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据世界卫生组织报导,全世界大约有10亿人(约占总人口数1/5)在不同时期患有各种不同类型的疾病。尽管全球每千人死亡数从1980年的10.8％降至1990年的9.5％,但这种死亡率的下降并不能反映出世界人口的健康状态有了明显的改善。据WHO测算因病致残人数,特别是老年病甚至还有所增加。WHO流行病学专家最近对50多种疾病的死亡情况和发病
According to the World Health Organization, about 1 billion people (about 1/5 of the total population) worldwide suffer from different types of diseases at different times. Although the number of deaths per 1,000 people dropped from 10.8% in 1980 to 9.5% in 1990, this decline in mortality does not reflect a significant improvement in the health status of the world’s population. According to the WHO, the number of people who are disabled due to illness, especially the elderly, has even increased. WHO epidemiologists recently reported on the deaths and morbidity of more than 50 diseases