Malaria morbidity and immunity among residents of villages with different Plasmodium falciparum transmission intensity in North-Eastern Tanzania

Table 3 Logistic regression model showing the risk of developing a febrile malaria episode during the 6 month morbidity surveillance according to age and the result of the slide at the initiation of the study in Mgome

Explanatory variable	Crude odds ratio (95% Cl)	p-value	Adjusted odds ratio (95% Cl)	p-value
Low parasite density¹	0.34 (0.15–0.78)	0.011	0.22 (0.06–0.89)	0.033
High parasite density²	3.0 (1.09–8.29)	0.034	1.36 (0.27–8.82)	0.706
No parasitaemia³	1		1
Age (years)	0.66 (0.58 – 0.76)	<0.001	0.51 (0.332 – 0.772)	0.002
Age squared	0.98 (0.97 – 0.998)	0.007	1.03 (1.007–1.047)	0.007

¹Parasitaemia in April between 40 and 4999 parasites/μl ²Parasitaemia in April >4999 parasites/μl ³Slide negative in April

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