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.