Table 3.

Summary of joinpoint APC for tonsil surgery incidence in boys (A) and girls (B) 1987–2013

Lower end point	Upper end point	APC	Lower 95% CI	Upper 95% CI	p Value
(A) Boys
1987	1994	12.0	9.3	14.8	<0.001
1994	2001	−7.7	−10.2	−5.1	<0.001
2001	2013	6.0	5.0	6.9	<0.001
(B) Girls
1987	1995	7.1	5.3	8.9	<0.001
1995	2001	−7.2	−10.2	−4.2	<0.001
2001	2013	4.9	4.0	5.8	>0.001

Significant trends in bold type.

The APC is significant different from zero at α=0.05. CI.

APC, annual percentage change.