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Table 3 Spatial cluster analysis in Shandong Province, 2005–2015

From: Malaria control and prevention towards elimination: data from an eleven-year surveillance in Shandong Province, China

Phase Infection source Code No. of counties Proposed cluster timeframe No. of cases Expected cases Population (10,000) RR p
Control Indigenous a 13 Jan. 1 of 2006 to Dec. 31 of 2007 126 18.80 2165.7 9.78 <0.001
b 1 Jan. 1 of 2008 to Dec. 31 of 2008 5 0.20 44.9 25.90 0.013
c 1 Jan. 1 of 2005 to Dec. 31 of 2005 6 1.10 254.3 5.51 0.698
Imported d 2 Jan. 1 of 2005 to Dec. 31 of 2005 15 0.62 133.0 25.17 <0.001
e 14 Jan. 1 of 2005 to Dec. 31 of 2005 20 9.29 1994.4 2.22 0.856
f 1 Jan. 1 of 2008 to Dec. 31 of 2009 28 7.55 809.9 3.92 <0.001
g 4 Jan. 1 of 2007 to Dec. 31 of 2007 15 3.91 840.2 3.95 0.037
h 5 Jan. 1 of 2008 to Dec. 31 of 2009 45 4.49 481.1 11.23 <0.001
Elimination Indigenous i 1 Jan. 1 of 2010 to Dec. 31 of 2011 37 0.14 120.2 801.58 <0.001
j 1 Jan. 1 of 2010 to Dec. 31 of 2011 4 0.46 411.7 9.19 0.732
Imported k 17 Jan. 1 of 2013 to Dec. 31 of 2015 236 68.53 2970.6 4.54 <0.001
l 1 Jan. 1 of 2013 to Dec. 31 of 2015 17 2.48 107.5 6.99 <0.001
m 11 Jan. 1 of 2013 to Dec. 31 of 2015 113 33.54 1453.7 3.78 <0.001