[R] What does exp(-coef) mean?

[Anniek]

I know that exp(coef) is the Hazard Ratio, but in a certain output posted
down here also a exp(-coef) is present. 

               exp(coef) exp(-coef) lower .95 upper .95
ns(CD4, 4)1      0.29058     3.4413  0.144075    0.5861
ns(CD4, 4)2      0.09870    10.1316  0.029075    0.3351
ns(CD4, 4)3      0.03475    28.7806  0.007375    0.1637
ns(CD4, 4)4      0.10211     9.7933  0.019234    0.5421
drug[T.ddI]      1.31900     0.7582  0.989748    1.7578
AZT[T.failure]   1.46116     0.6844  1.087839    1.9626

What does exp(-coef) mean? 

Thank you in advance! 



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