Ginekologia polska · 2003
[Order of twins--random choice of natural selection?].
Аннотация на английскомСтатьяНазвание и аннотация: Перевод в очереди
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Malewski Zbyszko, Seremak-Mrozikiewicz Agnieszka, Drews Krzysztof
Аннотация
OBJECTIVE: Testing of hypothesis that the order of twins is random.
DESIGN: Confrontation of birthweight and incidence of stillbirth between twins.
MATERIALS AND METHODS: The group of 829 twin deliveries was investigated. Probability of distribution was assessed according to Bernoullie's trials schema.
RESULTS: The first twin was usually heavier then the second one (p = 0.05), especially at term. Order of twin delivery was influenced by a birthweight difference > 250 g. In cases of single twin intrauterine death, the alive, term baby was delivered as the first one statistically more common (p = 0.029), despite of smaller number of cases. Discussion suggests that differences between twins are rather reasons of observed order than results.
CONCLUSION: Hypothesis of natural selection of stronger baby for the first delivery was presented.
DESIGN: Confrontation of birthweight and incidence of stillbirth between twins.
MATERIALS AND METHODS: The group of 829 twin deliveries was investigated. Probability of distribution was assessed according to Bernoullie's trials schema.
RESULTS: The first twin was usually heavier then the second one (p = 0.05), especially at term. Order of twin delivery was influenced by a birthweight difference > 250 g. In cases of single twin intrauterine death, the alive, term baby was delivered as the first one statistically more common (p = 0.029), despite of smaller number of cases. Discussion suggests that differences between twins are rather reasons of observed order than results.
CONCLUSION: Hypothesis of natural selection of stronger baby for the first delivery was presented.