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Table 1 Findings from entomological surveys performed in 52 storm drains, before and after an intervention to prevent water accumulation in Salvador, Brazil

From: Effect of an intervention in storm drains to prevent Aedes aegypti reproduction in Salvador, Brazil

Survey characteristics Pre-intervention (Year: 2015) Post-intervention (Year: 2016) P a
  First survey Second survey Total First survey Second survey Total
Survey date (day/month) 10 & 13/Mar 28 & 29/Mar Mar 21/Apr 21/May Apr-May  
Average precipitation (mm) during 7 days prior to survey 2.7 60.3 31.5 23.2 66.4 44.8 < 0.001
No. (%) of storm drain with accumulated water 38 (73.1) 48 (92.3) 48 (92.3) 2 (3.9) 4 (7.7) 5 (9.6) < 0.001
Average volume (l) of water 32.2 51.0 41.6 0.45 2.7 1.6 0.043
No. (%) of storm drain containing larvae/pupae of
Aedes aegypti 11 (21.2) 1 (1.9) 11 (21.2) 0 (0) 0 (0) 0 (0) < 0.001
 Non-Aedes mosquitoes 19 (36.5) 2 (3.8) 19 (36.5) 0 (0) 1 (1.9) 1 (1.9) < 0.001
No. (%) of storm drain containing adults of
Aedes aegypti 8 (15.4) 2 (3.8) 10 (19.2) 3 (5.8) 0 (0) 3 (5.8) 0.039
Aedes albopictus 0 (0) 0 (0) 0 (0) 1 (1.9) 0 (0) 1 (1.9) 1.00
 Non-Aedes mosquitoes 12 (23.1) 8 (15.4) 13 (25.0) 2 (3.8) 0 (0) 2 (3.8) < 0.001
Number of larvae/pupae collected
Aedes aegypti 108 1 109 0 0 0 < 0.001
 Non-Aedes mosquitoes 161 6 167 0 42 42 < 0.001
Number of adults captured
Aedes aegypti 35 2 37 8 0 8 0.011
Aedes albopictus 0 0 0 1 0 1 0.317
 Non-Aedes mosquitoes 16 25 41 4 0 4 < 0.001
  1. Aedes albopictus larvae or pupae were not detected in any of the surveys. Non-Aedes mosquitoes were mainly Culex spp. mosquitoes
  2. a P-values for the comparison between pre- and post-intervention totals using MacNemar’s test or Wilcoxon signed-rank test