New York City birth certificates for singletons born from September 1-December 31, 1981 (N = 36,056) were analyzed using multivariate regression techniques. The effects of maternal age and parity on birthweight were assessed. There was a significant progression of birthweight with advancing age. Birthweight similarly increased from parity 1 to parity 3, but dropped markedly in the higher parity groups. On stratification by gestational age, we found that age and parity influence birthweight by affecting fetal growth rather than the length of pregnancy.

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The CS rate in Queensland in 2006 was higher than in any other Australian state. The increase in Queensland's CS rates can be attributed to both the rising number of primary caesarean births and the rising number of repeat caesareans.

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We report the frequency of parasitic infections 1971-84 in a major New York City Medical Center whose catchment area includes many immigrants from Dominican Republic. Infection with 7,$03 parasites was documented in 41,958 laboratory specimens. Trends were toward fewer total specimens being sent and fewer still being positive, although a rise in G. lamblia, E.