What are the limitations of studying less common multiple births?

Mar 4, 2020 ... The twin birth rate rose 76 percent from 1980 through 2009, from 18.9 to 33.3. As of 2003, there are on average around 16 sets of twins born per ... Aug 4, 2022 ... The proportion of different-sex twins both presenting with GD (37%) was higher than that in same-sex twins (0%, Fisher's exact test p-value < ... Oct 1, 2015 ... Left-handedness is more likely to occur in twins than in single individuals. Only about 10% of people in the general population are left-handed. Feb 1, 2021 ... A new chart she calls a “Proportion Plot” which “help us compare the share of a population between two metrics. Oct 12, 2009 ... While they represent just 2 percent of the general population, twins make up 7.4 percent of the nation's cerebral palsy sufferers. Twins ... Aug 18, 2016 ... The twin boom. The proportion of twins in the population has waxed and waned in human history. For the first time we understand why. by Laura ... Apr 1, 2004 ... If, instead, people tend to choose mates like themselves, then fraternal twins could share more than 50 percent of their genes--and hence more ... Nov 5, 2013 ... Fraternal twins, on the other hand—people ... 10 percent of the population at large, and a whopping 80 percent of schizophrenics smoke. Nov 13, 2022 ... To study the risk of spontaneous preterm birth in twin pregnancies compared with singleton pregnancies. Design. Population-based registry study. May 6, 2022 ... That's an average of 32.1 per 1,000 live births. This number includes naturally occurring multiples and women who went through fertility ...