Table 3.

Comparison of clinical malaria incidence rates by age-group and year

Incidence rate of clinical malaria by age-group in 2017–18
	6 months–5 years	6–10 years	> 10 years	Overall	IRR* (95% CI), P	IRR† (95% CI), P
Number of episodes	19	67	81	167	0.6 (0.4–1.0), 0.016	0.51 (0.3–0.9), 0.005
Person-year	64.8	133.2	141.3	339.3
Incidence rate (95% CI)	0.3 (0.2–0.5)	0.5 (0.4–0.6)	0.6 (0.5–0.7)	0.5 (0.4–0.6)
Comparison of malaria incidence in children aged up to 5 years in 2012 and 2017–2018
	2012	2017–2018	IRR‡ (95% CI), P
Number of episodes	185	19	6.7 (4.2–11.4), < 10−3
Person-year	94.2	64.8
Incidence rate (95% CI)	2.0 (1.7–2.3)	0.3 (0.2–0.5)
Comparison of malaria incidence in children aged up to 5 years in 1999 and 2017–2018
	1999	2017–2018	IRR§ (95% CI), P
Number of episodes	245	19	13.5 (8.4–22.7), < 10−3
Person-year	62.1	64.8
Incidence rate (95% CI)	3.9 (3.5–4.5)	0.3 (0.2–0.5)

IRR = incidence rate ratio.

^*IRR = comparison of malaria incidence in children aged up to 5 years and children older than 10 years in 2017–2018.

^†IRR = comparison of malaria incidence in children aged up to 5 years and children aged from 6 to 10 years in 2017–2018.

^‡IRR = comparison of malaria incidence in children aged up to 5 years in 2012 and 2017–2018.

^§IRR = comparison of malaria incidence in children aged up to 5 years in 1999 and 2017–2018.