Table 1.
Segmented regression analysis showing changes in intercept and changes in slope on FOBT participation rates following each initiative, 1994-2012
| 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) |
*Difference between pre and post initiative intercepts interpreted as step change and calculated as QPC = (exp βINTi -1 )* 100.
^Difference between pre and post initiative slopes taking into account the trend before the initiative and calculated as QPC = (exp βINT*TIMEi -1 )* 100.
¥Baseline slope.
‡Statistically significant if 95% confidence interval does not cross zero.
RCT: Publication of the second and third randomized controlled trials in November 1996.
CTFPHC: Publication of the Canadian Task Force on Preventive Health Care guidelines for CRC screening in February 2001.
FI: Announcement of PCP financial incentives in July 2005.
CCC launch: ColonCancer Check program (CCC) Program launch, April 2008.
2 - year anniversary: ColonCancerCheck Program 2-year anniversary, April 2010.