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Table 3 Temporal-spatial scan results of overseas imported dengue fever, 2005–2019

From: Epidemiological characteristics and temporal-spatial analysis of overseas imported dengue fever cases in outbreak provinces of China, 2005–2019

Period

Cluster

Aggregation time

No. of observed cases

No. of expected cases

Relative risk

LLR

P value

2005–2012

I

2008/8/1–2008/11/30

46

0.04

1,321.4

282.7

 < 0.01

II

2010/7/1–2012/12/31

223

66.4

4.8

140.4

 < 0.01

2013–2019

I

2014/8/1–2017/12/31

1,986

8.6

282.1

9,019.8

 < 0.01

II

2019/5/1–2019/11/30

3,266

463.8

9.7

3,991.1

 < 0.01

  1. LLR: The log-likelihood ratio can be used to identify the locations of the most likely clusters and secondary clusters and other clustering regions.