1%
Calculate
the
etiologic
fraction
when
the
RR
for
discase
associated
with
a
given
exposure
is
1.2,
1.8,
3,
and
15.
The
impact
of
an
exposure
on
a
population
does
not
depend
upon:
a.
the
strength
of
the
association
between
exposure
and
disease.
b.
the
prevalence
of
the
exposure.
c.
the
case
fatality
rate.
d.
the
overall
incidence
rate
of
disease
in
the
population.
The
next
seven
questions
(3-9)
are
based
on
the
following
data:
The
death
rate
per
100,000
for
lung
cancer
is
7
among
nonsmokers
and
71
among
smokers.
The
death
rate
per
100,000
for
coronary
thrombosis
is
422
among
nonsmokers
and 599
among
smokers.
The
prevalence
of
smoking
in
the
population
is
55%.
(If
necessary,
refer
to
the
chapter
on
cohort
studies
for
formulas
for
RR.)
What
is
the
RR
of
dying
of
lung
cancer
for
smokers
versus
nonsmokers?
What
is
the
RR
of
dying
of
coronary
thrombosis
for
smokers
versus
nonsmokers?
