The twinning rate — the number of twin births per 1,000 deliveries — shows how common twin pregnancies are. This information is important for both medical and demographic reasons.

Medically, twin pregnancies carry higher risks for both the mother and babies compared to single pregnancies, and knowing the twinning rate helps public health systems prepare for these higher-risk cases. Demographically, twinning rates provide important insights into fertility patterns, changes in the age at which women are having children, and the use of fertility treatments.

Till now, most studies on twinning rates have focused on high-income countries; much less is known about the situation in low-income settings. This is exactly the gap a recent study by researchers from Max Planck Institute for Demogr

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