Term Paper on "Teratogens Hazardous to the Baby's Health Alcohol Cocaine Cigarette Smoking"
Term Paper 3 pages (1072 words) Sources: 5
[EXCERPT] . . . .
Teratology, from the Greek word "tera" meaning monster, refers to the study of birth defects and their etiology. Statistical analysis of data from teratology studies is complicated by the multiplicity of outcomes that are typically assessed. Indeed, few human teratogens cause a single, uniquely defined defect, but most induce a variety of adverse effects, including major malformations, minor anomalies, and deficiencies in birth weight, length, and head circumference. Sometimes, a particular configuration of effects will be grouped together and identified as a "syndrome." (Legler & Ryan, 1997)Human teratogens often manifest themselves through a broad spectrum of adverse effects. Although often not serious when considered individually, such outcomes taken together may represent a syndrome that can lead to serious developmental problems. Accordingly, studies that investigate the effect of human teratogens on fetal development typically record the presence or absence of a multitude of abnormalities, resulting in the data of multivariate binary form for each infant. Such studies typically have three objectives: (1) estimate an overall effect of exposure across outcomes, (2) identify subjects having the syndrome, and (3) identify those outcomes that constitute the syndrome so that doctors know what to look for when diagnosing the syndrome in other exposed newborns. This article proposes the use of a logistic regression model with crossed random effect structure to address all three questions simultaneously. (Coull, Hobert, Ryan & Holmes, 2001)
SUMMARY
During the entire life span of each individual, the most dramatic changes take place during the embr
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Teratogens have been a cause for concern dating back to the early 60's. Among these were thalidomide, rubella ("German" measles), and nicotine (Golden, 1999), retinoids and valproic acid affecting gene/gene, gene/receptor, gene/modifier, and gene/teratogen interactions that lead in neural tube or other structural defects ("Developmental Mechanisms of Human Structural Birth Defects," 2004). Cocaine, which is easily affordable and obtainable in the form of crack, readily crosses the placenta. The incidence of cocaine use by women of childbearing age has been reported to be about 15% and estimates ranged from 10% to 30% of women using during pregnancy in urban centers. Other drugs i.e. alcohol, cigarettes, and marijuana, are frequently used during pregnancy, often in conjunction with cocaine. Ample evidence supports the long-term developmental consequences of these prenatal exposures. Moreover, combinations of… READ MORE
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