Table 2.

Malaria parasitemia incidence among collectors and non-collectors and the hazard ratio estimated from a Cox proportional hazards model, western Kenya

Group	Events	Person-years at risk	Rate per person-year	Hazard ratio	P
Collectors	5	35.0	0.14	0.034	< 0.0001
Non-collectors	32	28.3	1.13	Referent	Referent