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Table 4 Difference in difference in differences estimates for fecal occult blood test and endoscopy outcomes

From: Effectiveness of an organized colorectal cancer screening program on increasing adherence in asymptomatic average-risk Canadians

Outcome

 

DDD

  

Marginal effect

95% CI

p

FOBT

ON*Post*MD

0.008

−0.095

0.111

0.883

 

ON*Post*Ages65-74

0.028

−0.008

0.065

0.127

 

ON*Post*Ages35-49 a

−0.020

−0.052

0.012

0.214

 

ON*Post*Inactive

0.007

−0.029

0.042

0.720

 

ON*Post*Flu-Shot

0.010

−0.031

0.052

0.623

Endoscopy

ON*Post*MD

0.065

−0.007

0.137

0.077

 

ON*Post*Ages65-74

0.002

−0.022

0.027

0.853

 

ON*Post*Inactive

−0.003

−0.027

0.022

0.835

 

ON*Post*Flu-Shot

−0.007

−0.035

0.021

0.628

  1. N = 58,142; Weighted N = 2,882,630. Except a: N = 98,023; Weighted N = 5,844,306. All results are weighted.
  2. Dependent variables are self-report of having a FOBT or endoscopy (flexible sigmoidoscopy or colonoscopy) in past year. Group*Time terms are interacted with having a regular medical doctor, being aged 65–74 years, being aged 35–49 years, self-report of “inactive” on the Leisure Physical Activity Index, and reporting ever having had a flu shot. Control variables include year, province, Group, Time, Group*Time, sex, age category, geography, self-rated health, having MD, reporting flu shot, physical activity index, smoking status, ethnicity, education, income, #GP consultations past year, and Group* and Time* interactions with all of the characteristics listed above.