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Table 2 Joinpoint regression analysis for FOBT participation in Ontario, 1994–2012 showing actual intercept at each joinpoint and actual slope between joinpoints

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

Identified segment Join-point Intercept Slope
   Intercept£  95% CI QPC^  95% CI
April 1994-April 1997   0.3 (0.15-0.47) −1.7¥ (−3.9–0.5)
April 1997-July 2005 Q 13 0.15 (0.02-0.28) 3.8 (3.4–4.2)
July 2005-October 2009 Q 46 0.03 (−0.47-0.53) 7.4 (6.4–8.5)
October 2009-January 2010 Q 59 62.1 (59–64.9) −5.5 (−9.9--0.9)
January 2010-January 2011 Q 64 0.01 (−4.5-4.5) 8.2 (0.9-16)
January 2011-March 2012 Q 68 6 (3.1-8.9) −1.4 (−5.5–2.9)
  1. £Intercept at each joinpoint calculated as (exp β INTERCEPT i).
  2. ^Quarterly percent change (slope) between joinpoints calculated as (exp β SLOPEi -1)* 100.
  3. ¥Baseline trend.
  4. ‡Statistically significant if 95% confidence interval does not cross zero.