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Table 2 Stratified analysis of vector density (density ratio) by seasonality and intervention period

From: Impact of seasonality and malaria control interventions on Anopheles density and species composition from three areas of Uganda with differing malaria endemicity

Study
site
Variable Categories An. gambiae s.s An. arabiensis An. funestus
Vector density DR (95% CI) p-value Vector density DR (95% CI) p-value Vector density DR (95% CI) p-value
Walukuba1 Seasonality Dry seasonsa 0.16 Reference   0.22 Reference   0.02 Reference  
Rainy seasonsb 0.49 3.21 (2.15–4.79)  < 0.001 0.67 2.84 (1.87–4.32)  < 0.001 0.06 2.57 (1.36–4.88) 0.004
Intervention
Period
Before LLINsc 0.34 Reference   0.58 Reference   0.07 Reference  
After LLINsd 0.33 1.29 (0.86–1.93) 0.21 0.35 0.85 (0.56–1.30) 0.45 0.02 0.34 (0.18–0.65) 0.001
Kihiihi2 Seasonality Dry seasonse 0.78 Reference   Insufficient number of An. arabiensis collected Insufficient number of An. funestus s.l collected
Rainy seasonsf 4.50 5.56 (3.90–7.92)  < 0.001
Intervention
Period
Before LLINsg 4.00 Reference   Insufficient number of An. arabiensis collected Insufficient number of An. funestus s.l collected
After LLINsh 2.46 0.68 (0.49–0.94) 0.02
Nagongera3 Seasonality Dry seasonsi 2.92 Reference   1.54 Reference   2.24 Reference  
Rainy seasonsj 25.4 12.2 (7.05–21.3)  < 0.001 9.06 7.75 (4.21–14.3)  < 0.001 2.70 1.61 (0.97–2.66) 0.06
Intervention
Period
Before LLINsk 28.0 Reference   9.18 Reference   3.90 Reference  
After LLINsl 11.2 0.40 (0.21–0.73)  < 0.003 3.65 0.36 (0.18–0.72) 0.004 2.56 0.61 (0.36–1.04) 0.07
After 1st Round of IRSm 2.71 0.05 (0.02–0.16)  < 0.001 5.44 0.33 (0.10–1.09) 0.07 0.10 0.02 (0.008–0.06)  < 0.001
After 2nd Round of IRSn 0.17 0.004 (0.002–0.009)  < 0.001 2.00 0.15 (0.07–0.33)  < 0.001 0.006 0.001 (0.0005–0.004)  < 0.001
  1. 1Low malaria transmission
  2. 2Moderate malaria transmission
  3. 3High malaria transmission
  4. a February–April, July–September
  5. b May–June, October–January
  6. c Oct 2011–Nov 2013
  7. d Dec 2013–June 2016
  8. e January–February, July–August
  9. f March–June, September–December
  10. g Oct 2011–June 2014
  11. h July 2014–June 2016
  12. i January-March, August–September
  13. j April-July, October–December
  14. k Oct 2011–Nov 2013
  15. l Dec 2013–Feb 2015
  16. m March 2015–June 2015
  17. n July 2015–June 2016