Divide the hazard ratio for bilirubin by its standard error in Table 6.4 and compare the result to the listed value of z. Also compute a CI for this hazard ratio by adding and subtracting 1.96 times...

Divide the hazard ratio for bilirubin by its standard error in Table 6.4 and compare the result to the listed value of z. Also compute a CI for this hazard ratio by adding and subtracting 1.96 times its standard error from the hazard ratio estimate. Are the results very different from the CI listed in the output, which is based on computations on the coefficient scale?