PubMed · 83505
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
J D Erickson, T Bjerkedal. 1979-01-06. Interval between pregnancies.. https://doi.org/10.1016/s0140-6736(79)90502-6
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
The effects of birth order, presentation and method of delivery on neonatal mortality and neurodevelopmental outcome in nondiscordant low birthweight ( < 2500 g) twin gestations were evaluated. Sixty-four sets of twins were included in the study; 29 sets were in vertex/vertex presentation (Group I), 25 sets in vertex/breech (Group II) and in 10 pregnancies the first twin was nonvertex (Group III). The rate of favorable neonatal outcome (survival and normal neurodevelopmental outcome after a 2-year follow-up) was lower in pregnancies in which at least one twin was in nonvertex presentation (50/70 vs. 52/58 P = 0.02). However, after adjustment by multiple logistic regression analysis for the effects of gestational age, birthweight, birth order and educational level of the mother, this difference was not statistically significant (odds ratio = 0.6; 95% confidence interval 0.44 to 5.9; P = 0.5). In pregnancies in which at least one of the twins was in nonvertex presentation, delivery by cesarean section did not affect the rate of favorable neonatal outcome (odds ratio = 1.8; 95% confidence interval 0.48 to 12.9; P = 0.8). The results of this study suggest that in low birthweight twin gestations, method of delivery in relation to fetal presentation has little or no effect on neonatal mortality and subsequent neonatal neurodevelopmental outcome.
Twinning rates in all of Japan for 1951-1968 and 1974-1990 were analyzed using data from vital statistics of Japan. The twinning rate per 1,000 births was 6.43 in 1951 and remained nearly constant until 1968, then decreased to 5.79 in 1974 and gradually increased to 7.00 in 1990. The MZ twinning rate increased slightly up to 1966, but decreased thereafter, whereas the DZ rate declined over the entire period. As for maternal age, the DZ rate increased up to the age group 35-39 and decreased thereafter. The same tendency is seen in the MZ rate, but the maternal age effect is less marked than in DZ twins. The same tendency is also seen in the overall rate for 1975-1985. As for geographical variations, the MZ and DZ rates were computed in each prefecture for 1955-1959 and in 1974. The DZ rate increased from a low level in the southwest Japan to a high level in the northeast for both periods, whereas the MZ rate was rather constant in 1974 throughout Japan. As for seasonal variation, the highest rates per 1,000 births for MZ(4.56) and DZ(2.20) twins were seen in April, with the lowest rate in September (3.69) for MZ twins and in July (1.71) for DZ twins.
The predictive power of height for future ischaemic heart disease (IHD) was examined in 4860 men from two communities in South Wales and the West of England. At follow-up, men in the shortest fifth of the height distribution had experienced twice as many incident IHD events (fatal and non-fatal myocardial infarction) as was the case for men from the tallest fifth. Adjustment for age, social class and smoking habit failed to alter these relationships significantly. In the data from South Wales, determinants of height were examined; birth rank and number of siblings showed a trend with height. This trend was found only in men whose fathers were manual workers and may be related to inadequate nutrition in the higher birth ranks and larger families. These results support the suggestion that early childhood factors may be relevant to IHD in middle age and possible mechanisms are discussed.