Jing-xu Zhang

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OBJECTIVES To describe birth-weight-for-gestational-age patterns by race, sex, and parity in the United States population, and to discuss the measurements of gestational age by different methods, the pitfalls of each method, and the potential effects of the errors on birth-weight-for-gestational-age curves. METHODS We used the computerized certificates of(More)
BACKGROUND Vaginal intraepithelial neoplasia (VAIN), as a precursor of vaginal cancer, is a rare disease. Its prevalence has not been well analyzed. This research is to ascertain the risk factors for VAIN in a Chinese population. METHODS A case-control study was conducted, including 63 VAIN cases and 64 healthy controls. In all subjects Pap smear and HPV(More)
We examined the association between physical activity and bone mineral density (BMD) among 352 perimenopausal women. A personal activity computer was used to estimate the daily energy expenditure on physical activity. BMD was measured by photon absorptiometry at the lumbar spine, midradius, and distal radius. Multiple linear regression, controlling for(More)
The Baltimore-Washington Infant Study, a case-control study of congenital heart defects in liveborn infants conducted in 1981--1989, interviewed parents about a wide range of environmental exposures that occurred during and before the pregnancy. In the period 1987--1989, the questionnaire was expanded to include a detailed inquiry about exposures to(More)
BACKGROUND The present study examined the relation between fish consumption and mortality from all causes, ischemic heart disease, and stroke. METHODS The fish consumption data in 1961-1963, 1979-1981, and 1989-1991 and mortality data, age-standardized to 45-74 years, mean of the latest available 3 years, mostly around 1992-1993, in 36 countries, were(More)
OBJECTIVE To evaluate the status of mothers' knowledge, attitudes and practices (KAP) and its related factors and provide evidences for further effective implementation on childhood immunization in Guizhou Province. METHODS This study was a cross-sectional study, in which 591 mothers of children under 2 years were surveyed with structured questionnaires(More)
OBJECTIVE To examine the effect of mode of delivery on twin survival, especially among very premature twin births, in a population-based historical cohort study. METHODS A total of 4428 pairs of live-born twins, birth weight 500 g or greater, were included based on data from vital records of the entire state of North Carolina for the period 1988-1991. The(More)
AIM To clarify the determinants of resting heart rate at the population level in a random sample of the Belgian population. METHODS AND RESULTS Data of 5027 men and 4150 women aged 25-74 years obtained from a Belgian nationwide survey were analysed. In multivariate analysis, blood pressure strongly correlated with heart rate in men (t = 12.4 for systolic;(More)
BACKGROUND A striking difference in fish consumption and lung cancer mortality (LCM) exists among populations worldwide. This study investigated the relation between fish consumption and LCM at the population level. METHODS Sex-specific LCM data, mostly around 1993 and fish consumption data for 10 periods 1961-1994 in 36 countries were obtained from WHO(More)