Table 2.

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

	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

The bold indicated that the changes were significant

*The number of newly smear-positive TB cases (per 100 000) at the first and the last year of indicated segment