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1992年 1月～ 1 2月间 ,针对欧洲 5个国家的 40 35名妇女开展了一项横断面调查。以问卷询问研究对象与妊娠有关的问题。延迟受孕指经过 9个半月无任何避孕措施的性行为后才受孕。受孕时间以 9个半月作为临界值 ,将 BMI分成 4个等级 ( 2 0、2 0～ 2 4.9、2 5～ 2 9.9、≥ 30 kg
From January to February 1992, a cross-sectional survey of 40 35 women in five European countries was conducted. Questionnaires were used to inquire about pregnancy-related issues. Delayed pregnancy refers to after 9 and a half months without any contraceptive sex before pregnancy. Conception time at 9 and a half months as a critical value, the BMI was divided into four grades (20,2 0 ~ 29.5,25 ~ 29.9, ≥ 30 kg