Comparison between passive surveillance and active surveillance during follow up from May 2007 to May 2008 in a subset of children aged 5–17months.

* = The active surveillance package consisted of passive surveillance at dispensary, passive surveillance at community by trained field worker with supervision from study clinician and active weekly surveillance by trained field workers.θ = Clinical malaria defined as fever (axillary temperature≥37.5°C plus parasitaemia of any density.# = Passive surveillance package consisted of Passive surveillance at dispensary only. Numbers in brackets are 95% confidence interval unless indicated otherwise.