Abstract
This reply addresses Blanchard’s (2007) conclusion that the reduced samples size in some of our comparisons of the Fraternal Birth Order (FBO) theory lacked the power to detect the small expected mean difference in number of older brothers minus number of younger brothers for homo-erotic versus hetero-erotic group comparisons. Further analyses reported here indicated that this was not the case. We stressed the importance of examining distribution of parturient mothers’ ages in studying the FBO theory and not relying on assumptions based on probands or relying on mean ratios, such as the Live Birth Ratio, which can distort results.
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