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

From: Approaches for classifying the indications for colonoscopy using detailed clinical data

Characteristics Sample, n = 1,039
Age, year  
  55-64 252 (24.3)
  65-74 346 (33.3)
  75-85 441 (42.4)
Female 515 (49.5)
Study site
  A 206 (19.8)
  B 386 (37.2)
  C 129 (12.4)
  D 318 (30.6)
Poverty levels, quartiles*
  1 253 (24.4)
  2 251 (24.2)
  3 253 (24.4)
  4 248 (23.9)
  Missing 34 (3.3)
Length of enrollment with health plan before reference date, yr
  5.0-7.4 172 (16.6)
  7.5-9.9 115 (11.1)
  >10 752 (72.4)
Number of preventive outpatient health care visits within 5 years of reference date  
  0 411 (39.6)
  1 251 (24.2)
  2-3 243 (23.4)
  4+ 134 (12.9)
Family history of colorectal cancer (CRC) 96 (9.2)
Charlson comorbidity index at baseline‡
  0 842 (81.0)
  1 148 (14.2)
  2+ 49 (4.7)
Had a healthcare visit during the 2-year period at baseline‡ 161 (15.5)
Undergone colonoscopy 524 (50.4)
Had ≥2 colonoscopies 88 (8.5)
  1. *Households below 1999 federal poverty levels within the block-group from 2000 decennial census measures. Higher quartiles correspond to higher levels of household poverty in the census block-group.
  2. †This variable refers to family history that did not meet the exclusion – those with a history of colorectal cancer diagnosed in any first degree relative before age 50 or 2 or more relatives of any age, or other familial syndromes.
  3. ‡Baseline refers to the 2-year period at the beginning of each patient’s observation period.