Table 2.

Temporal clustering of notified pulmonary tuberculosis cases from 2010 to 2019 in Shenzhen municipality, China.

Year	Cluster time frame	Observed cases	Expected cases	RRa	LLRb	P valuec
2010	March 1 to May 31	2136	1696.58	1.38	72.30	<.001
2011	July 1 to September 30	1642	1469.98	1.16	13.13	<.001
2012	February 1 to April 30	1500	1286.07	1.23	22.79	<.001
2013	April 1 to June 30	1430	1185.74	1.29	32.14	<.001
2014	June 1 to August 31	1600	1344.21	1.27	31.31	<.001
2015	April 1 to June 30	1714	1428.82	1.28	36.40	<.001
2016	April 1 to June 30	1693	1418.70	1.27	33.92	<.001
2017	July 1 to August 31	1458	1186.66	1.29	35.34	<.001
2018	March 1 to May 31	1766	1517.62	1.23	26.28	<.001
2019	June 1 to August 31	1698	1460.91	1.23	24.88	<.001
2010-2019	March 1 to September 30, 2010	4562	3072.58	1.53	334.01	<.001

^aRR: relative risk.

^bLLR: log likelihood ratio.

^cConsidered significant at P<.05 (two-tailed).