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Prep4USMLE Forum » USMLE Step 2 CK Forum » Preventive Medicine

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5 Posts

Kamsi
Forum Guru

Topics: 103
Posts: 347

09/21/07 - 03:24 AM

Two studies were conducted in the same population to assess the relationship between oral contraceptive use and
the risk of deep venous thrombosis (DVP). Study A demonstrated increased risk of DVT among oral contraceptive
users with a relative risk of 2.0 and a 95% confidence interval 1.2 – 2.8. Study B showed the following results: relative

risk of 2.01 and a 95% confidence interval 0.8 – 3.1. Which of the following statements is most probably true about
these two studies?

A. The result in study A is not statistically significant
B. The result in study B is biased

C. The result in study A is not accurate
D. The sample size in study B is small

E. P value in study B is less then 0.05

Pls explain

Doc750
transfer:step 3 prison
avatar

Topics: 52
Posts: 636

09/21/07 - 05:23 AM

D, sample size is to small hence the larger variance in the C.I.

___________________
Experience is a hard teacher because she gives the test first, and the lesson afterwards.

starcraftbw
Forum Senior

Topics: 13
Posts: 166

09/21/07 - 08:44 AM

D. test B is not stats significant.... large range of CI = smaller sample size.....

test A is stats signif

area51
Forum Newbie

Topics: 0
Posts: 1

11/01/07 - 01:34 PM

Test a is NOT statistically significant since the CI does not include 1.

gr8doc
Forum Senior

Topics: 8
Posts: 210

11/12/07 - 04:58 AM

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