Figure 4
Estimated proportions of exposure to biting An. gambiae occurring indoors (Ï€i ; equation 7) and during peak sleeping hours (Ï€s ; equation 6)for non-users of ITNs as well as the estimated true protective efficacy of ITNs (P*; equation 5), for ITN users at two sites in the Kilombero Valley in 1997 and 2004 [see Additional file 1].