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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