NBME 2 #11

Prep for USMLE Forum

» Log in | Register

Forum

Step 1

Match

Prep4USMLE Forum » USMLE Step 1 Forum » Behavioral Science Forum

NBME 2 #11

Kaplan Test Prep and Admissions (Kaptest.com)

Author

4 Posts

step1000

Topics: 10
Posts: 29

05/02/08 - 12:48 PM

A case study is conducted to determine if women who delay childbearing are at increased risk for having children with low birth wt. a group of women who were at least 35 years old during their first pregnancy are compared with a group of women who were btwn age of 20-24 yr. during their first pregnancy.

age
20-24 >34 total #
low b.wt 21 54 75
n'l b.wt 404 745 1149
total: 425 799 1224

what's the odds ration for an older woman to have an infant w/ low b.wt?
a. (21/425) / (54/ 799)
b. (54/799) / (21/ 425)
c. (54/745) / (21/ 404)
d. (54/799) x 100
e. (54/75) / (745/ 1149)

lakshya_0_7
Forum Elite

Topics: 19
Posts: 240

05/02/08 - 04:04 PM

C......

construct the 2 x 2 table.......with

a = who are >35 and have LBW = 54

b = who are >35 and have normal babies = 745

c = 20-24 ys old with LBW babies =21

d =20-24 yr old with normal babies = 404

with this table the u get......a/c / b/c = 54/21 / 745/404 which is the same as C rearranged....

step1000

Topics: 10
Posts: 29

05/02/08 - 04:43 PM

thanks!

Ig F
Forum Elite
avatar

Topics: 3
Posts: 345

05/16/08 - 12:03 PM

well lakshya the c u wrote is different from the option c.can u please explain that

___________________
i m not perfect but i wanna get close to it......

You don't have permission to post.