Table 1. Episodes per child/year showing continuity of being ‘more susceptible’ over time.

Age*	Group	Year 1	Year 2	Year 3	Year 4	Year 5
Under 2	Normal	0.8	0.7	0.8	0.3	0.6
	M. susceptible	2.3	2.7	4.4	1.0	1.6
2–4 yrs	Normal	0.9	0.4	0.8	0.2	0.5
	M. susceptible	2.8	2.3	3.2	0.6	1.9
≥5 yrs (ALL)	Normal	0.6	0.4	0.4	End of follow-up
	M. susceptible	2.6	1.6	2.2	for these children

Note:

^*Age in years at the start of the study

Year 1 = September 1998 to September 1999

Year 2 = October 1999 to October 2000

Year 3 = October 2000 to November 2001

Year 4 = November 2001 to November 2002

Year 5 = December 2002 to September 2003.

M. susceptible = ‘more susceptible’. These are the children who experienced >2 episodes of clinical malaria above the total predicted from the Poisson regression model.