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Appendix 1 Scales from the Final Model and Cronbach's α from Full Baseline Sample (n = 1,250; PCCaSO, 2005)

I will read you a list of reasons and I'd like you to tell me how important each of them is in your decision of whether or not to get colon cancer testing. Response options: (4) very important-important-somewhat important-(1) not important   
    Pros (α = 0.75) Believing that finding cancer early gives you a better chance for a cure 
 Having peace of mind after receiving clear findings 
 Believing that colon cancer testing is safe with few serious complications 
 Believing that those close to you will be relieved if you get tested for colon cancer 
 Believing that getting tested is part of taking care of yourself 
 Believing that colon cancer testing can find cancer early 
 Understanding that when polyps are found and removed, cancer can be prevented 
 Realizing that the benefits of having colon cancer testing outweigh any difficulty that you might have doing the test 
    Cons (α = 0.78) Being worried or concerned that if you do the test you might find something wrong 
 Being too embarrassed 
 Believing that colon cancer testing takes too much time 
 Thinking that doing the stool blood test might be disgusting 
 Expecting pain during a screening test 
 Believing that following a special diet or emptying your colon is too much trouble (prep) 
 Believing that the lack of symptoms means that you don't need colon cancer testing (no sx) 
 Having to arrange transportation to and from a colon cancer screening test (no ride) 
 Concern about the cost of the test or lack of insurance coverage 
 10 Being too embarrassed to talk to your doctor about colon cancer testing (MD emb) 
    Social influence Believing that members of your immediate family think you should get tested for colon cancer 
 Believing that most people your age are being told they should get tested for colon cancer (age grp) 
 Believing that your friends think you should get tested for colon cancer 
 Believing that your doctor thinks you should get tested for colon cancer 
This set of questions asks about how confident you are about certain aspects of colon cancer testing. Response options: (4) very confident-confident-not very confident-(1) not at all confident   
    Self-efficacy (α = 0.91) How confident are you that you can make a decision about whether or not to get colon cancer testing? 
 How confident are you that you can complete colon cancer testing? 
 How confident are you that you can complete colon cancer testing even if you are nervous about it? 
 How confident are you that you can complete colon cancer testing even if you are embarrassed about it? 
 How confident are you that you can find the time to complete colon cancer testing? 
 How confident are you that you can talk to your doctor about colon cancer testing? 
 How confident are you that you can carry out any necessary preparation for colon cancer testing? 
 How confident are you that you can get support from family or friends to help you complete colon cancer testing? 
Items dropped from the final model; cons items misinterpreted by participants   
 Needing/having a recommendation from your doctor (MDrec) 
 Feeling uncertain about what will be done during a colon cancer screening test 
 Realizing that you may need to adjust your schedule to do colon cancer testing 
 Believing that it would be upsetting to your family and friends if you had colon cancer 
I will read you a list of reasons and I'd like you to tell me how important each of them is in your decision of whether or not to get colon cancer testing. Response options: (4) very important-important-somewhat important-(1) not important   
    Pros (α = 0.75) Believing that finding cancer early gives you a better chance for a cure 
 Having peace of mind after receiving clear findings 
 Believing that colon cancer testing is safe with few serious complications 
 Believing that those close to you will be relieved if you get tested for colon cancer 
 Believing that getting tested is part of taking care of yourself 
 Believing that colon cancer testing can find cancer early 
 Understanding that when polyps are found and removed, cancer can be prevented 
 Realizing that the benefits of having colon cancer testing outweigh any difficulty that you might have doing the test 
    Cons (α = 0.78) Being worried or concerned that if you do the test you might find something wrong 
 Being too embarrassed 
 Believing that colon cancer testing takes too much time 
 Thinking that doing the stool blood test might be disgusting 
 Expecting pain during a screening test 
 Believing that following a special diet or emptying your colon is too much trouble (prep) 
 Believing that the lack of symptoms means that you don't need colon cancer testing (no sx) 
 Having to arrange transportation to and from a colon cancer screening test (no ride) 
 Concern about the cost of the test or lack of insurance coverage 
 10 Being too embarrassed to talk to your doctor about colon cancer testing (MD emb) 
    Social influence Believing that members of your immediate family think you should get tested for colon cancer 
 Believing that most people your age are being told they should get tested for colon cancer (age grp) 
 Believing that your friends think you should get tested for colon cancer 
 Believing that your doctor thinks you should get tested for colon cancer 
This set of questions asks about how confident you are about certain aspects of colon cancer testing. Response options: (4) very confident-confident-not very confident-(1) not at all confident   
    Self-efficacy (α = 0.91) How confident are you that you can make a decision about whether or not to get colon cancer testing? 
 How confident are you that you can complete colon cancer testing? 
 How confident are you that you can complete colon cancer testing even if you are nervous about it? 
 How confident are you that you can complete colon cancer testing even if you are embarrassed about it? 
 How confident are you that you can find the time to complete colon cancer testing? 
 How confident are you that you can talk to your doctor about colon cancer testing? 
 How confident are you that you can carry out any necessary preparation for colon cancer testing? 
 How confident are you that you can get support from family or friends to help you complete colon cancer testing? 
Items dropped from the final model; cons items misinterpreted by participants   
 Needing/having a recommendation from your doctor (MDrec) 
 Feeling uncertain about what will be done during a colon cancer screening test 
 Realizing that you may need to adjust your schedule to do colon cancer testing 
 Believing that it would be upsetting to your family and friends if you had colon cancer 
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