The Journal of Toxicological Sciences
Online ISSN : 1880-3989
Print ISSN : 0388-1350
ISSN-L : 0388-1350
Regular paper
ANALYSIS OF QUANTITATIVE DATA OBTAINED FROM TOXICITY STUDIES SHOWING NON-NORMAL DISTRIBUTION
Katsumi KOBAYASHI
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JOURNALS FREE ACCESS

2005 Volume 30 Issue 2 Pages 127-134

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Abstract

The data obtained from toxicity studies are examined for homogeneity of variance, but, usually, they are not examined for normal distribution. In this study I examined the measured items of a carcinogenicity/chronic toxicity study with rats for both homogeneity of variance and normal distribution. It was observed that a lot of hematology and biochemistry items showed non-normal distribution. For testing normal distribution of the data obtained from toxicity studies, the data of the concurrent control group may be examined, and for the data that show a non-normal distribution, non-parametric tests with robustness may be applied.

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© 2005 The Japanese Society of Toxicology
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