1. Suppose a serum-creatinine level of ≥1.5 mg/dL is considered a sign of possible kidney toxicity. Use survivalanalysis methods to assess whether there are differences in the incidence of kidney toxicity between the high-N-acetylp- aminophenol (NAPAP) group and the control group. In this analysis, exclude subjects who were ≥1.5 mg/dL at baseline. 

2. Answer Problem 14.27 comparing the low-NAPAP group with the control group?