Table 7. Risk factors for ≥ 2 episodes of malaria infection.

	Poisson model		Multilevel Poisson model (random intercept for regions)
	IRR*	p value	IRR*	p value
Age groups
< 4.9years	1		1
5–14.9years	1.42 (1.31–1.53)	<0.01	1.39 (1.21–1.59)	< 0.01
15–29.9years	1.01 (0.85–1.21)	0.9	0.89 (0.76–1.06)	0.21
≥30years	0.73 (0.58–0.91)	0.01	0.75 (0.63–0.89)	0.002
Gender
Males	1		1
Females	0.81 (0.75–0.88)	< 0.01	0.87 (0.78–0.97)	0.02
Hb
Normal	1		1
Mild anaemia	1.16 (1.05–1.28)	0.004	1.12 (0.98–1.29)	0.09
Moderate anaemia	1.01 (0.90–1.13)	0.84	1.02 (0.87–1.19)	0.85
Severe anaemia	1.12 (0.76–1.64)	0.58	0.90 (0.64–1.28)	0.57
LLIN ownership
No	1		1
Yes	0.62 (0.42–0.91)	0.01	0.84 (0.74–0.94)	0.003
Sleep outdoors
No	1		1
Yes	1.28 (0.94–1.74)	0.12	1.02 (0.83–1.24)	0.88
Travelled outside the village
No	1		1
Yes	1.33 (0.9–1.89)	0.10	0.92 (0.75–1.14)	0.46

*IRR: Incidence Rate Ratio