The Influence of Smoking, Gender, and Family History on Colorectal Adenomas

Table 1

Characteristics of the study population undergoing screening colonoscopy in the New Hampshire Colonoscopy Registry from 2004–2006.

Total	N (%) 5,395
Smoking
No pack-years	2,865 (53)
15 pack-years or fewer	1,243 (23)
More than 15 pack-years	1,287 (24)
Family History^a
Negative	4,649 (86)
Positive	746 (14)
Gender
Male	2,284 (42)
Female	3,111 (58)
Adenoma
None	4,689 (87)
One or more	706 (13)
Adenoma Size
No Adenoma	4,672 (87)
≤5 mm	318 (6)
5–9 mm	268 (5)
≥1 cm	120 (2)
	Mean (SO)
Mean Age (yrs.)	56 ( ±11)

^aFamily history was defined as a reported diagnosis of colon or rectal cancer in a mother, father, sibling, or child of the patient.