Birthweight ratio.

Birthweight ratio revisited.

In order to test the hypothesis suggested in a recent report that the birthweight ratio might be a useful predictor of several important clinical outcome measures in babies of less than 31 weeks' gestation, we examined the association between the birthweight ratio and aspects of both short and long term outcome in 436 Leeds babies of less than 31 weeks' gestation. Unlike the report, and contrar...

Birthweight ratio and outcome in preterm infants.

The association between birthweight ratio and outcome was investigated in 429 infants born before 31 weeks' gestation. Birthweight ratio was calculated in each case as birth weight divided by mean birth weight for gestation (from reference data). It was shown that a given ratio corresponded to the same birth centile across the gestational age range studied; a ratio of 0.8 corresponding to the 1...

Paternal age, placental weight and placental to birthweight ratio: a population-based study of 590,835 pregnancies.

STUDY QUESTION Is the age of the father associated with placental weight or the ratio of placental weight to birthweight? SUMMARY ANSWER Placental weight and placental to birthweight ratio increased according to increasing paternal age, also after adjustment for maternal age. WHAT IS KNOWN ALREADY High paternal age and also high placental to birthweight ratio have been associated with adver...

Selective migration by birthweight.

Returns to Birthweight

We use data on monozygotic twins to obtain improved estimates of the effect of intrauterine nutrient intake on adult health and earnings and thus to evaluate the efŽ cacy of programs aimed at increasing birthweight. We use the results to evaluate the bias in cross-sectional estimates and to assess the proposition that health conditions play a major role in determining the world distribution of ...