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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
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Malaria Journal

ISSN: 1475-2875

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