How do historical records indicate the occurrence of twins?

Oct 15, 2011 ... The number is on the rise, however, as a consequence of the rising percentage of so-called mixed race people in the British population. In rheumatoid arthritis patients of European ancestry, as many as 60–70% carry the HLA-DR4 gene, compared with 30% in the general population. Twin studies ... Oct 14, 2022 ... There is no proven scientific explanation for the high rate of twins in Igbo-Ora, a city of at least 200,000 people 135 kilometers (83 miles) ... Aug 18, 2016 ... That difference is about 6 percentage points, meaning that if out of 100 boys in the general population, 84 were still alive at age 45, then for ... Apr 17, 2014 ... The rate surpassed 3 percent in 2001 and hit 3.3 percent in 2010. Now, one out of every 30 babies born is a twin. That's a lot of "extra ... Feb 25, 2019 ... ... percent to 66 percent of the identical twins also will be gay. As this is much higher than the overall rate in the population, this suggests ... Mar 11, 2021 ... One in every 42 children is born a twin and much has changed over the past 30 years, a report finds. Jan 1, 2006 ... The proportion of population risk in major depression attributable to genetic factors appears to be moderately greater in women than in men. Dec 11, 2024 ... In the general population, identical twins occur in only 0.4% (4 ... Over 60 percent of twins and nearly all higher-order multiples are ... ... what percentage of their cause is due to genes. To do this we find people with the disease who have a twin, and then find out whether the twin is also ill.