missing women

• 成果类型: Article
• 署名作者: Oster, E
• 署名单位: Harvard University
• 刊物名称: JOURNAL OF POLITICAL ECONOMY
• ISSN/ISSBN: 0022-3808
• DOI: 10.1086/498588
• 发表日期: 2005
• 页码: 1163-1216
• 关键词: HUMAN SEX-RATIO; virus-infection; AUSTRALIA-ANTIGEN; mortality; marriage; HEALTH; population; PREVALENCE; immigrants; nutrition

摘要

In many Asian countries the ratio of male to female population is higher than in the West: as high as 1.07 in China and India, and even higher in Pakistan. A number of authors ( most notably Amartya Sen) have suggested that this imbalance reflects excess female mortality and have argued that as many as 100 million women are missing. This paper proposes an explanation for some of the observed over-representation of men: the hepatitis B virus. I present new evidence, consistent with an existing scientific literature, that carriers of the hepatitis B virus have offspring sex ratios around 1.50 boys for each girl. This evidence includes both cross-country analyses and a natural experiment based on recent vaccination campaigns. Hepatitis B is common in many Asian countries, especially China, where some 10 15 percent of the population is infected. Using data on prevalence of the virus by country and estimates of the effect of hepatitis on the sex ratio, I argue that hepatitis B can account for about 45 percent of the missing women: around 75 percent in China, between 20 and 50 percent in Egypt and western Asia, and under 20 percent in India, Bangladesh, Pakistan, and Nepal.