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6 resultsTwin births
Twin births The unprecedented increase in the twinning rate The frequency of twin births has significantly increased in developed countries, doubling since the 1970s (see Figure 1). Two main factors have contributed to this development, namely the rise in …Twin births
Twin births …Key points about the data
Key points about the data The Human Multiple Births Database (HMBD) provides the number and rate of twin deliveries for different countries. Statistics on other multiple births (i.e., triplets, quadruplets, etc.) are also provided whenever possible. …Data and metadata
Data and metadata HMBD (v.1) - last update: 26/05/2025 hmbd_pooled_data_26.05.2025.zip (zip - 140.65 KB) 11/08/2022: The variable Flag was removed in this data update, as we are currently replacing it by the variable Footnotes . These variables are …Citation and credits
Citation and credits Recommended citation All materials provided in this website are free to view, download and use, under the terms of Licence Creative Commons Attribution 4.0 International (CC BY 4.0) . Please cite the data as follows: Human Multiple …Studies on multiple births
Studies on multiple births The following list offers the references to selected studies on multiple births. Please note that this list is not exhaustive; it will be frequently updated. References Bae, Hyewon, 2025 , Trends in Multiple Births in Korea and …