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Table 2 Clusters of dengue fever by all, indigenous and imported cases in Guangdong province, China, 2005-2010

From: Spatiotemporal analysis of indigenous and imported dengue fever cases in Guangdong province, China

Type of cluster No. counties in the cluster Radius (km) Duration Population Relative risk Log likelihood ratio P-value
With a maximum spatial cluster size of ≤50% of total population   
1. all cases   
M* 11 50.43 2006/8-2006/11 10,394,229 135.18 2688.65 <0.001
S 1 0 2006/9-2006/10 862,662 429.69 886.44 <0.001
2. indigenous cases     
M* 11 50.43 2006/8-2006/11 10,394,229 153.56 2760.44 <0.001
S 1 0 2006/9-2006/10 862,662 471.25 902.08 <0.001
3. imported cases     
M* 26 89.80 2008/4-2010/12 32,795,835 7.52 44.66 <0.001
With a maximum spatial cluster size of ≤10% of total population   
1. all cases
same to that with a maximum spatial cluster size of ≤50% of total population
2. indigenous cases
same to that with a maximum spatial cluster size of ≤50% of total population
3. imported cases     
M* 6 27.00 2008/4-2010/10 7,608,517 10.95 36.19 <0.001
S 6 19.47 2007/4-2007/11 6,013,893 13.81 13.27 0.02
S 3 39.40 2007/10 1,342,186 162.28 12.24 0.03
  1. *M: the most likely cluster.
  2. † S: the secondary cluster.
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