Table 4

Joinpoint analysis of crude prevalence

SegmentLower end pointUpper end pointAnnual percentage changeLower 95th CIUpper 95th CITest
statistic (t)
Prob > |t|
119932000−0.8−2.61.0−1.00.3
2200020047.8*3.112.73.70.0
3200420131.1*0.41.83.40.0
  • *Reflects significance at the 0.05 level.