Identified segment

Joinpoint

Intercept

Slope


 
Intercept^{£}

95% CI

QPC^{^}

95% CI


April 1994April 1997
 
0.3

(0.150.47)

−1.7^{¥}

(−3.9–0.5)

April 1997July 2005

Q 13

0.15^{‡}

(0.020.28)

3.8^{‡}

(3.4–4.2)

July 2005October 2009

Q 46

0.03

(−0.470.53)

7.4^{‡}

(6.4–8.5)

October 2009January 2010

Q 59

62.1^{‡}

(59–64.9)

−5.5^{‡}

(−9.90.9)

January 2010January 2011

Q 64

0.01

(−4.54.5)

8.2^{‡}

(0.916)

January 2011March 2012

Q 68

6^{‡}

(3.18.9)

−1.4

(−5.5–2.9)


^{£}Intercept at each joinpoint calculated as (exp β _{INTERCEPT i}).
 ^Quarterly percent change (slope) between joinpoints calculated as (exp β _{SLOPEi} 1)* 100.
 ¥Baseline trend.
 ‡Statistically significant if 95% confidence interval does not cross zero.