Table 4. Incidence density of malaria episode according to season and different level of parsitemia.

Stratum	Number of observations	Number of children having at least one episode (>0 parasites/µl)	Incidence rate per year at risk >0 parasite/µL	Incidence rate per year at risk >2500 parasite/µL	Incidence rate per year at risk >5000 parasite/µL
Active cohort	55279	480	2.4 (2.2, 2.5)	1.8 (1.7, 1.9)	1.6 (1.5, 1.7)
Passive cohort	5742	702	1.3 (1.2, 1.3)	0.9 (0.9, 1.0)	0.8 (0.8, 0.9)
Active cohort high season	22013	424	3.9 (3.6, 4.2)	3.2 (2.9, 3.4)	2.9 (2.7, 3.2)
Passive cohort high season	1824	585	2.2 (2.1, 2.4)	1.8 (1.6, 1.9)	1.6 (1.5, 1.7)
Active cohort low season	33266	304	1.4 (1.3, 1.6)	0.9 (0.8, 1.0)	0.8 (0.7, 0.9)
Passive cohort low season	3918	323	0.7 (0.6, 0.7)	0.4 (0.4, 0.5)	0.3 (0.3, 0.4)