How does maternal age affect the chances of having twins?

Association of low birth weight with cardiometabolic diseases in Swedish twins: a population-based cohort study ... proportion (AP) and the Synergy Index (S). Apr 23, 2025 ... As of 2023, the birth rate for twins in the U.S. was 30.7 per 1,000 live births. ... This percentage would increase if multiple birth rate per ... Nov 2, 2023 ... ... percentage of successful pregnancies at that age results in twins. ... twins is in the Asian population, and it's higher in the Black population. Dec 17, 1991 ... ... twins, compared with 11 percent of genetically unrelated brothers," said J. ... twins in the general population. Gregory Carey, an assistant ... Mar 15, 2023 ... Fraternal twins happen because some people release two eggs (or more) at a time. That's called superovulation. Advertisement. If two sperm ... Dec 25, 1986 ... This was a significantly higher proportion (chi-square = 6.11; P<0.025) than that of dizygotic twin pairs (14 of 43; 32.6 percent) recog- nized ... Apr 24, 2023 ... No, the likelihood of having twins varies across different regions and populations. According to the World Health Organization (WHO), the global ... Dec 7, 2022 ... † Percent change between years was statistically significant; p < 0.05. NOTE: Twin birth rate is the number of twins per 1,000 total births. Jan 9, 2023 ... The proportion of identical twins is the same everywhere in the ... population in the United States was until recently much higher than ... ... twins extracted from the entire student population enrolled between 2011 and 2021 at an Italian university. ... percentage points and improves university ...