05-22-2009, 06:30 AM
the prevalence of breast ca is compared in 2 groups of woman based on parity. the following data are obtain at age of 70in both groups
children
yes no
breast ca yes 120 180 300
no 1360 820 2200
....................................................................
1500 1000 2500
based on these data what is the relative risk [risk ratio] for development of breast ca in childless woman compared with woman who have children ??
a..0.67
b..1.2
c..1.5
d.1.8
e.2.25
plz explain you answer too ???
children
yes no
breast ca yes 120 180 300
no 1360 820 2200
....................................................................
1500 1000 2500
based on these data what is the relative risk [risk ratio] for development of breast ca in childless woman compared with woman who have children ??
a..0.67
b..1.2
c..1.5
d.1.8
e.2.25
plz explain you answer too ???