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!
Relative risk (RR):
an expression of excess
risk relative to the underlying (baseline) risk. If
excess risk is zero, RR is 1 (100%). If excess
risk equals the baseline risk, RR is 2 (200%)
!
Absolute risk:
an expression of excess risk
based on the assumption that the excess risk
from radiation exposure
adds to
the underlying
risk by an increment dependent on dose but
independent of the underlying natural risk
Relative risk
is preferred to
Absolute risk