I have some doubts while doing this question. I tried out parts (a) - (c) and am quite confused by (d). Would appreciate if someone can help to check my work to see if I have done it correctly, thank you.
a) Model becomes ln(hazard) = -0.54128
Hazard ratio = exp(-0.54128) = 0.582
b) Model becomes ln(hazard) = 1.40685 + (-0.54128) - 1.6296 = -0.76403 Hazard ratio = exp(-0.76403) = 0.465
c) p = 0.0168 < 0.05. Hence there is a significant difference in treatment effect for men and women at 5% level of significance.
d) Do I find the calculation for men or women patients?