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A Practical Approach, Second Edition=Ronald D. Ho.pdf

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CHAPTER 17Statistical Analysis for Developmental andReproductive ToxicologistsJames J. ChenCONTENTSI. Introduction ........................................................................................................................697II. Analysis of Continuous Response Data ............................................................................699A. Litter-Based ANOVA Method ...................................................................................699B. Linear Mixed-Effects Models....................................................................................700C. Example-Fetal Body Weight Data.............................................................................700III.Analysis of Binary Response Data....................................................................................701A. Independent Binary Response Data ..........................................................................701B. Correlated Binary Response Data .............................................................................7031. Litter-Based ANOVA Method .............................................................................7032. Likelihood and Quasi-Likelihood <strong>Approach</strong>es ...................................................7033. Example — Hydroxyurea Data...........................................................................704IV. Analysis of Count Data .....................................................................................................705A. Likelihood and Quasi-likelihood Methods................................................................706B. Example .....................................................................................................................706V. Quantitative Risk Assessment and Benchmark Dose........................................................707A. Dose-Response Model and Benchmark Dose...........................................................707B. Example .....................................................................................................................709VI. Discussion ..........................................................................................................................709References ......................................................................................................................................710I. INTRODUCTIONReproductive and developmental toxicity experiments are conducted in laboratory animals for theevaluation of potential adverse effects of chemical compounds on fertility, reproduction, and fetaldevelopment. Depending on the study design, a test compound is administered to either parentprior to conception, to the female during gestation, or postnatally. Various reproductive and developmentalendpoints are measured, recorded, and analyzed. These endpoints can be divided intotwo categories: (1) parental and (2) embryonic or fetal endpoints. Parental endpoints used to assessreproductive effects include: body weight and weight gain, mating index, fertility index, changes697© 2006 by Taylor & Francis Group, LLC

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