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Table 4 FIT completion by patients’ neighborhood characteristics

From: Moderators of the effectiveness of an intervention to increase colorectal cancer screening through mailed fecal immunochemical test kits: results from a pragmatic randomized trial

Subgroup variable

Number of participants

Percentage completed FIT

Percentage completed FIT

Adjusted IRRa (95% CI)

Interaction P value

UC

IG

ED visits per 1000 Medicaid/Medicare population

 > 419 visits

28,255

16.1

14.2

17.8

1.34 (1.00, 1.78)

0.36

 ≤ 419 visits

2207

8.5

6.8

14.6

1.73 (0.95, 3.14)

Gini Inequality score

 > 0.4106

17,403

15.2

13.1

17.1

1.37 (1.02, 1.83)

0.81

 ≤ 0.4106

12,362

16.1

13.5

18.8

1.39 (1.04, 1.86)

Median household income

 ≤ $68,426

27,768

15.6

13.2

17.7

1.37 (1.03, 1.82)

0.67

 > $68,426

1997

15.4

14.1

17.8

1.44 (0.99, 2.10)

Percentage college graduates

 ≤ 41%

24,391

15.7

13.2

17.9

1.38 (1.04, 1.84)

0.61

 > 41%

5375

15.1

13.6

16.8

1.33 (0.96, 1.83)

Population density per square mile

 ≤ 1000 (rural)

10,330

13.4

10.6

15.5

1.45 (1.07, 1.96)

0.26

 > 1000 (non-rural)

19,437

16.7

14.5

19.2

1.32 (0.99, 1.78)

Poverty (percentage below 100% FPL)

 > 17.6%

15,665

16.2

13.8

18.5

1.30 (0.97, 1.74)

0.06

 ≤ 17.6%

14,100

14.8

12.8

16.9

1.47 (1.10, 1.98)

Unemployment rate

 > 6.6%

26,669

15.4

13.1

17.4

1.37 (1.03, 1.82)

0.50

 ≤ 6.6%

3097

17.4

14.6

20.9

1.46 (1.04, 2.04)

  1. Abbreviations: CI Confidence interval, ED Emergency department, FIT Fecal immunochemical test, FPL Federal poverty level, Gini The Gini Index, or index of neighborhood income concentration, higher number means greater inequality, range 0–1.0, IG Intervention group, IRR Incidence rate ratio, UC Usual care group
  2. aData based on mixed effects Poisson regression analysis controlling for clinic level clustering and adjusting for subgroup variable and, as applicable, age, gender, and health center