Table 2.

Population Characteristics of Study Participants

Characteristics	Number of Studies Reporting	Citation	Distribution Median (IQI)
Age
Reported in years	46	32–34, 36, 37, 39, 42, 46, 47, 51, 50–58, 60, 61, 63–66, 68–72, 74, 76–78, 80–86, 88–91, 93,100–103,105,107	54 years (46 to 60)
Reported in ranges	25	35, 38, 43–45, 48–50, 52, 53, 59, 67, 73, 75, 79, 87, 92, 94–99, 104, 106	Not applicable
Not reported	5	40, 41, 54, 55, 62	Not applicable
Sexa
Female	20	33, 39, 40, 44, 45, 50, 53, 58, 61, 65, 66, 69, 70, 74, 79, 82, 101, 102, 104, 105	68% (57% to 76%)
Male	20	33, 39, 40, 44, 45, 50, 53, 58, 61, 65, 66, 69, 70, 74, 79, 82, 101, 102, 104, 105	32% (24% to 43%)
100% Female	2	36, 67	Not applicable
Not reported	1	62	Not applicable
Race and ethnicity, U.S. only (71 studies)
American Indian/Alaska Native	1	85	42%
Asian-American	4	39, 50, 65, 102	29% (9% to 46%)
Black or African American	10	34, 37, 50, 53, 65, 67, 85, 87, 94, 105	33% (27% to 50%)
Hispanic/Latino	7	34, 37, 40, 42, 50, 65, 102	45% (12% to 58%)
White	12	33, 34, 40, 50, 53, 64, 65, 67, 85, 86, 94, 105	50% (22% to 85%)
Recruited specific populations
100% American Indian/Alaska Native	2	46, 58	Not applicable
100% Asian American	18	38, 45, 51, 56, 66, 68, 73, 74, 77, 79–82, 97–99, 101, 103	Not applicable
100% Black or African American	12	32, 42, 48, 54, 57, 61, 62, 69, 75, 90, 91, 95	Not applicable
100% Hawaiian and Pacific Islander	3	35, 76, 96	Not applicable
100% Hispanic/Latino	15	36, 41, 43, 44, 49, 52, 72, 78, 83, 84, 92, 93, 100, 104, 106	Not applicable
100% Serbo-Croatian	2	88, 89	Not applicable
Not reported	3	63, 70, 71	Not applicable
Employment status
Employed	36	36, 38, 42, 43, 45, 49, 51, 54, 56, 61, 63, 66–68, 72–74, 76–84, 86, 87, 90, 94–96, 101, 102, 104, 107	48% (27% to 58%)
Not reported	40	32–35, 37, 39–41, 44, 46–48, 50, 52, 53, 55, 57–60, 62, 64, 65, 69–71, 75, 85, 88, 89, 91–93, 97–100, 103, 105, 106	Not applicable
Incomeb
≥50% with annual household income less than $40,000	30	36–38, 42, 43, 46, 48, 49, 52, 53, 57, 61, 72, 74–76, 78, 79, 82, 83, 90, 92–95, 101, 102, 104, 105, 107	Not applicable
Focused on low-income communitiesc	5	33, 47, 65, 87, 106	Not applicable
Not reported	34	34, 35, 39–41, 44, 50, 51, 54–56, 58–60, 62, 64, 67, 68, 70, 71, 73, 77, 80, 84, 85, 88, 89, 91, 96–100, 103	Not applicable
Education
Less than high school education	37	33, 36, 39, 40, 42, 43, 45, 46, 48, 49, 51, 52, 61, 66–69, 73–75, 77–82, 85–87, 89, 94, 95, 99, 100, 103, 104, 106	41% (28% to 64%)
High school graduate or equivalent	25	33, 36, 39, 42, 43, 45, 46, 51, 54, 61, 66, 67, 69, 73–75, 79, 85–87, 94, 95, 97, 100, 103	31% (25% to 36%)
More than high school education	33	33, 36, 37, 39, 42, 43, 45, 46, 51, 56, 57, 61, 63, 66, 67, 69, 73–76, 79, 83–86, 91, 94, 95, 100, 102, 103, 105, 107	32% (16% to 55%)
Not reported	18	34, 35, 41, 44, 47, 50, 53, 55, 58–60, 62, 64, 65, 70, 88, 92, 96	Not applicable
Insurance status
Insured	46	32, 33, 36–38, 40, 42, 43, 45, 46, 48–54, 56, 57, 65–67, 70–72, 74, 76, 78–86, 90, 93, 94, 96, 100, 101, 103, 104, 106, 107	67% (46% to 81%)
100% insured	8	34, 39, 47, 55, 59, 60, 88, 92	Not applicable
Not reported	20	35, 41, 44, 58, 61–64, 68, 69, 73, 77, 87, 91, 95, 97–99, 102, 105	Not applicable

^aOnly studies examining intervention impact on colorectal cancer screening.

^bSeven studies provided income data measured in various ways and could not be summarized.

^cStudy authors stated interventions were implemented in communities with low income, but no specific numbers provided.