Table 4 DLNM model results for separate and cumulative effects of environmental variables on the RR of malaria burden in high transmission settings of Uganda

Separate effect

Low

Variable value

26

3

0.24

Peak month

4

4

2

IRR at peak month

1.22 (0.68–2.16)

4.05 (1.40–11.54)^a

1.80 (0.35–9.43)

High

Variable value

35

200

0.72

Peak month

2

0

2

IRR at peak month

2.00 (1.42–2.83)^a

1.24 (1.01–1.52)^a

1.31 (1.04–1.65)^a

Cumulative effect

Month lag 1

Variable value

26

3

0.24

IRR

0.69 (0.31–1.62)

2.52 (0.72–8.56)

0.44 (0.08–2.36)

Variable value

35

200

0.72

IRR

2.19 (1.21–3.89)^a

1.50 (1.12–2.00)^a

1.09 (0.87–1.38)

Month lag 2

Variable value

26

3

0.24

IRR

0.43 (0.14–1.42)

3.16 (0.57–17.41)

0.79 (0.13–4.78)

Variable value

35

200

0.72

IRR

4.39 (2.09–9.21)^a

1.87 (1.31–2.69)^a

1.42 (1.06–1.89)^a

Month lag 3

Variable value

26

3

0.24

IRR

0.36 (0.10–1.55)

6.73 (0.64–68.29)

0.54 (0.06–4.68)

Variable value

35

200

0.72

IRR

8.08 (3.41–20.26)^a

1.95 (1.28–2.97)^a

1.42 (1.04–1.95)^a

Month lag 4

Variable value

26

3

0.24

IRR

0.44 (0.10–2.19)

26.70 (1.82–397.00)^a

0.83 (0.09–7.18)

Variable value

35

200

0.72

IRR

8.16 (3.41–20.26)^a

1.99 (1.22–2.27)^a

1.57 (1.09–2.25)^a