Do socio-demographic factors modify the effect of weather on malaria in Kanungu District, Uganda?

Malaria Journal

Table 6 Incidence rate ratio (IRR) interaction model results, including sociodemographic variables as effect modifiers

	Interaction model, results by temperature quartile
	Quartile 1–3 (cool) IRR (95% CI) p-value	Quartile 4 (hot) IRR (95% CI) p-value	IRR hot/IRR cool within strata of ethnicity, sex, age, and season Ratio of Ratios (ROR)
Bakiga	Referent	Referent	Referent
Batwa	0.82 (0.34, 1.99) 0.67	1.63 (0.64, 4.16) 0.31	1.99
Male	Referent	Referent	Referent
Female	1.02 (0.86, 1.22) 0.81	2.02 (1.03, 3.09) 0.001	1.98
0–5 years old	Referent	Referent	Referent
6–12 years old	0.96 (0.74, 1.24) 0.75	1.90 (1.31, 2.74) 0.001	1.98
13–18 years old	0.92 (0.64, 1.33) 0.65	1.82 (1.19, 2.77) 0.01	1.98
19–55 years old	0.96 (0.72, 1.29) 0.78	1.90 (1.32, 2.73) 0.001	1.98
55 + years old	1.43 (0.57, 3.59) 0.44	2.83 (1.05, 7.67) 0.04	1.98
Season (wet)	Referent	Referent	Referent
Season (dry)	0.23 (0.10, 0.51) < 0.001	0.45 (0.20, 0.99) 0.047	1.96

Interpretation for ethnicity: the Batwa weekly malaria hospital admission incidence rate was 1.63 times the rate of admission for Bakiga during the lagged hot temperatures. The ratio of ratios for Batwa vs Bakiga in the hot quartile over the cool quartiles was 1.99
*Bold indicates a p-value of < 0.05

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