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Table 4 Mean indoor resting density per house of all Anopheles in valleys and hill tops of intervention (I) and control (C) areas. Differences by survey were tested with the negative binomial regression.

From: Spatial targeted vector control in the highlands of Burundi and its impact on malaria transmission

  Valleys Hill tops
Survey C I* Density ratio (95% CI) P value C I* Density ratio (95% CI) P value
2 3.26 0.13 0.04 (0.01–0.13) <0.001 1.03 0.39 0.37 (0.13–1.05) 0.061
3 1.81 0.27 0.15 (0.06–0.40) <0.001 0.34 0.74 2.20 (0.87–5.58) 0.096
4 1.87 0.18 0.09 (0.03–0.26) <0.001 0.65 0.32 0.49 (0.23–1.02) 0.055
5 7.12 0.52 0.07 (0.03–0.16) <0.001 3.36 0.90 0.27 (0.12–0.61) 0.002
6 2.51 0.27 0.11 (0.02–0.70) 0.020 0.76 0.18 0.24 (0.09–0.64) 0.004
7 8.70 3.44 0.40 (0.16–0.95) 0.039 2.18 3.39 1.56 (0.56–4.30) 0.392
8 11.80 1.19 0.10 (0.03–0.32) <0.001 3.13 1.76 0.56 (0.15–2.07) 0.386
9 3.58 1.15 0.32 (0.15–0.70) 0.004 1.53 1.73 1.13 (0.34–3.84) 0.839
  1. *Areas initially selected as intervention and not sprayed during the first year were not included in the analysis of survey 2 and 3.
  2. Odd surveys: April–May, 9 months after the annual IRS round
  3. Even surveys: November–December, 3 months after the annual IRS round