Table 4

Comparison of mean human biting rates (HBR) of An. gambiae s.l. and Culex sp. and entomological inoculation rate (EIR) for An. gambiae s.l. in the intervention and non-intervention wards during baseline and first year of intervention. 95% confidence intervals in parenthesis.

Pre-Intervention^a

First intervention year ^b

Percentage Reduction

Non-Intervention Wards

Intervention Wards

p^c

Non-Intervention Wards

Intervention Wards

p

Annual mean

Daily HBR An. gambiae

0.93 (0.60–1.46)

0.72 (0.51–1.02)

0.367

0.94 (0.57–1.56)

0.50 (0.38–0.68)

0.040

31.3%

Annual EIR An. gambiae

1.05 (0.68–1.65)

0.81 (0.58–1.15)

1.06 (0.64–1.77)

0.56 (0.43–0.77)

Daily HBR Culex sp.

173.9 (140.7–214.9)

86.8 (72.7–103.7)

<0.001

171.5 (137.2–214.3)

86.1 (70.9–104.4)

<0.001

0%

Dry season mean (July-August-September)

Daily HBR An. gambiae

0.59 (0.32–1.11)

0.46 (0.29–0.72)

0.505

1.17 (0.56–2.47)

0.12 (0.08–0.20)

<0.001

86.8%

EIR An. gambiae

0.67 (0.36–1.26)

0.52 (0.33–0.81)

1.32 (0.63–2.79)

0.14 (0.09–0.22)

Daily HBR Culex sp.

196.3 (157.9–244.0)

98.4 (82.2–117.9)

<0.001

151.1 (125.3–192.0)

86.1 (67.1–110.6)

<0.001

0%

^a April 2005 – March 2006; March 2006 has been included in the calculation for the baseline year since reductions of adult mosquitoes due to larviciding cannot be expected earlier than 3–4 weeks into the intervention [36].

^b April 2006 – March 2007.

^c Generalized estimating equations (GEE) were used to analyse pre-intervention data and data from the first year of intervention, respectively. In each analyses mean densities are compared between non-intervention and intervention sites. Ten-cell units were used as a subject unit, log linked mosquito densities and intervention and non-intervention areas as the factor.

Fillinger et al. Malaria Journal 2008 7:20   doi:10.1186/1475-2875-7-20