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Table 1 Segmented regression analysis showing changes in intercept and changes in slope on FOBT participation rates following each initiative, 1994-2012

From: Evaluating the impact of public health initiatives on trends in fecal occult blood test participation in Ontario

Initiative (Segment)

Intercept*

Slope^

 

Change in Intercept (Δ)

 95% CI

Change in slope (Δ)

95% CI

Baseline (April 94-October 96)

  

−2.4¥‡

(−3.9--0.9)

RCT (October 96-January 01)

−3.2

(−13.1-7.9)

6.1‡

(4.3-7.9)

CTFPHC (January 01-July 05)

6.8

(−2.8-17.3)

0.3

(−0.6–1.3)

FI (July 05- April 08)

−1.5

(−11.9–10.1)

2.2‡

(0.7– 3.8)

CCC launch (April 08-April 10)

35.4‡

(18.3–54.9)

−9.7‡

(−12--7.4)

2-year anniversary (April 10 –March 12)

13.5

(−1.6–30.9)

7.2‡

(3.9–10.5)

  1. *Difference between pre and post initiative intercepts interpreted as step change and calculated as QPC = (exp βINTi -1 )* 100.
  2. ^Difference between pre and post initiative slopes taking into account the trend before the initiative and calculated as QPC = (exp βINT*TIMEi -1 )* 100.
  3. ¥Baseline slope.
  4. ‡Statistically significant if 95% confidence interval does not cross zero.
  5. RCT: Publication of the second and third randomized controlled trials in November 1996.
  6. CTFPHC: Publication of the Canadian Task Force on Preventive Health Care guidelines for CRC screening in February 2001.
  7. FI: Announcement of PCP financial incentives in July 2005.
  8. CCC launch: ColonCancer Check program (CCC) Program launch, April 2008.
  9. 2 - year anniversary: ColonCancerCheck Program 2-year anniversary, April 2010.
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BMC Cancer

ISSN: 1471-2407

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