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Distribution of advanced maternal age with the total number of live births nationwide, multiple births nationwide, and ART in Korea during 2006. An age over 35 years was considered advanced maternal age; woman of advanced maternal age accounted for 11.8% of total live births nationwide, 15.6% of multiple births nationwide, and 43.5% of ART during 2006 in Korea. Therefore, the proportion of women with advanced maternal age was very high in the ART group.
