To the Editor: We appreciate the interest of Dr. Robbins in our study of "Asthma and Steroid Therapy as Influences on Growth." We must admit, however, that we find it difficult to follow the arguments in his letter. The problems of separating the growth inhibiting effects of chronic asthma from those of the corticosteroids are clearly recognized and discussed in our report (page 135, paragraph 2). It seems to us that Dr. Robbins disregards the fact that we arc comparing "mean" growth rates, in order to evaluate the statistical significance of the observed differences. We believe that it has been satisfactorily demonstrated that both intractable asthma and steroid therapy contribute to the growth deficits seen among our patients.
There are, of course, exceptions, and the study of these exceptions may prove as important as the establishment of the rule. We have occasionally seen acceleration of growth following the introduction of