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1987年3月～1988年4月对全省3市、15县进行了1986年婴儿死亡回顾调查,共29551人,其中城市9682人,农村19869人。 调查对象与方法 按分层随机抽样法,抽取相当于每年出生1000名婴儿的区域,从1986年1月1日零时至1986年12月31日24时所出生及死亡者为调查对象。
From March 1987 to April 1988, a retrospective survey of infant deaths in 1986 and 1986 was conducted in 3 cities and 15 counties in the province, totaling 29,551 people, including 9,682 in urban areas and 19,869 in rural areas. Subjects and Methods According to the stratified random sampling method, the area corresponding to 1000 babies born each year was sampled from birth and death from 0:00 on January 1, 1986 to 24:00 on December 31, 1986.