International Journal of Epidemiology, Volume 33, Number 1, pp. 114-115
IJE vol.33 no.1 © International Epidemiological Association 2004; all rights reserved.
Special Theme: Perinatal and early-life influences on disease |
Commentary: Ethnic differences in gestational age exist, but are they normal?
Department of Epidemiology, CB #7435, University of North Carolina School of Public Health, Chapel Hill, NC 27599-7435, USA. E-mail: david_savitz@unc.edu
| The first 10% of the full text of this article appears below. |
Research on preterm birth and low birthweight has been successful at two levelsthe broad, social level, where international, socioeconomic, and racial/ethnic differences are clear, and at the mechanistic, clinical level, where pregnancy complications, prior adverse outcomes, and certain pre-existing chronic diseases are strongly related to adverse pregnancy outcome. Research on everything in between, i.e. the more readily modifiable behaviours or health services, has been less successful with the exception of cigarette smoking and reduced birthweight. Despite intensive effort, research on diet, stress, physical activity, environmental pollutants, and prenatal care has not taught us a great deal about