Table 6.

Associations between cigarette smoking and colorectal polyp features.

Variable	n (%)	Model 1a		Model 2b		Model 3c
		HR (95%CI)	P value	HR (95%CI)	P value	HR (95%CI)	P value
Polyp position
colon	81 (75.7)	1.836 (1.107–3.045)	0.019	1.587 (0.913–2.758)	0.102	1.544 (0.877–2.721)	0.133
rectum	32 (29.9)	3.985 (1.966–8.075)	<0.001	3.543 (1.579–7.948)	0.002	2.975 (1.315–6.726)	0.009
Maximum polyp size
<1 cm	101 (94.4)	2.186 (1.425–3.352)	<0.001	1.970 (1.218–3.185)	0.006	1.903 (1.154–3.136)	0.012
≥1 cm	6 (5.6)	3.174 (0.581–17.349)	0.183	2.458 (0.400–15.114)	0.332	2.348 (0.365–15.127)	0.369
Number of polyp(s)
1	72 (67.3)	2.485 (1.504–4.106)	<0.001	2.200 (1.253–3.863)	0.006	2.112 (1.182–3.773)	0.012
≥2	35 (32.7)	2.297 (1.103–4.788)	0.026	2.093 (0.928–4.719)	0.075	1.875 (0.820–4.287)	0.136

^aUnadjusted.

^bAdjusted for age and gender.

^cAdjusted for age, gender, body mass index, regular smoker, regular drinker, red blood cell count, hemoglobin, plasma viscosity, albumin, creatinine.