Plasmodium falciparum parasitaemia and clinical malaria among school children living in a high transmission setting in western Kenya

Table 2 Plasmodium falciparum infection and incidence of clinical malaria, by sex among school children during the 15 months follow-up

Outcome	Events	Total tests	Prevalence	Events	Total tests	Prevalence	Prevalence ratio (95 % CI)	P value^a
Outcome	Boys			Girls			Prevalence ratio (95 % CI)	P value^a
Plasmodium falciparum infection
All events	2388	5362	0.45	1884	4853	0.39	0.87 (0.83–0.92)	<0.001
Events in dry season	2237	967	0.43	2036	770	0.38	0.87 (0.82–0.93)	<0.001
Events in wet season	3125	1421	0.45	2817	1114	0.40	0.87 (0.81–0.94)	<0.001

Outcome	Episodes	PYAR	Incidence	Episodes	PYAR	Incidence	IRR (95 % CI)	P value
Outcome	Boys			Girls			IRR (95 % CI)	P value
Clinical malaria
All episodes	277	1218.9	0.23	329	1091.8	0.31	1.33 (1.11–1.59)	0.001
Episodes in dry season	107	659.0	0.16	139	589.6	0.23	1.45 (1.12–1.88)	0.005
Episodes in wet season	170	502.2	0.30	190	560.0	0.38	1.24 (1.01–1.53)	0.036
Parasite density >2500/μL	65	1199.6	0.05	65	1068.9	0.06	1.12 (0.78–1.62)	0.225

PYAR person years at risk, IRR incidence rate ratio, CI confidence interval, μL microlitre
^aP values based on Wald test comparing the difference between boys and girls

ISSN: 1475-2875