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Table 2 Inaccurate self-reports by screening test among respondents

From: Survey mode and asking about future intentions did not impact self-reported colorectal cancer screening accuracy

  Mail Phone
  Intention No intention P-value†† Intention No intention P-value††
All responders, N 914 838   956 930  
FOBT, N with/without documented test 76/838 84/754   62/894 73/857  
n (%) false negatives 47 (61.8%) 62 (73.8%) 0.10 37 (59.7%) 37 (50.7%) 0.30
n (%) false positives 168 (20.1%) 141 (18.7%) 0.50 186 (20.8%) 179 (20.9%) 0.97
Sigmoidoscopy, N with/without documented test 449/465 426/412   373/583 356/574  
n (%) false negatives 159 (35.4%) 147 (34.5%) 0.78 152 (40.8%) 142 (39.9%) 0.81
n (%) false positives 74 (15.9%) 76 (18.5%) 0.32 63 (10.8%) 72 (12.5%) 0.36
Colonoscopy, N with/without documented test 755/159 660/178   691/265 648/282  
n (%) false negatives 111 (14.7%) 92 (13.9%) 0.68 89 (12.9%) 85 (13.1%) 0.90
n (%) false positives 30 (18.9%) 27 (15.2%) 0.37 60 (22.6%) 51 (18.1%) 0.19
CT colonography, N with/without documented test 30/884 21/817   24/932 25/905  
n (%) false negatives 6 (20.0%) 10 (47.6%) 0.064* 4 (16.7%) 11 (44.0%) 0.062*
n (%) false positives 60 (6.8%) 44 (5.4%) 0.23 31 (3.3%) 32 (3.5%) 0.80
Barium enema, N with/without documented test 25/889 15 / 823   22/934 14/916  
n (%) false negatives 5 (20.0%) 1 (6.67%) 0.38* 0 (0%) 0 (0%) --
n (%) false positives 286 (32.2%) 268 (32.6%) 0.86 220 (23.6%) 221 (24.1%) 0.77
Any screening , N with/without documented test 794/120 716/122   733/223 686/244  
n (%) false negatives 36 (4.5%) 33 (4.6%) 0.94 49 (6.7%) 29 (4.2%) 0.04
n (%) false positives 41 (34.2%) 36 (29.5%) 0.44 85 (38.1%) 85 (34.8%) 0.46
  1. *Fisher’s Exact.
  2. “Any screening” was defined as whether or not the person had any of the specific tests in the table.
  3. ††P-values for comparison of false negatives between intention vs no intention, and for comparison of false positives between intention vs no intention.