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Table 2 Correlation (r = 0.681, P < 0.001) between rainfall and female Anopheles density in the study area. Square root transformation formula X1= √X+0.5, where X1 is the transformed value and X is the actual value

From: Mind the weather: a report on inter-annual variations in entomological data within a rural community under insecticide-treated wall lining installation in Kwara State, Nigeria

Month

Anopheles density

Actual values in intervention site

Transformed values in intervention site

Actual values in control site

Transformed values in control site

Total Anopheles densities in both sites

Rainfall (mm)

First year

 October 2012

8

2.92

36

6.04

8.96

12.42

 November 2012

17

4.18

58

7.65

11.83

3.03

 December 2012

1

1.22

33

5.79

7.01

5.07

 January 2013

0

0.71

45

6.75

7.46

2.30

 February 2013

0

0.71

37

6.12

6.83

2.45

 March 2013

2

1.58

30

5.52

7.10

6.24

 April 2013

35

5.96

53

7.31

13.27

14.96

 May 2013

12

3.54

40

6.36

9.90

11.05

 June 2013

8

2.92

20

4.53

7.45

12.20

 July 2013

8

2.92

26

5.15

8.07

10.54

 August 2013

1

1.22

21

4.64

5.86

7.20

 September 2013

36

6.04

109

10.46

16.50

16.34

 Total

128

33.92

508

76.32

110.24

103.80

Second year

 October 2013

86

9.30

88

9.41

18.71

17.59

 November 2013

2

1.58

52

7.25

8.83

0.71

 December 2013

0

0.71

57

7.58

8.29

2.70

 January 2014

1

1.22

53

7.31

8.53

3.19

 February 2014

0

0.71

45

6.75

7.46

5.39

 March 2014

6

2.55

51

7.18

9.73

7.26

 April 2014

78

8.86

117

10.84

19.70

20.23

 May 2014

36

6.04

56

7.52

13.56

15.26

 June 2014

9

3.08

21

4.64

7.72

17.48

 July 2014

7

2.74

20

4.53

7.27

18.24

 August 2014

24

4.95

61

7.84

12.79

15.03

 September 2014

80

8.97

171

13.09

22.06

22.63

 Total

329

50.71

792

93.94

144.65

145.71