Do twins experience more social anxiety or other psychological issues?

Dec 8, 2011 ... The proportion of people who can roll their tongue ranges from 65 to 81 percent, with a slightly higher proportion of tongue-rollers in females ... Aug 15, 2016 ... ... percent. “Some ... Already, babies born through in vitro fertilization are more likely to be identical twins than the population at large. Mar 14, 2017 ... That is a concerning percentage, especially when compared to the natural occurrence rate of 2% in the general population. The main reason ... ... proportion of provided data. Analysis. We defined the outcome in our analyses ... We based our analyses on data from a population-based twin sample of ... Dec 17, 1991 ... ... twins, compared with 11 percent of genetically unrelated brothers," said J. ... twins in the general population. Gregory Carey, an assistant ... A larger proportion of the twins. Discussion. This is the first population-based twin-study estimating the heritability of BPD by using an updated statistical ... Nov 13, 2022 ... To study the risk of spontaneous preterm birth in twin pregnancies compared with singleton pregnancies. Design. Population-based registry study. Oct 11, 2011 ... The major exception are the Caribbean Islands, where many people of African descent live — for instance, Haiti had 14 twins per 1,000 births. 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 ... Dec 11, 2006 ... ... population of twins and siblings and a broad survey of genetic markers. ... percent for men and 60 percent for women in this population.