Table 3
(a) Comparison of adenoma occurrence among men and women in a colorectal screening population in relation to smoking history.

Men (N, column%)Women (N, column %)
Adenoma StatusNo Pack-Years 15 Pack-Years > 15 Pack-Years 𝑃 a No Pack-Years 15 Pack-Years > 15 Pack-Years 𝑃 a

None969 (85)402 (82)514 (78) < . 0 0 1 1,570 (91)693 (92)541 (86) < . 0 0 1
One or more166 (15)90 (18)143 (22)160 (9)58 (8)89 (14)

(b) Comparison of adenomas among a colorectal screening population with and without a family history of colorectal cancer or polyps, in relation to smoking status.

No Family HistoryFamily History
Adenoma StatusNo Pack-Years 15 Pack-Years > 15 Pack-Years 𝑃 a No Pack-Years 15 Pack-Years > 15 Pack-Years 𝑃 a

None2,195 (90)935 (88)944 (83) < . 0 0 1 344 (83)160 (86)111 (75) . 0 1 9
One or more257 (10)123 (12)195 (17)69 (17)25 (14)37 (25)

a 𝑃 -values based on Pearson's 𝜒 2 .