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Table 1 Rainfall recorded in the area during the study period. 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

Period First year Second year
Actual values Transformed values Actual values Transformed values
Dry season
 October 153.7 12.42 308.8 17.59
 November 8.7 3.03 0.0 0.71
 December 25.2 5.07 6.8 2.70
 January 4.8 2.30 9.7 3.19
 February 5.5 2.45 28.6 5.39
 March 38.4 6.24 52.2 7.26
 Mean ± SD   5.25 ± 3.84   6.14 ± 6.05
Wet season
 April 223.4 14.96 408.8 20.23
 May 121.7 11.05 232.3 15.26
 June 148.4 12.20 305.2 17.48
 July 110.6 10.54 332.3 18.24
 August 51.4 7.20 225.3 15.03
 September 266.5 16.34 511.7 22.63
 Mean ± SD   12.05 ± 3.28   18.15 ± 2.93
 Annual mean ± SD   8.65 ± 4.92   12.14 ± 7.74
  1. The difference between first and second year mean rainfall values was significant in the wet (P < 0.001) but not in the dry (P = 0.494) season. Annual mean rainfall value was significantly (P = 0.005) higher in the second year compared to the first year