If available in your library, read the article, “Impact of Obesity on Allogeneic Stem Cell Transplant Patients: A Matched Case-Controlled Study,” by Donald R. Fleming et al. [American Journal of Medicine, 102 (1997), 265–268] and answer the following questions:

(a) How was survival time determined?

(b) Why do you think the authors used the Wilcoxon test (Breslow test) for comparing the survival curves?

(c) Explain the meaning of the p values reported for Figures 1 through 4.

(d) What specific statistical results allow the authors to arrive at their stated conclusion?