Question

Epidemiologists decided to investigate the validity of new diagnostic tool for breast cancer. They used this new diagnostic tool for breast cancer in 150 women with biopsy-proven breast cancer in 300 age- and race-matched control women. The results of the new tool were positive in 136 cases and in 35 control women, all of whom showed no evidence of cancer at biopsy. What is the sensitivity of new diagnosis tool for breast cancer?

	a.	33%
	b.	91%
	c.	9%
	d.	12%
	e.	88%

Answer 1

Answer B - 91%

My calculation is 90.6% since its approximate 91% ,chose option b.

The true positive cases are the ones which had positive biospy result and positive screening test result.

False positive cases are the ones with negative biopsy result and positive screening test result.

False negative cases are the ones with positive biopsy result and negative screening test result . So it will be 150-136 .

True negative cases are the ones with both screening and biopsy as negative

So control group 300- 35 .

if this helps please give it a positive rating thank you!