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Joinpoint analysis of crude prevalence
| Segment | Lower end point | Upper end point | Annual percentage change | Lower 95th CI | Upper 95th CI | Test statistic (t) |
Prob > |t| |
| 1 | 1993 | 2000 | −0.8 | −2.6 | 1.0 | −1.0 | 0.3 |
| 2 | 2000 | 2004 | 7.8* | 3.1 | 12.7 | 3.7 | 0.0 |
| 3 | 2004 | 2013 | 1.1* | 0.4 | 1.8 | 3.4 | 0.0 |
*Reflects significance at the 0.05 level.
