Table 2.

Univariate Analysis of Characteristics Associated with Positive Year 3 or Year 5 Flexible Sigmoidoscopy Screening

Baseline Characteristics	Total N = 22,525	Positive Screen	Relative Risk	p value
Race
White	21,550	4183	Reference
Black	975	304	1.61 (1.46, 1.75)	< 0.001
Education
High School or Less	9266	1846	Reference
Some College/College Graduate	8779	1787	1.02 (0.96, 1.08)	0.468
Postgraduate	4480	854	0.96 (0.89, 1.03)	0.234
Gender
Male	11,758	2676	Reference
Female	10,767	1811	0.74 (0.70, 0.78)	<0.001
Age in years
≤ 59	8941	1908	Reference
60–64	7007	1398	0.94 (0.88, 0.99)	0.032
65–69	4371	753	0.81 (0.74, 0.87)	< 0.001
70+	2206	428	0.91 (0.82, 1.00)	0.045
BMI in Kg/m2
< 18.5	139	22	0.93 (0.59, 1.47)	0.752
18.5–< 25	7018	1182	Reference
25–< 30	9843	2015	1.22 (1.14, 1.29)	< 0.001
30+	5358	1226	1.36 (1.27, 1.45)	< 0.001
Smoking Status
Never	11,625	1903	Reference
Current	1554	521	2.05 (1.91, 2.19)	< 0.001
Former	9344	2063	1.35 (1.28, 1.42)	< 0.001
Family History of CRC
No	19,966	3955	Reference
Yes	1865	381	1.03 (0.94, 1.13)	0.521
Year of Repeat FSG
Year 5	18,271	3871	Reference
Year 3	4254	616	0.63 (0.57, 0.69)	< 0.001
Screening Center
One	4679	1021	Reference
Two	1853	358	0.86 (0.75, 0.98)	0.026
Three	827	336	2.45 (2.10, 2.86)	< 0.001
Four	898	84	0.37 (0.29, 0.47)	< 0.001
Five	2370	684	1.45 (1.30, 1.63)	< 0.001
Six	2521	375	0.68 (0.61, 0.76)	< 0.001
Seven	3059	410	0.61 (0.55, 0.69)	< 0.001
Eight	2327	365	0.72 (0.64, 0.80)	< 0.001
Nine	3053	450	0.68 (0.60, 0.75)	< 0.001
Ten	938	404	1.97 (1.83, 2.10)	< 0.001