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Table 2 Relative rates for capturing female Anopheles gambiae s.l. stratified by district

From: Standardizing operational vector sampling techniques for measuring malaria transmission intensity: evaluation of six mosquito collection methods in western Kenya

Trapping method

Rarieda

Kisumu West

Nyando

Rachuonyo

HLC indoor

1.00*

1.00*

1.00*

1.00*

HLC outdoor

0.77 (0.63, 0.95) a

0.60 (0.32, 1.11)a

1.19 (0.94, 1.52)b

2.57 (1.62, 4.06) c

CDC light trap

0.76 (0.61, 0.96) a

2.74 (1.04, 7.23) b

0.54 (0.20, 1.42)a

0.36 (0.06, 2.14)a,b

Ifakara Tent Trap

0.48 (0.38, 0.62) a

1.94 (0.99, 3.79)b

1.65 (1.16, 2.35) b

3.08 (1.02, 9.35) b

Window exit trap

0.72 (0.41, 1.28)a,b

0.18 (0.05, 0.64) a

0.37 (0.25, 0.56) a

0.72 (0.64, 0.81) b

Pot resting trap indoor

0.02 (0.00, 0.07) a

0.00#

0.09 (0.05, 0.16) b

0.53 (0.28, 1.01)c

Pot resting trap outdoor

0.04 (0.01, 0.10) a

0.02 (0.00, 0.26) a

1.05 (0.51, 2.17)b

0.92 (0.20, 4.35)b

Box resting trap indoor

0.00#

0.00#

0.00#

0.00#

Box resting trap outdoor

0.05 (0.04, 0.06) a

0.00#

0.11 (0.10, 0.13) b

0.59 (0.18, 1.96)c

  1. Catch rate (relative to HLC indoor) and 95% confidence interval were calculated using negative binomial regression models. Within each district (column), trap catch rates statistically different from HLC indoor (p < 0.05) are indicated in bold. Across each trap type (row), different letters denote relative capture rates varying significantly (p < 0.05) between districts. All houses in Rachuonyo District were covered by two rounds of indoor residual spraying (IRS) using pyrethroid insecticides in July/August 2008 and April/May 2009. IRS was not conducted in Rarieda, Kisumu West, or Nyando districts.
  2. * Reference collection method within each district.
  3. # Trap types that captured zero females were excluded from the model for that district.