Table 1 Attributes and Levels Used in the Stated Preference Survey

Process

How is it done?

Stool

You place 2 stool samples onto special cards for 3 consecutive days and return them to your doctor

Scope

A flexible tube with a small camera at the tip is inserted into your rectum and through your colon

CT

You lie on a special table while a machine moves around you and takes x-ray pictures (like a CAT scan)

Enema and X-ray

Air and a white liquid are injected into your colon through a rectal tube. x-ray pictures are taken as the liquid moves through your colon*

Pain

Is there pain or discomfort?

None

You feel no pain during the test

Mild

You may feel mild pain or discomfort during the test*

Preparation

What do you do to prepare?

None

No preparation required

Diet

You must alter your diet for 5 days by avoiding some specific foods and over-the-counter medications

Enema/lax

Before the test you must take laxatives or enemas which cause diarrhea to clean your colon*

Specificity

Is it accurate if you DO NOT have cancer?

100%

If you DO NOT have cancer, the test result will never say you may have cancer. No other test is needed.

80%

If you DO NOT have cancer, the test result will say you may have cancer 2 out of 10 times. You then need to have a different test done

50%

If you DO NOT have cancer, the test result will say you may have cancer 5 out of 10 times. You then need to have a different test done.*

Sensitivity

Is it accurate if you DO

90%

If you DO have cancer, the test will miss it 1 out of 10 times

70%

If you DO have cancer, the test will miss it 3 out of 10 times

40%

If you DO have cancer, the test will miss it 6 out of 10 times*

Cost

How much would you pay?

$10

$10*

$50

$50

$250

$250

$500

$500