biostat QQQQ - bilal1

[ArchivalUser]

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 ???

[ArchivalUser]

is it e.2.25

[ArchivalUser]

e) ? (180/820) / (120/1360)

[ArchivalUser]

ans is eeeeeeee

[ArchivalUser]

RR=a/(a+b)/c/(c+d)

a=risk+disease=childless women-breast ca=180

b=risk+no disease=childless women -no cA=820

c=no risk+disease=child with bresat ca women=120
d=no risk+no Disease=child with women -no Ca=1360


RR=180/(1000)/120/1500

=180/1000*1500/120=2.25

[ArchivalUser]

dr bkc your ans and formula is correct . can i have your skype id /email address plz b/c i want to ask you some thingmy id is smirza11

[ArchivalUser]

hi,

drbkc83