Table 2 Seasonal entomological indices for Anopheles arabiensis, pre- and post-onset of intervention. Entomological indices include incidence rate ratios (IRR) of the daily human-biting (HBR) and sporozoite (SR) and the daily entomological inoculation rates (EIR) of the intervention and control villages in each transmission season. The control village was used as the reference category

Pre-intervention

Long rains

HBR

Control

8.5 (− 0.7–17)

Intervention

4.8 (2.4–7.4)

0.6

0.04

SR

Control

0.02 (− 0.006–0.04)

Intervention

0.02 (− 0.01–0.06)

1.1

0.96

EIR

Control

0.2 (− 0.1–0.5)

Intervention

0.1 (− 0.06–0.3)

0.6

0.76

Short rains

HBR

Control

5.6 (− 4.34–15.48)

Intervention

2.1 (− 0.23–4.41)

0.4

0.07

SR

Control

0.01 (− 0.014–0.04)

Intervention

0.02 (− 0.02–0.07)

1.9

0.94

EIR

Control

0.07 (− 0.06–0.17)

Intervention

0.05 (− 0.1–0.25)

0.7

0.81

Intervention

Long rains

HBR

Control

10.5 (− 0.46–21.48)

Intervention

3.03 (1.42–4.63)

0.3

< 0.0001

SR

Control

0.02 (− 0.002–0.02)

Intervention

0.01 (− 0.004–0.02)

0.5

0.93

EIR

Control

0.2 (− 0.05–0.4)

Intervention

0.02 (− 0.01–0.06)

0.1

0.5

Short rains

HBR

Control

5.2 (− 0.78–11.23)

Intervention

1.6 (0.36–0.50)

0.3

0.01

SR

Control

0.03 (− 0.02–0.07)

Intervention

0.01 (− 0.01–0.02)

0.3

0.82

EIR

Control

0.2 (− 0.1–0.5)

Intervention

0.01 (− 0.03–0.1)

0.5

0.5