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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.