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Table 2 Joinpoint analysis of newly smear-positive TB in different geographic regions of China

From: Changes in newly notified cases and control of tuberculosis in China: time-series analysis of surveillance data

  Newly smear-positive TB* Annual percentage change (95% CI) P value
All provinces    
 1997 to 2002 11.21 to 12.49 1.1 (−3.5 to 5.8) 0.600
 2002 to 2005 12.49 to 41.90 42.8 (22.5–66.5)  < 0.001
 2005 to 2010 41.90 to 34.21  −3.0 (−6.6 to 0.8) 0.100
 2010 to 2018 34.21 to 16.23  −9.9 (−12.7 to −6.9)  < 0.001
Eastern provinces    
 1997 to 2002 13.07 to 13.67 1.0 (−1.9 to 4.1) 0.500
 2002 to 2005 13.67 to 34.10 29.3 (16.3–43.8)  < 0.001
 2005 to 2010 34.10 to 29.54 −2.9 (−5.5 to −0.1)  < 0.001
 2010 to 2018 29.54 to 12.61  − 10.3 (− 11.5 to − 9.2)  < 0.001
Central provinces    
 1997 to 2002 11.36 to 12.49  − 0.1 (− 4.9 to 4.8) 1.000
 2002 to 2005 12.49 to 51.43 54.7 (32.5–80.7)  < 0.001
 2005 to 2010 51.43 to 39.50  − 3.4 (− 6.9 to 0.2) 0.100
 2010 to 2018 39.50 to 18.59  − 9.6 (− 11.2 to − 8.0)  < 0.001
Western provinces    
 1997 to 2002 8.61 to 9.83 2.4 (− 6.0 to 11.5) 0.600
 2002 to 2005 9.83 to 44.54 52.1 (16.0 to 99.4)  < 0.001
 2005 to 2010 44.54 to 36.55 − 3.0 (− 9.1 to 3.4) 0.300
 2010 to 2018 36.55 to 19.06 − 9.8 (− 11.3 to − 8.3)  < 0.001
  1. The bold indicated that the changes were significant
  2. *The number of newly smear-positive TB cases (per 100 000) at the first and the last year of indicated segment
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