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Table 1 Attributes and Levels Used in the Stated Preference Survey

From: An empirical comparison of methods for analyzing correlated data from a discrete choice survey to elicit patient preference for colorectal cancer screening

Attributes Attribute description as presented to patients Levels Level description as presented to patients
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
  1. *Reference level for attribute
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