. 2021 Oct 30;21:1962. doi: 10.1186/s12889-021-11949-5

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

Effect type	Specification	Statistic	Variable
Effect type	Specification	Statistic	Temperature	Rainfall	NDVI
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

Peak month is the month corresponding to the highest IRR of malaria

^astatistically significant

IRR Incidence risk ratio

NDVI Normalized difference vegetation index