Table 1 Demographic and clinical characteristics of cases and controls, SEARCH Study 2006–2008, n = 1,039

Age, year

  55-64

  65-74

  75-85

Female

Study site

  A

  B

  C

  D

Poverty levels, quartiles*

  1

  2

  3

  4

  Missing

Length of enrollment with health plan before reference date, yr

  5.0-7.4

  7.5-9.9

  >10

Number of preventive outpatient health care visits within 5 years of reference date

  0

  1

  2-3

  4+

Family history of colorectal cancer (CRC)^†

Charlson comorbidity index at baseline‡

  0

  1

  2+

Had a healthcare visit during the 2-year period at baseline‡

Undergone colonoscopy

Had ≥2 colonoscopies