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Table 3 The effect of smoke from blank coils on resting and blood feeding mosquitoes collected inside and around households

From: A crossover study to evaluate the diversion of malaria vectors in a community with incomplete coverage of spatial repellents in the Kilombero Valley, Tanzania

  Na nb GMc 95 % CI- GMd IRRe 95 % CI- IRRf P-value
Resting Anopheles arabiensis
 No coil 12 (4) 129 1.72 1.43–2.06 1
 Blank coils 42 (14) 259 1.44 1.28–1.62 0.84 0.58–1.20 0.328
Blood-fed Anopheles arabiensis        
 No coil 12 (4) 104 1.62 1.31–2.00 1
 Blank coils 42 (14) 125 1.30 1.14–1.48 0.53 0.33–0.84 0.007
Resting Anopheles funestus        
 No coil 12 (4) 51 1.11 1.02–1.20 1
 Blank coils 42 (14) 164 1.25 1.16–1.36 1.10 0.71–1.73 0.665
Blood-fed Anopheles funestus        
 No coil 12 (4) 37 1.10 1.00–1.22 1
 Blank coils 42 (14) 59 1.16 1.10–1.27 0.56 0.34–0.95 0.031
Resting Culex spp.        
 No coil 12 (4) 1045 3.17 2.83–3.55 1
 Blank coils 42 (14) 3209 3.13 2.91–3.36 0.90 0.68–1.19 0.453
Blood-fed Culex spp.        
 No coil 12 (4) 322 2.20 1.87–2.58 1
 Blank coils 42 (14) 134 1.35 1.20–1.53 0.16 0.10–0.24 < 0.0001
  1. aN, number of nights assigned to each type of no coverage scenario (number of weeks)
  2. bn, total number of collected resting mosquitoes
  3. cGM, geometric mean number of collected resting mosquitoes
  4. d95 % CI-GMd, 95 % confidence interval of GM
  5. eIRR, Incidence Rate Ratio
  6. f95 %-IRR, 95 % confidence interval of incidence rate ratio