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Table 3 Clusters of indigenous and imported malaria cases in Hubei Province, 2005–2016

From: Epidemiological characteristics of malaria from control to elimination in Hubei Province, China, 2005–2016

Phase

Infection source

Type of cluster

No. counties

Radius (km)

Time frame

Number of cases

Expected cases

Relative risk

Log likelihood ratio

P value

2005–2010

Indigenous

A

13

119.54

2005/4/1 to 2007/11/30

4273

532.72

18.58

6510.03

0.000

 

Imported

A

1

0

2007/9/1 to 2007/9/30

24

0.026

1071.73

141.41

0.000

  

B_1

1

0

2008/4/1 to 2008/4/30

5

0.022

233.49

22.21

0.000

  

B_2

3

38.06

2010/6/1 to 2010/8/31

7

0.12

61.33

21.77

0.000

  

B_3

1

0

2008/6/1 to 2010/11/30

11

0.63

18.84

21.52

0.000

2011–2016

Indigenous

A

11

116.4

2011/1/1 to 2011/9/30

68

4.95

54.99

149.05

0.000

 

Imported

A

6

16.43

2012/8/1 to 2015/7/31

159

32.66

5.91

137.17

0.000

  

B_1

1

0

2012/6/1 to 2015/5/31

40

3.31

12.71

63.90

0.000

  

B_2

1

0

2012/3/1 to 2014/4/30

13

1.68

7.83

15.33

0.007

  

B_3

1

0

2014/12/1 to 2015/1/31

5

0.12

43.56

13.97

0.022

  1. A: Most likely cluster; B: Secondary cluster