Table 4 Parameter estimates by Poisson regression analysis

(Intercept)

6.816

0.0386

6.740 - 6.891

< 0.001

Year 2009

-3.907

0.2034

-4.306 - -3.508

< 0.001

Year 2008

-4.405

0.2598

-4.914 - -3.895

< 0.001

Year 2007

-3.085

0.1365

-3.353 - -2.818

< 0.001

Year 2006

-2.721

0.1149

-2.946 - -2.496

< 0.001

Year 2005

-0.948

0.0540

-1.054 - -0.842

< 0.001

Year 2004

-0.483

0.0462

-0.574 - -0.393

< 0.001

Year 2003

0 ^a

Pregnancy

-2.530

0.1196

-2.765 - -2.296

< 0.001

≧ 5 years old

0.532

0.0409

0.452 - 0.612

< 0.001

<5 years old

0 ^a

(Scale)

2.068 ^b