Question 44.

43 1 point Histologic stage is an ordinal categorical variable coded as 1-4 (higher values meaning more advanced progression of disease). Suppose this is initially modeled as a semi continuous variable in a Cox regression, resulting in the following model: In(hazard of mortaility at time t x)-In().(t)) + 0.8211, where x, =1 to 4 for the four histologic stage levels. The standard error of the slope for x ( SE(B, ) ) is 0.12. - Based on theses results, what is the estimated hazard ratio of death for patients with a histologic stage of 4 compared to patients with a histologic stage of 1? a. 2.26 b. 6.78 C. 11.50 44. 1 point Histologic stage is an ordinal categorical variable coded as 1-4 (higher values meaning more advanced progression of disease). Suppose this is initially modeled as a semi continuous variable in a Cox regression, resulting in the following model: In(hazard of mortaility at time t x)- In().(t)) + 0.8211, where x, =1 to 4 for the four histologic stage levels. The standard error of the slope for x ( SE(B, ) ) is 0.12 - What is the 95% CI for the hazard ratio from question 43? a. (1.80, 2.90) b. (-2.90, -1.90) C. (0.04, 0.18) d. (5.7, 24.1)