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Table 7 The average number of Anopheles funestus collected per collection-night (HLC)

From: Reduced exposure to malaria vectors following indoor residual spraying of pirimiphos-methyl in a high-burden district of rural Mozambique with high ownership of long-lasting insecticidal nets: entomological surveillance results from a cluster-randomized trial

Month

Average number of mosquitoes collected per collection-night (95% CI)

IRRa

pb

No-IRS

IRS

Sep-16

0.70 (0.03–1.81)

1.33 (0.01–4.37)

3.96

0.021

Oct-16

0.10 (0.00–0.34)

0.21 (0.00–0.65)

1.25

< 0.001

Nov-16

0.14 (0.00–0.54)

0.16 (0.00–0.61)

1.25

< 0.001

Dec-16

0.19 (0.00–0.45)

0.32 (0.00–0.92)

2.67

< 0.001

Jan-17

–

–

–

–

Feb-17

–

–

–

–

Mar-17

1.79 (0.42–4.47)

0.12 (0.00–0.33)

0.16

0.002

Apr-17

4.19 (0.55–16.35)

1.08 (0.13–2.80)

0.17

0.046

May-17

3.81 (0.16–19.03)

1.18 (0.00–3.82)

0.15

0.018

Jun-17

2.65 (0.02–12.06)

0.00 (0.00–0.00)

NR

NR

Jul-17

2.71 (0.05–12.18)

0.48 (0.00–1.35)

0.05

< 0.001

Aug-17

1.26 (0.04–3.92)

0.42 (0.00–1.22)

0.33

< 0.001

Sep-17

0.41 (0.00–1.33)

0.29 (0.00–0.74)

0.08

< 0.001

Oct-17

0.48 (0.00–1.45)

0.00 (0.00–0.00)

NR

NR

Nov-17

0.18 (0.00–0.68)

0.00 (0.00–0.00)

NR

NR

Dec-17

0.68 (0.00–1.87)

0.43 (0.07–0.91)

0.31

< 0.001

Jan-18

1.74 (0.23–5.09)

0.38 (0.00–1.10)

0.32

0.007

Feb-18

0.97 (0.15–2.38)

1.76 (0.61–3.74)

1.17

0.824

Mar-18

2.01 (0.52–4.97)

0.55 (0.06–1.28)

0.39

0.071

Apr-18

–

–

–

–

May-18

1.79 (0.24–5.29)

0.30 (0.00–0.79)

0.19

0.022

Jun-18

2.01 (0.21–6.49)

0.28 (0.00–0.86)

0.25

0.007

Jul-18

0.69 (0.00–1.97)

0.48 (0.00–1.26)

0.52

0.080

Aug-18

0.69 (0.00–2.16)

0.26 (0.00–0.86)

0.50

< 0.001

Sep-18

1.22 (0.00–4.56)

0.14 (0.00–0.54)

0.16

< 0.001

Oct-18

0.91 (0.00–3.13)

0.30 (0.00–0.97)

0.40

< 0.001

Overallc

1.10 (0.82–1.43)

0.43 (0.31–0.56)

0.26

0.010

  1. The geometric mean number (with 95% CI) of mosquitoes by month are presented. Months highlighted in italics show the duration of the IRS campaigns
  2. HLC human landing collection, IRR incidence rate ratio, IRS indoor residual spraying
  3. aThe incidence ratio describing the rate at which mosquitoes were collected in IRS villages relative to no-IRS villages. An IRR = 1 indicates no difference across study arms
  4. bThe probability that the true IRR = 1; zero-inflated negative binomial regression
  5. cOverall averages from the duration of the study after the first IRS campaign, December 2016–October 2018