Table 1.

Demographic characteristics according to the presence of a histologically confirmed proximal ACF

Overall (N = 170)No proximal ACF (n = 103)At least one proximal ACF (n = 67)
Age (y)56.6 ± 7.956.2 ± 8.657.1 ± 6.7
Male100 (58.8)58 (56.3)42 (62.7)
Caucasian139 (81.8)85 (82.5)54 (80.6)
BMI (kg/m2)
 Normal (<25)39 (22.9)25 (24.3)14 (20.9)
 Overweight (25–29.9)59 (34.7)40 (38.8)19 (28.4)
 Obese (≥30)72 (42.4)38 (36.9)34 (50.7)
Smoking
 Current21 (12.4)12 (11.7)9 (13.4)
 Former61 (35.9)36 (35.0)25 (37.3)
 Never88 (51.8)55 (53.4)33 (49.3)
History of screening colonoscopy (yes)87 (51.2)51 (49.5)36 (53.7)
 History of polyps41 (24.8)22 (22.0)19 (29.2)
Regular any aspirin use64 (37.6)39 (37.9)25 (37.3)
 Daily baby aspirin (81 mg)52 (30.6)33 (32.0)19 (28.4)
 Daily regular strength (325 mg)17 (10.0)10 (9.7)7 (10.4)
Regular other NSAIDs use88 (52.1)52 (51.0)36 (53.7)
Regular multivitamin use104 (61.2)70 (68.0)34 (50.7)a
Regular folic acid use25 (14.7)15 (14.6)10 (14.9)
Regular calcium use50 (29.4)36 (35.0)14 (20.9)
Regular vitamin D use62 (36.0)40 (38.8)22 (32.8)
Family history of cancer128 (80.5)75 (79.8)53 (80.3)
Number of synchronous polyps1.1 ± 1.30.7 ± 1.11.6 ± 1.5c
Endoscopic count of distal ACF15.8 ± 15.113.1 ± 12.119.9 ± 18.1b
  • NOTE: Values are means ± SD or n (%). Statistical comparisons are made using either Student t test for continuous variables or the χ2 test for categorical variables. Synchronous polyps are defined as the number of polyps detected during the study procedure.

  • aP < 0.05.

  • bP < 0.01.

  • cP < 0.0001.