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Table 1 Responder demographics by experimental arm

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

  Mail Phone
  Intention (N = 2248) No intention (N = 3775) Intention (N = 1701) No intention (N = 1695) Total Eligible (N = 9419) P value
Responders, N (%) 914 (40.7%) 838 (22.2%) 956 (56.4%) 930 (54.9%) 3638 (38.6%) < 0.0001
Among Responders       
Gender, N (%)   ** ** **   ***
F 503 (55.0%) 390 (46.5%) 572 (59.8%) 531 (57.2%) 4947 (52.5%)  
M 411 (45.0%) 448 (53.5%) 384 (40.2%) 398 (42.8%) 4470 (47.5%)  
Age ** **     ***
Mean (SD) 65.2 (10.2) 66.4 (10.8) 63.1 (10.0) 63.7 (10.3) 63.2 (10.4)  
Race, N (%) ** ** ** **   *
Caucasian 874 (95.6%) 795 (94.9%) 907 (94.9%) 889 (95.6%) 8677 (92.1%)  
Other 21 (2.3%) 11 (1.3%) 31 (3.2%) 22 (2.4%) 504 (5.4%)  
Unknown 19 (2.1%) 32 (3.8%) 18 (1.9%) 19 (2.0%) 238 (2.5%)
  1. *0.01 ≤ P-value < 0.05.
  2. **P-value < 0.01.
  3. ***P-value < 0.001.
  4. P-values (denoted by asterisks) are comparing distributions of responders within each mode to the total eligible (treating “Total” as fixed).
  5. Overall p-value comparing the distributions of responders between the four conditions.