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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