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Table 3 FIT completion by individual-level patient 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

Age

 50–64

24,998

15.2

13.0

17.3

1.36 (1.02, 1.81)

0.58

 65–74

5669

16.9

14.4

19.0

1.41 (1.03, 1.94)

Gender

 Female

16,986

16.3

14.2

18.3

1.33 (1.00, 1.78)

0.33

 Male

13,681

14.5

12.0

16.8

1.42 (1.05, 1.90)

Race

 White

25,896

14.4

12.9

15.8

1.32 (0.99, 1.76)

0.003

 Black

1372

17.8

14.9

20.2

1.28 (0.85, 1.92)

 Asian

1495

30.8

18.9

37.7

2.06 (1.41, 3.01)

Hispanic ancestry

 Non-Hispanic

25,597

14.8

12.5

16.8

1.39 (1.05, 1.85)

0.19

 Hispanic

4014

21.2

18.7

24.3

1.25 (0.91, 1.71)

Primary language

 English

24,632

13.5

11.8

15.1

1.38 (1.04, 1.84)

0.89

 Non-English

5553

25.5

20.2

30.6

1.40 (1.03, 1.90)

Insurance status

 Uninsured

6742

16.0

13.3

19.1

1.29 (0.94, 1.78)

0.67

 Medicaid

11,646

16.2

13.3

18.9

1.38 (1.02, 1.88)

 Medicare

7430

15.5

13.8

17.1

1.34 (0.98, 1.84)

 Commercial

4227

13.0

12.8

13.3

1.48 (1.05, 2.08)

Federal poverty level

 ≤ 100%

12,152

16.8

14.4

19.0

1.29 (0.95, 1.75)

0.42

 > 100–150%

5123

16.1

13.3

18.9

1.37 (0.99, 1.89)

 > 151–200%

2384

14.9

13.0

17.1

1.27 (0.88, 1.83)

 > =200%

4054

14.4

11.9

17.7

1.51 (1.07, 2.11)

Flu shot past year

 No

23,114

14.2

12.1

16.2

1.39 (1.04, 1.86)

0.46

 Yes

7553

19.4

16.7

22.2

1.32 (0.98, 1.79)

Mammogram in past 2 years

 No

11,741

14.7

12.7

16.5

1.27 (0.96, 1.67)

0.18

 Yes

5245

20.0

17.5

22.5

1.42 (1.06, 1.90)

Pap test in last 3 years

 No

8353

14.2

12.4

16.0

1.28 (0.97, 1.70)

0.40

 Yes

5281

19.0

16.6

21.5

1.37 (1.03, 1.84)

Smoking status

 Former or never

18,811

17.3

14.6

19.9

1.40 (1.04, 1.87)

0.16

 Current

8129

12.3

10.8

13.7

1.25 (0.91, 1.72)

Body mass index

 < 30.0 kg/m2

16,053

15.8

13.0

18.5

1.44 (1.07, 1.93)

0.08

 ≥ 30.0 kg/m2

12,429

15.7

13.9

17.4

1.28 (0.95, 1.72)

Charlson comorbidities

 0–2

28,189

15.7

13.5

17.8

1.35 (1.01, 1.80)

0.16

 ≥ 3

2478

13.2

10.4

15.9

1.61 (1.11, 2.32)

Visits for chronic pulmonary disease

 No

24,688

15.7

13.4

17.8

1.35 (1.01, 1.80)

0.50

 Yes

5979

14.7

12.3

17.0

1.42 (1.04, 1.95)

Visits for diabetes

 No

24,020

14.8

12.4

17.0

1.42 (1.06, 1.89)

0.06

 Yes

6647

18.1

16.3

20.0

1.23 (0.91, 1.67)

Visits for depression

 No

23,163

16.1

13.7

18.3

1.37 (1.03, 1.84)

0.66

 Yes

7355

13.9

12.1

15.8

1.33 (0.98, 1.81)

  1. Abbreviations: FIT Fecal immunochemical test, IG Intervention group, IRR Incidence rate ratio, UC Usual care group, CI Confidence interval
  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