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The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
The twins appeared on the television series Real People as motivational speakers, and then went on to play landlords in the 1981 television series Foul Play. [2] They also hosted a short-lived game show titled That Awful Quiz Show in 1982. [1] In 1989, the twins appeared in commercials for a chain of pizza restaurants known as Pizza Factory. [3]
The Hayes also have two sets of twins, Kevin and Kyle (eight years old at the time of the sextuplets' birth) and Kieran and Meghan (five years old). They are the only family in the United States to have two sets of twins and a set of sextuplets. [93] The family was the subject of a reality television show, Table for 12, on TLC in the U.S. [94]
This rate is unusual, exceeding the highest observed national twinning rate (4.5 to 5% for southwestern Nigeria [5]). Nearly half (8 of 17) of twins examined in one study were monozygotic (identical) twins, a few more than the average of 30%. [ 4 ]
Neonatal mortality rate: Number of child deaths within the first 28 days of life divided by total number of births. [9] Infant mortality rate: Number of child deaths within the first 12 months of life divided by total number of births. [9] Under 5 mortality rates: Number of child deaths within the 5th birthday divided by total number of births. [9]
During embryonic development, twins can form from the splitting of a single embryo (monozygotic) which forms identical twins or the twins can arise from separate oocytes in the same menstrual cycle which forms fraternal twins. Although the latter is more frequent, monozygotic is the reason conjoined twins can develop.
The use of twins can improve the statistical power of a genetic study by reducing the amount of genetic and/or environmental variability. [1] " Identical twins" (monozygotic (MZ) twins) share virtually all their genes with each other, and "fraternal twins" (dizygotic (DZ) twins), on average, share about 50% of their genes with each other (about the same amount of sharing as non-twin siblings).
In 2016, the WHO recorded 56.7 million deaths [3] with the leading cause of death as cardiovascular disease causing more than 17 million deaths (about 31% of the total) as shown in the chart to the side. In 2021, there were approx. 68 million deaths worldwide, as per WHO report.