Table 1.

Characteristics of controls, adenoma cases, and hyperplastic polyp cases: Group Health members undergoing colonoscopy, 1998–2003

CharacteristicControls (N = 250), n (%)Adenomas (N = 167), n (%)PaHyperplastic polyps (N = 87), n (%)Pb
Age, y
 30–4954 (22)19 (11)11 (13)
 50–5988 (35)45 (27)28 (32)
 60–6957 (23)58 (35)29 (33)
 70–7951 (20)45 (27)<0.0119 (22)0.13
Men99 (40)84 (50)0.0341 (47)0.22
Race/ethnicity
 Caucasian221 (88)151 (90)76 (87)
 African American8 (3)3 (2)4 (5)
 Asian American10 (4)5 (3)1 (1)
 Hispanic2 (1)5 (3)4 (5)
 Other9 (4)3 (2)0.412 (2)0.18
Cigarette smoking status
 Never108 (43)68 (41)26 (30)
 Former119 (48)86 (51)51 (59)
 Current22 (9)13 (8)0.7510 (11)0.09
Education
 High school graduate or less31 (12)24 (14)13 (15)
 Some college/vocational school70 (28)57 (34)29 (33)
 College graduate61 (24)26 (16)19 (22)
 Post–college graduate school88 (35)60 (36)0.1526 (30)0.66
BMI, kg/m2
 <2590 (36)53 (32)23 (26)
 25–29.9100 (40)70 (42)31 (36)
 ≥3058 (23)43 (26)0.7733 (38)0.05
Alcohol consumption, drinks/wk
 051 (20)42 (25)21 (24)
 1–7174 (70)96 (57)56 (64)
 8–1419 (8)16 (10)5 (6)
 >146 (2)13 (8)0.025 (6)0.36
History of colorectal polyps51 (20)90 (54)<0.0135 (40)<0.01
  • aχ2P value comparing adenoma cases to controls.

  • bχ2P value comparing hyperplastic polyp cases to controls.