low birth weight: methodological assessment and meta-analysis. Bull WHO 65:663-737. Kramer MS. 2003. The epidemiology of adverse pregnancy outcomes: an overview. J Nutr 133:1592S-1596S. Lang JM, Lieberman E, Cohen A. 1996. A comparison of risk factors for preterm labor and term small-for-gestationalage birth. Epidemiology 7:369-376. Liu K. 1988. Measurement error and its impact on partial correlation and multiple linear regression analysis. Am J Epidemiol 127:864-874. REFERENCES Ashby J, Lefevre PA, Tinwell H, Odum J, Owens W. 2004. Testosterone-stimulated weanling rats as a replacement for castrated rats in the Hershberger anti-androgen assay. Regul Toxicol Pharmacol 39:229-238. Ashby J, Owens W, Deghenghi R, Odum J. 2002a. Concept evaluation: an assay for receptor-mediated and biochemical antiestrogens using pubertal rats. Regul Toxicol Pharmacol 35:393-397. Ashby J, Owens W, Lefevre PA. 2002b. Concept evaluation: androgen-stimulated immature intact male rats as an assay for antiandrogens. Regul Toxicol Pharmacol 35:280-285.